Journal of Power Sources最新文献_第4页

Starting electro-motor loads in battery-less off-grid photovoltaics using a super-capacitor based charge-pump 利用基于超级电容器的充电泵启动无电池离网光伏电动机负载

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235694

M.A. Bahramian , M. Ebadi , A.A. Ghadimi , M. Khalili

Starting Electromotor (EM) loads with off-grid photovoltaics (PV) is always challenging. Because their starting current makes the PV voltage fall, leading to converter instability. A practical solution is using batteries as a backup, but the repeating inrush current lowers the battery lifespan. This paper proposes an electrical charge pump based on a super-capacitor-bank (SCB) to fix the stability issue in off-grid battery-less photovoltaics. It contains an SCB connected to the DC-link of the inverter via a bi-directional DC/DC converter. The SCB is first pre-charged from the PV. Then at the moment of starting an electromotor load (EM), it supplies the DC-link capacitor with a pulse current. The main challenge here is to control the charging/discharging current of the SCB. In the proposed method, the system model is first developed by circuit analysis. Then a pre-defined charging pattern is obtained to charge the SCB from the zero to nominal voltage with a controlled current with no transient inrush. When injecting the pulse current as a charge pump (SCB discharging mode), constant duty-cycle switching for a pre-defined period is applied to ensure the converter stability in boost mode. To get the best results, a time shift is implemented between the pulse current injection and the load start-up, as a pre-charging phase. Experimental results from a 100 w system prototype running a 70 w universal motor show that a 2 Amp/200 ms pulse current, starting 50 ms before the load start-up, keeps the DC-link voltage deviation under 10 %, and no current transient is observed.

使用离网光伏（PV）启动电动马达（EM）负载总是充满挑战。因为它们的启动电流会使光伏电压下降，导致转换器不稳定。一个实用的解决方案是使用电池作为备用，但重复的浪涌电流会降低电池的使用寿命。本文提出了一种基于超级电容器组（SCB）的电荷泵，以解决离网无电池光伏发电的稳定性问题。它包含一个通过双向 DC/DC 转换器连接到逆变器直流链路的 SCB。SCB 首先由光伏电池预充电。然后在启动电动机负载（EM）时，为直流链路电容器提供脉冲电流。这里的主要挑战是如何控制 SCB 的充放电电流。在建议的方法中，首先通过电路分析建立系统模型。然后获得一个预定义的充电模式，以受控电流对 SCB 进行从零到额定电压的充电，且无瞬态浪涌。当注入脉冲电流作为充电泵时（SCB 放电模式），在预先确定的周期内采用恒定占空比开关，以确保转换器在升压模式下的稳定性。为了获得最佳效果，在脉冲电流注入和负载启动之间进行了时间转换，作为预充电阶段。运行 70 瓦通用电机的 100 瓦系统原型的实验结果表明，在负载启动前 50 毫秒开始注入 2 安培/200 毫秒的脉冲电流，可将直流链路电压偏差控制在 10 % 以下，并且不会出现瞬态电流。

{"title":"Starting electro-motor loads in battery-less off-grid photovoltaics using a super-capacitor based charge-pump","authors":"M.A. Bahramian , M. Ebadi , A.A. Ghadimi , M. Khalili","doi":"10.1016/j.jpowsour.2024.235694","DOIUrl":"10.1016/j.jpowsour.2024.235694","url":null,"abstract":"<div><div>Starting Electromotor (EM) loads with off-grid photovoltaics (PV) is always challenging. Because their starting current makes the PV voltage fall, leading to converter instability. A practical solution is using batteries as a backup, but the repeating inrush current lowers the battery lifespan. This paper proposes an electrical charge pump based on a super-capacitor-bank (SCB) to fix the stability issue in off-grid battery-less photovoltaics. It contains an SCB connected to the DC-link of the inverter via a bi-directional DC/DC converter. The SCB is first pre-charged from the PV. Then at the moment of starting an electromotor load (EM), it supplies the DC-link capacitor with a pulse current. The main challenge here is to control the charging/discharging current of the SCB. In the proposed method, the system model is first developed by circuit analysis. Then a pre-defined charging pattern is obtained to charge the SCB from the zero to nominal voltage with a controlled current with no transient inrush. When injecting the pulse current as a charge pump (SCB discharging mode), constant duty-cycle switching for a pre-defined period is applied to ensure the converter stability in boost mode. To get the best results, a time shift is implemented between the pulse current injection and the load start-up, as a pre-charging phase. Experimental results from a 100 w system prototype running a 70 w universal motor show that a 2 Amp/200 ms pulse current, starting 50 ms before the load start-up, keeps the DC-link voltage deviation under 10 %, and no current transient is observed.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"626 ","pages":"Article 235694"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spatially-confined self-assembly boron nitride nanosheet interlayer in polymer nanocomposites significantly enhances the Capacitive energy storage performance 聚合物纳米复合材料中的空间约束自组装氮化硼纳米片夹层显著提高了电容储能性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235822

Jian Wang , Yingying Zheng , Yifei Zhang , Xiang Ma , Honghong Gong , Biyun Peng , Sen Liang , Yunchuan Xie , Wenying Zhou

High-performance electrostatic capacitors are urgently needed of advanced electronic devices. Traditional nanodielectric designs, such as polyvinylidene fluoride (PVDF)-based nanocomposites with uniformly distributed nanofillers, necessitate laborious filler interface modification and yield limited energy density (U_e) and efficiency (η). Herein, boron nitride nanosheet (BNNS) intercalated polymer nanocomposites were innovatively prepared by plasma treatment and BNNS spatially-confined self-assembly techniques. The oriented dense interlayered BNNS substantially suppresses leakage current and bolsters the breakdown strength of nanocomposite films, outperforming randomly or oriented distributed BNNS systems, thus obtaining a higher U_e of ∼24.1 J/cm³. Moreover, the relaxation loss of PVDF could be effectively mitigated by polymethyl methacrylate and trace intercalated BNNS, maintaining an ultrahigh η (76 %) at 600 MV/m and greatly enhances the energy storage performance. Significantly, this newly designed nanocomposites necessitate only traces of BNNS (0.2 wt%) without filler-surface-modification. These findings afford insight into the programming and manufacture of high-performance electrostatic capacitors.

高性能静电电容器是先进电子设备的迫切需要。传统的纳米电容器设计，如基于聚偏二氟乙烯（PVDF）和均匀分布的纳米填料的纳米复合材料，需要对填料界面进行费力的改性，且能量密度（Ue）和效率（η）有限。本文通过等离子体处理和氮化硼纳米片（BNNS）空间约束自组装技术，创新性地制备了氮化硼纳米片（BNNS）插层聚合物纳米复合材料。取向致密的互层 BNNS 大大抑制了漏电流，提高了纳米复合薄膜的击穿强度，优于随机或取向分布的 BNNS 系统，从而获得了 ∼24.1 J/cm3 的较高 Ue。此外，聚甲基丙烯酸甲酯和微量插层 BNNS 还能有效缓解 PVDF 的弛豫损耗，在 600 MV/m 时保持超高 η (76%)，大大提高了储能性能。值得注意的是，这种新设计的纳米复合材料只需添加微量 BNNS（0.2 wt%），而无需进行填料表面改性。这些发现为高性能静电电容器的编程和制造提供了启示。

{"title":"Spatially-confined self-assembly boron nitride nanosheet interlayer in polymer nanocomposites significantly enhances the Capacitive energy storage performance","authors":"Jian Wang , Yingying Zheng , Yifei Zhang , Xiang Ma , Honghong Gong , Biyun Peng , Sen Liang , Yunchuan Xie , Wenying Zhou","doi":"10.1016/j.jpowsour.2024.235822","DOIUrl":"10.1016/j.jpowsour.2024.235822","url":null,"abstract":"<div><div>High-performance electrostatic capacitors are urgently needed of advanced electronic devices. Traditional nanodielectric designs, such as polyvinylidene fluoride (PVDF)-based nanocomposites with uniformly distributed nanofillers, necessitate laborious filler interface modification and yield limited energy density (<em>U</em><sub>e</sub>) and efficiency (<em>η</em>). Herein, boron nitride nanosheet (BNNS) intercalated polymer nanocomposites were innovatively prepared by plasma treatment and BNNS spatially-confined self-assembly techniques. The oriented dense interlayered BNNS substantially suppresses leakage current and bolsters the breakdown strength of nanocomposite films, outperforming randomly or oriented distributed BNNS systems, thus obtaining a higher <em>U</em><sub>e</sub> of ∼24.1 J/cm<sup>3</sup>. Moreover, the relaxation loss of PVDF could be effectively mitigated by polymethyl methacrylate and trace intercalated BNNS, maintaining an ultrahigh <em>η</em> (76 %) at 600 MV/m and greatly enhances the energy storage performance. Significantly, this newly designed nanocomposites necessitate only traces of BNNS (0.2 wt%) without filler-surface-modification. These findings afford insight into the programming and manufacture of high-performance electrostatic capacitors.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"626 ","pages":"Article 235822"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel Fe-compound incorporating porous carbon substrate promoting electrochemical performance of SiOx anodes for lithium-ion batteries 含有多孔碳基底的新型铁化合物可提高锂离子电池氧化硅阳极的电化学性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235800

Xiaolian Li , Yueling Cai , Shao Wang , Tianzhong Wang , Hao Li , Yuanhua Xia , Zihan Wang , Heguang Liu , Wenxin Lin , Jia Yu , Qianqian Li

Silicon oxide (SiO_x) shows great potential to be used in grid energy storage as the high-energy density anodes for lithium-ion batteries (LIBs) due to its low cost and high theoretical capacity. While the issues like low conductivity and volume expansion during cycles significantly decay the battery rate capability and cycle stability. To address the overall challenges, we effectively modified SiO_x hybrid structure by introducing metal incorporating porous carbon, derived from metal-organic frameworks (MOFs), denoted as Fe-C/SiO_x. The core-shell structure, coupled with the unique properties of both Fe-C and SiO_x components, offers a synergistic effect that effectively mitigates volume expansion and low conductivity problems, resulting in significant improvements in electrochemical performance. A discharge capacity of 658 mAh g⁻¹ at 100 mA g⁻¹ and an initial coulombic efficiency of 60 % are achieved. Additionally, it exhibits long-term cyclic stability with capacity of 650 mAh g⁻¹ after 300 cycles at 100 mA g⁻¹, and 337 mAh g⁻¹ after 500 cycles at 500 mA g⁻¹. The lithium ion storage mechanism investigation suggests conductive matrix of porous Fe-C primarily facilitates enhanced lithium-ion diffusion dynamics and offers pseudocapacitance to the electrode, which is crucial for practical battery applications where fast charging and discharging are required.

氧化硅（SiOx）因其低成本和高理论容量，作为锂离子电池（LIB）的高能量密度阳极，在电网储能方面显示出巨大的应用潜力。然而，低电导率和循环过程中的体积膨胀等问题严重影响了电池的速率能力和循环稳定性。为了应对这些挑战，我们通过引入金属有机框架（MOFs）中的多孔碳，有效地改进了 SiOx 混合结构，并将其命名为 Fe-C/SiOx。核壳结构加上 Fe-C 和 SiOx 成分的独特性能，产生了协同效应，有效缓解了体积膨胀和低导电率问题，从而显著提高了电化学性能。在 100 mA g-1 的条件下，放电容量达到 658 mAh g-1，初始库仑效率达到 60%。此外，它还表现出长期循环稳定性，在 100 mA g-1 条件下循环 300 次后容量达到 650 mAh g-1，在 500 mA g-1 条件下循环 500 次后容量达到 337 mAh g-1。锂离子存储机理研究表明，多孔 Fe-C 的导电基质主要有利于增强锂离子扩散动力学，并为电极提供假电容，这对于需要快速充放电的实际电池应用至关重要。

{"title":"Novel Fe-compound incorporating porous carbon substrate promoting electrochemical performance of SiOx anodes for lithium-ion batteries","authors":"Xiaolian Li , Yueling Cai , Shao Wang , Tianzhong Wang , Hao Li , Yuanhua Xia , Zihan Wang , Heguang Liu , Wenxin Lin , Jia Yu , Qianqian Li","doi":"10.1016/j.jpowsour.2024.235800","DOIUrl":"10.1016/j.jpowsour.2024.235800","url":null,"abstract":"<div><div>Silicon oxide (SiO<sub>x</sub>) shows great potential to be used in grid energy storage as the high-energy density anodes for lithium-ion batteries (LIBs) due to its low cost and high theoretical capacity. While the issues like low conductivity and volume expansion during cycles significantly decay the battery rate capability and cycle stability. To address the overall challenges, we effectively modified SiO<sub>x</sub> hybrid structure by introducing metal incorporating porous carbon, derived from metal-organic frameworks (MOFs), denoted as Fe-C/SiO<sub>x</sub>. The core-shell structure, coupled with the unique properties of both Fe-C and SiO<sub>x</sub> components, offers a synergistic effect that effectively mitigates volume expansion and low conductivity problems, resulting in significant improvements in electrochemical performance. A discharge capacity of 658 mAh g<sup>−1</sup> at 100 mA g<sup>−1</sup> and an initial coulombic efficiency of 60 % are achieved. Additionally, it exhibits long-term cyclic stability with capacity of 650 mAh g<sup>−1</sup> after 300 cycles at 100 mA g<sup>−1</sup>, and 337 mAh g<sup>−1</sup> after 500 cycles at 500 mA g<sup>−1</sup>. The lithium ion storage mechanism investigation suggests conductive matrix of porous Fe-C primarily facilitates enhanced lithium-ion diffusion dynamics and offers pseudocapacitance to the electrode, which is crucial for practical battery applications where fast charging and discharging are required.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235800"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gradient composition design of FeCoCrMnNi high entropy alloys: An efficient and stable electrocatalyst for water splitting 铁钴铬锰镍高熵合金的梯度成分设计：高效稳定的水分离电催化剂

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235804

Bo Wen, Xin Zhao, Qinglong Dong, Bo Li, Xiao Lyu

FeCoCrMnNi high entropy alloys (HEAs) are synthesized on nickel form by pulse electrodeposition as an efficient and stable electrocatalyst for water splitting. Due to the gradient composition of metal elements, which enhance the synergistic effect for FeCoCrMnNi HEA, FeCoCrMnNi HEA shows excellent catalytic activities and stabilities on both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte. For HER, FeCoCrMnNi exhibits a low overpotential of 168 mV at current density of 10 mA cm⁻² and a Tafel slope of 180 mV dec⁻¹. For OER, FeCoCrMnNi shows an overpotential of 231 mV at 10 mA cm⁻², which is much lower than that of commercial IrO₂ electrocatalyst (330 mV). Moreover, FeCoCrMnNi exhibits an extraordinary stability in the current-density (i-t) test for 100 h at 100 mA cm⁻², which results from the self-sacrificed leaching of Cr and high valence state of Mn exposes more electrocatalytic active sites on external surface. Therefore, the gradient composition design for high entropy alloys gives a new path to synthesize efficient and stable electrocatalysts for water splitting.

通过脉冲电沉积法在镍基上合成了铁钴铬镍高熵合金（HEAs），作为一种高效稳定的水分离电催化剂。由于金属元素的梯度组成增强了铁钴铬镍高熵合金的协同效应，铁钴铬镍高熵合金在碱性电解质中对氢进化反应（HER）和氧进化反应（OER）均表现出优异的催化活性和稳定性。对于氢进化反应，FeCoCrMnNi 在电流密度为 10 mA cm-2 时显示出 168 mV 的低过电位和 180 mV dec-1 的 Tafel 斜坡。对于 OER，FeCoCrMnNi 在 10 mA cm-2 时的过电位为 231 mV，远低于商用 IrO2 电催化剂的过电位（330 mV）。此外，FeCoCrMnNi 在 100 mA cm-2 的电流密度（i-t）测试中表现出了超常的稳定性，这是由于 Cr 的自我牺牲浸出和 Mn 的高价态在外层表面暴露出了更多的电催化活性位点。因此，高熵合金的梯度成分设计为合成高效稳定的水分离电催化剂提供了一条新途径。

{"title":"Gradient composition design of FeCoCrMnNi high entropy alloys: An efficient and stable electrocatalyst for water splitting","authors":"Bo Wen, Xin Zhao, Qinglong Dong, Bo Li, Xiao Lyu","doi":"10.1016/j.jpowsour.2024.235804","DOIUrl":"10.1016/j.jpowsour.2024.235804","url":null,"abstract":"<div><div>FeCoCrMnNi high entropy alloys (HEAs) are synthesized on nickel form by pulse electrodeposition as an efficient and stable electrocatalyst for water splitting. Due to the gradient composition of metal elements, which enhance the synergistic effect for FeCoCrMnNi HEA, FeCoCrMnNi HEA shows excellent catalytic activities and stabilities on both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte. For HER, FeCoCrMnNi exhibits a low overpotential of 168 mV at current density of 10 mA cm<sup>−2</sup> and a Tafel slope of 180 mV dec<sup>−1</sup>. For OER, FeCoCrMnNi shows an overpotential of 231 mV at 10 mA cm<sup>−2</sup>, which is much lower than that of commercial IrO<sub>2</sub> electrocatalyst (330 mV). Moreover, FeCoCrMnNi exhibits an extraordinary stability in the current-density (i-t) test for 100 h at 100 mA cm<sup>−2</sup>, which results from the self-sacrificed leaching of Cr and high valence state of Mn exposes more electrocatalytic active sites on external surface. Therefore, the gradient composition design for high entropy alloys gives a new path to synthesize efficient and stable electrocatalysts for water splitting.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235804"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancement of K storage performance in K3V3-xLax(PO4)4/C cathode materials for potassium-ion batteries via La3+ gradient doping 通过 La3+ 梯度掺杂提高钾离子电池 K3V3-xLax(PO4)4/C 阴极材料的钾存储性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235802

Shushu Li , Maozheng Li , Lei Peng , Zhenzhen Liu , Jing Su , Xiaoyan Lv , Hongxiang Kuai , Yanxuan Wen

K₃V₃(PO₄₎₄(KVP) is recognized as a promising cathode material for potassium-ion batteries (PIBs) due to its high capacity and robust cycling performance. However, its practical application is hindered by low electrical conductivity. This study reports on the synthesis of K₃V_3-xLa_x(PO₄)₄/C materials with varying levels of lanthanum doping, using sol-gel method. We conducted a systematic investigation into the effects of La³⁺ doping on the crystal structure, morphological characteristics, and electrochemical performance through physicochemical characterization, theoretical calculations, and electrochemical testing. Theoretical calculations suggest that La³⁺ doping reduces the band gap energy. Electrochemical tests demonstrate that appropriate levels of La³⁺ doping enhance the electrochemical performance of K₃V_3-xLa_x(PO₄)₄/C. Specifically, K₃V_2.98La_0.02(PO₄)₄/C shows excellent electrochemical performance. After 100 cycles at 200 mA g⁻¹, the discharge specific capacity reaches 59 mAh g⁻¹, and after 300 cycles at 400 mA g⁻¹, the reversible specific capacity maintains at 48 mAh g⁻¹—nearly twice that of the undoped KVP/C. The enhanced electrochemical performance of these materials is attributed to La³⁺ doping, which appropriately enlarges the unit cell volume while stabilizing the crystal structure, improving K⁺ diffusion capability, and boosting the intrinsic electronic conductivity of the material. These findings offer new insights for developing cost-effective and high-performance cathode materials for PIBs.

K3V3(PO4)4(KVP)因其高容量和稳定的循环性能而被认为是一种很有前途的钾离子电池（PIB）正极材料。然而，低导电率阻碍了它的实际应用。本研究采用溶胶-凝胶法合成了不同镧掺杂水平的 K3V3-xLax(PO4)4/C 材料。我们通过物理化学表征、理论计算和电化学测试，系统研究了掺杂 La3+ 对晶体结构、形貌特征和电化学性能的影响。理论计算表明，掺杂 La3+ 会降低带隙能。电化学测试表明，适当水平的 La3+ 掺杂可提高 K3V3-xLax(PO4)4/C 的电化学性能。具体来说，K3V2.98La0.02(PO4)4/C 表现出了优异的电化学性能。在 200 mA g-1 下循环 100 次后，放电比容量达到 59 mAh g-1，在 400 mA g-1 下循环 300 次后，可逆比容量保持在 48 mAh g-1，几乎是未掺杂 KVP/C 的两倍。这些材料电化学性能的提高归功于 La3+ 的掺杂，La3+ 的掺杂在稳定晶体结构、改善 K+ 扩散能力和提高材料内在电子导电性的同时，适当地增大了单胞体积。这些发现为开发具有成本效益和高性能的 PIB 阴极材料提供了新的思路。

{"title":"Enhancement of K storage performance in K3V3-xLax(PO4)4/C cathode materials for potassium-ion batteries via La3+ gradient doping","authors":"Shushu Li , Maozheng Li , Lei Peng , Zhenzhen Liu , Jing Su , Xiaoyan Lv , Hongxiang Kuai , Yanxuan Wen","doi":"10.1016/j.jpowsour.2024.235802","DOIUrl":"10.1016/j.jpowsour.2024.235802","url":null,"abstract":"<div><div>K<sub>3</sub>V<sub>3</sub>(PO<sub>4)4</sub>(KVP) is recognized as a promising cathode material for potassium-ion batteries (PIBs) due to its high capacity and robust cycling performance. However, its practical application is hindered by low electrical conductivity. This study reports on the synthesis of K<sub>3</sub>V<sub>3-x</sub>La<sub>x</sub>(PO<sub>4</sub>)<sub>4</sub>/C materials with varying levels of lanthanum doping, using sol-gel method. We conducted a systematic investigation into the effects of La<sup>3+</sup> doping on the crystal structure, morphological characteristics, and electrochemical performance through physicochemical characterization, theoretical calculations, and electrochemical testing. Theoretical calculations suggest that La<sup>3+</sup> doping reduces the band gap energy. Electrochemical tests demonstrate that appropriate levels of La<sup>3+</sup> doping enhance the electrochemical performance of K<sub>3</sub>V<sub>3-x</sub>La<sub>x</sub>(PO<sub>4</sub>)<sub>4</sub>/C. Specifically, K<sub>3</sub>V<sub>2.98</sub>La<sub>0.02</sub>(PO<sub>4</sub>)<sub>4</sub>/C shows excellent electrochemical performance. After 100 cycles at 200 mA g<sup>−1</sup>, the discharge specific capacity reaches 59 mAh g<sup>−1</sup>, and after 300 cycles at 400 mA g<sup>−1</sup>, the reversible specific capacity maintains at 48 mAh g<sup>−1</sup>—nearly twice that of the undoped KVP/C. The enhanced electrochemical performance of these materials is attributed to La<sup>3+</sup> doping, which appropriately enlarges the unit cell volume while stabilizing the crystal structure, improving K<sup>+</sup> diffusion capability, and boosting the intrinsic electronic conductivity of the material. These findings offer new insights for developing cost-effective and high-performance cathode materials for PIBs.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235802"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance zinc anodes enabled by atmospheric plasma enhanced cellulose protective layer for zinc ion batteries 通过大气等离子体增强纤维素保护层实现用于锌离子电池的高性能锌阳极

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235699

Junlun Cao , Zhiyu Wang , Zixuan Yang , Kunning Tang , Shana Wang , Weiwei Lei , Dan Liu

Zinc (Zn) anode suffers from poor surface stability caused by Zn dendrite formation and side reactions, which hinder the development of aqueous zinc ion batteries (ZIBs) for clean and safe energy storage. Conventional interfacial layers based on polymetric and bioderived materials may be subjected to uneven ion transport and week structural integrity during cycling. Herein, a scalable and facile atmospheric plasma (AP)-based approach is proposed and systematically studied to improve the electrochemical performance of Zn interfacial layers via plasma induced surface modification. Instrumental characterization in conjunction with ion flow simulation indicate that AP modified cellulose-based Zn artificial layer with more negatively charged surface and improved mechanical property exhibits significantly enhanced cycling stability and dendritic suppression capability, leading to an improved cycling stability of more than 1000 h at a current density of 10 mA cm⁻² for 1 mA h cm⁻² for Zn anode with such interfacial layer. Moreover, the versatility of the AP treatment can also be extended to other polymers such as polyvinylidene fluoride (PVDF) and polyvinyl alcohol (PVA). As a result, the full cells using AP-treated Zn anodes exhibit outstanding cycling stability for more than 1500 cycles. This work offers a scalable and facile surface treatment solution to improve the surface stability of Zn anodes.

由于锌枝晶的形成和副反应，锌（Zn）阳极的表面稳定性很差，这阻碍了用于清洁安全储能的水性锌离子电池（ZIB）的发展。基于多金属和生物材料的传统界面层在循环过程中可能会出现离子传输不均和结构完整性受损的问题。本文提出了一种基于大气等离子体（AP）的可扩展且简便的方法，并对其进行了系统研究，以通过等离子体诱导的表面改性改善锌界面层的电化学性能。仪器表征结合离子流模拟表明，AP 修饰的纤维素基 Zn 人工层表面带更多负电荷，机械性能得到改善，循环稳定性和树枝状抑制能力显著提高，从而使具有这种界面层的 Zn 阳极在 10 mA cm-2 电流密度下的循环稳定性提高了 1000 小时以上，而 1 mA h cm-2 则为 1 mA h cm-2。此外，AP 处理的多功能性还可扩展到其他聚合物，如聚偏氟乙烯（PVDF）和聚乙烯醇（PVA）。因此，使用 AP 处理过的锌阳极的全电池在超过 1500 个循环周期中表现出卓越的循环稳定性。这项研究为提高锌阳极的表面稳定性提供了一种可扩展的简便表面处理方案。

{"title":"High-performance zinc anodes enabled by atmospheric plasma enhanced cellulose protective layer for zinc ion batteries","authors":"Junlun Cao , Zhiyu Wang , Zixuan Yang , Kunning Tang , Shana Wang , Weiwei Lei , Dan Liu","doi":"10.1016/j.jpowsour.2024.235699","DOIUrl":"10.1016/j.jpowsour.2024.235699","url":null,"abstract":"<div><div>Zinc (Zn) anode suffers from poor surface stability caused by Zn dendrite formation and side reactions, which hinder the development of aqueous zinc ion batteries (ZIBs) for clean and safe energy storage. Conventional interfacial layers based on polymetric and bioderived materials may be subjected to uneven ion transport and week structural integrity during cycling. Herein, a scalable and facile atmospheric plasma (AP)-based approach is proposed and systematically studied to improve the electrochemical performance of Zn interfacial layers via plasma induced surface modification. Instrumental characterization in conjunction with ion flow simulation indicate that AP modified cellulose-based Zn artificial layer with more negatively charged surface and improved mechanical property exhibits significantly enhanced cycling stability and dendritic suppression capability, leading to an improved cycling stability of more than 1000 h at a current density of 10 mA cm<sup>−2</sup> for 1 mA h cm<sup>−2</sup> for Zn anode with such interfacial layer. Moreover, the versatility of the AP treatment can also be extended to other polymers such as polyvinylidene fluoride (PVDF) and polyvinyl alcohol (PVA). As a result, the full cells using AP-treated Zn anodes exhibit outstanding cycling stability for more than 1500 cycles. This work offers a scalable and facile surface treatment solution to improve the surface stability of Zn anodes.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235699"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metal organic framework (MOF-5) and graphene oxide (GO) derived photoanodes for an efficient dye-sensitized solar cells 用于高效染料敏化太阳能电池的金属有机框架 (MOF-5) 和氧化石墨烯 (GO) 衍生光阳极

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235811

Esra Kaya , Arife Gencer Imer , Mehmet Gülcan

In this work, graphene oxide (GO) and metal organic frameworks (MOF-5) have been used as adding materials in the modification of photoanode to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). The photoconversion efficiency (PCE) is systematically examined in DSSCs, consisting of MOF-5 or GO incorporated TiO₂, GO/MOF-5 derived and pure photoanodes. The short circuit current density (J_SC) becomes higher after GO incorporating, resulting in improved PCE of the device compared with pristine one, due to its fast electron transport property. After the addition with GO/MOF-5, J_SC value gets close to that of pure one, due to suppression of electron transport, the photoelectron trapping at the interface. Moreover, adding with MOF-5 structure introduces better photovoltaic parameters with higher J_SC and open circuit voltage (V_OC) values, due to the high pore structure of MOF-5 material. Its property endues a high dye adsorption capability of MOF-5 modified photoanode, monitored by absorbance spectrum of dye-loaded one. The PCE of DSSC conducted with MOF-5 derived photoanode is 5.56 times superior to pure device, owing to improved light harvesting, and enhanced charge collection efficiency. The obtained results shed light on the important impact of derived photoanodes for DSSC applications in the future photovoltaic technologies.

在这项研究中，氧化石墨烯（GO）和金属有机框架（MOF-5）被用作改性光阳极的添加材料，以提高染料敏化太阳能电池（DSSC）的光电性能。我们系统地研究了含有 MOF-5 或 GO 的 TiO2、GO/MOF-5 衍生光阳极和纯光阳极的 DSSC 的光电转换效率（PCE）。加入 GO 后，短路电流密度（JSC）变高，与原始器件相比，由于其快速电子传输特性，器件的 PCE 有所提高。加入 GO/MOF-5 后，JSC 值接近纯阳极，这是由于电子传输受到抑制，光电子在界面上被捕获。此外，加入 MOF-5 结构后，由于 MOF-5 材料的高孔隙结构，光电参数更佳，JSC 值和开路电压 (VOC) 值更高。这一特性使 MOF-5 改性光阳极具有很高的染料吸附能力，这可以通过染料负载光阳极的吸光度光谱来监测。由于改善了光收集并提高了电荷收集效率，使用 MOF-5 衍生光阳极的 DSSC 的 PCE 是纯器件的 5.56 倍。这些结果表明，衍生光阳极对未来光伏技术中的 DSSC 应用具有重要影响。

{"title":"Metal organic framework (MOF-5) and graphene oxide (GO) derived photoanodes for an efficient dye-sensitized solar cells","authors":"Esra Kaya , Arife Gencer Imer , Mehmet Gülcan","doi":"10.1016/j.jpowsour.2024.235811","DOIUrl":"10.1016/j.jpowsour.2024.235811","url":null,"abstract":"<div><div>In this work, graphene oxide (GO) and metal organic frameworks (MOF-5) have been used as adding materials in the modification of photoanode to enhance the photovoltaic performance of dye-sensitized solar cells (DSSCs). The photoconversion efficiency (PCE) is systematically examined in DSSCs, consisting of MOF-5 or GO incorporated TiO<sub>2</sub>, GO/MOF-5 derived and pure photoanodes. The short circuit current density (J<sub>SC</sub>) becomes higher after GO incorporating, resulting in improved PCE of the device compared with pristine one, due to its fast electron transport property. After the addition with GO/MOF-5, J<sub>SC</sub> value gets close to that of pure one, due to suppression of electron transport, the photoelectron trapping at the interface. Moreover, adding with MOF-5 structure introduces better photovoltaic parameters with higher J<sub>SC</sub> and open circuit voltage (V<sub>OC</sub>) values, due to the high pore structure of MOF-5 material. Its property endues a high dye adsorption capability of MOF-5 modified photoanode, monitored by absorbance spectrum of dye-loaded one. The PCE of DSSC conducted with MOF-5 derived photoanode is 5.56 times superior to pure device, owing to improved light harvesting, and enhanced charge collection efficiency. The obtained results shed light on the important impact of derived photoanodes for DSSC applications in the future photovoltaic technologies.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"626 ","pages":"Article 235811"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon black SP is a carbon material more suitable for SiOx than graphite 碳黑 SP 是一种比石墨更适用于氧化硅的碳材料

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235779

Chunyang Song , Feilong Zhang , Yafei Qiao , Shuang Tian , Zhilong He , Jie Gao , Yonggao Xia

To enhance the cycle stability of the SiOx anode in high-energy-density lithium-ion batteries from the perspective of electrode formulation, this paper investigates why SP is more suitable for SiOx than Gr, as well as the influence of SP content on the performance of the SiOx anode. The findings reveal that, compared to Gr, SP exhibits superior ionic conductivity. Moreover, the carbon binder domains (CBD) network formed by SP and the binder demonstrates a more effective buffering capacity against the volume expansion of SiOx than that of Gr. Additionally, SP is observed to elevate the lithium intercalation potential of SiOx, thereby endowing SiOx with a higher specific capacity. Nonetheless, the use of SP also introduces several challenges. On one hand, it can induce uneven lithium deposition on the composite electrode, leading to electrode cracking. On the other hand, the very low initial coulombic efficiency (ICE) of SP results in an irreversible loss of lithium ions on the cathode electrode side in a full cell configuration. Consequently, when designing a full cell, it is imperative to consider the inherent characteristics of SP, and optimization can be achieved by adjusting the negative/positive capacity ratio (N/P) or employing prelithiation methods.

为了从电极配方的角度提高氧化硅负极在高能量密度锂离子电池中的循环稳定性，本文研究了为什么 SP 比 Gr 更适合氧化硅，以及 SP 含量对氧化硅负极性能的影响。研究结果表明，与 Gr 相比，SP 表现出更优越的离子导电性。此外，与 Gr 相比，由 SP 和粘结剂形成的碳粘结剂域（CBD）网络对氧化硅的体积膨胀具有更有效的缓冲能力。此外，SP 还能提高氧化硅的锂插层电位，从而赋予氧化硅更高的比容量。然而，SP 的使用也带来了一些挑战。一方面，它可能导致复合电极上的锂沉积不均匀，从而导致电极开裂。另一方面，SP 的初始库仑效率（ICE）非常低，在全电池配置中会导致阴极电极一侧锂离子的不可逆损失。因此，在设计全电池时，必须考虑 SP 的固有特性，并通过调整负极/正极容量比（N/P）或采用预锂化方法实现优化。

{"title":"Carbon black SP is a carbon material more suitable for SiOx than graphite","authors":"Chunyang Song , Feilong Zhang , Yafei Qiao , Shuang Tian , Zhilong He , Jie Gao , Yonggao Xia","doi":"10.1016/j.jpowsour.2024.235779","DOIUrl":"10.1016/j.jpowsour.2024.235779","url":null,"abstract":"<div><div>To enhance the cycle stability of the SiOx anode in high-energy-density lithium-ion batteries from the perspective of electrode formulation, this paper investigates why SP is more suitable for SiOx than Gr, as well as the influence of SP content on the performance of the SiOx anode. The findings reveal that, compared to Gr, SP exhibits superior ionic conductivity. Moreover, the carbon binder domains (CBD) network formed by SP and the binder demonstrates a more effective buffering capacity against the volume expansion of SiOx than that of Gr. Additionally, SP is observed to elevate the lithium intercalation potential of SiOx, thereby endowing SiOx with a higher specific capacity. Nonetheless, the use of SP also introduces several challenges. On one hand, it can induce uneven lithium deposition on the composite electrode, leading to electrode cracking. On the other hand, the very low initial coulombic efficiency (ICE) of SP results in an irreversible loss of lithium ions on the cathode electrode side in a full cell configuration. Consequently, when designing a full cell, it is imperative to consider the inherent characteristics of SP, and optimization can be achieved by adjusting the negative/positive capacity ratio (N/P) or employing prelithiation methods.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235779"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering to disrupt ZIF-67 formation: Novel strategy for constructing hierarchically three-dimensional NiCo-layered double Hydroxide@Co-ZIF-L composites for enhancing energy storage 通过工程设计破坏 ZIF-67 的形成：构建分层三维镍钴层双氢氧化物@Co-ZIF-L复合材料以增强能量存储的新策略

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-12 DOI: 10.1016/j.jpowsour.2024.235789

Chenhan Xiong, Qiang Long, Jiaqi Chen, Yanqiu Yu, Xinming Lian, Rui Xue, Junjie Wang, Shufang Zheng, Guoping Du, Nan Chen

Effective design and construction of highly electrochemically active materials on conductive substrates with hierarchical nanostructures are critical for enhancing the electrochemical energy storage performance of electrodes. However, the design of such special structures is still challenging. In this study, a special three-dimensional@three-dimensional (3D@3D) NiCo-layered double hydroxide (NiCo-LDH) composite nanostructure is developed through the innovative approach of in-situ growth of arrayed Co-Zif-L on conductive substrate, disrupting the Zif-67 formation. This is followed by ion exchange process and electrochemical synthesis for growing 3D NiCo-LDH nanosheets. A unique structure with the 3D NiCo-LDH embedded in the 3D Co-Zif-L structure, termed as 3D@3D, is resulted. This spatial structure not only enhances their mechanical stability and adhesion strength through the in-situ growth process, but also provides a greater number of electrochemical active sites due to its ultra-large specific surface area. Density functional theory (DFT) calculations reveal that the NiCo-LDH@Co-Zif-L composite nanostructure exhibits an enhanced density of states (DOS) near the Fermi level compared to individual components, indicating excellent conductivity. With this unique structure, the NiCo-LDH@Co-Zif-L/NF electrode demonstrates an area-specific capacity of 4.1C cm⁻² and retains 81.9 % of its initial capacitance after 5000 cycles. Moreover, the assembled hybrid supercapacitor achieves an energy density of 222.2 mWh cm⁻² at a power density of 800 mW cm⁻² (66.9 Wh kg⁻¹ at 245 W/kg). The innovative approach in this work provides new insights into the utilization of Zif materials and designing electrode materials with special structures for high-performance electrochemical energy storage devices.

在导电基底上有效设计和构建具有分层纳米结构的高电化学活性材料，对于提高电极的电化学储能性能至关重要。然而，这种特殊结构的设计仍然具有挑战性。在本研究中，通过在导电基底上原位生长阵列 Co-Zif-L、破坏 Zif-67 形成的创新方法，开发出了一种特殊的三维@三维（3D@3D）镍钴层状双氢氧化物（NiCo-LDH）复合纳米结构。随后，通过离子交换工艺和电化学合成技术生长出三维 NiCo-LDH 纳米片。这样就形成了一种独特的结构，即三维 NiCo-LDH 嵌入到三维 Co-Zif-L 结构中，这种结构被称为 3D@3D。这种空间结构不仅通过原位生长过程增强了其机械稳定性和粘附强度，还因其超大比表面积而提供了更多的电化学活性位点。密度泛函理论（DFT）计算显示，与单个成分相比，NiCo-LDH@Co-Zif-L 复合纳米结构在费米级附近显示出更高的状态密度（DOS），表明其具有优异的导电性。凭借这种独特的结构，NiCo-LDH@Co-Zif-L/NF 电极显示出 4.1C cm-2 的特定区域电容，并在 5000 次循环后保持了 81.9% 的初始电容。此外，组装后的混合超级电容器在功率密度为 800 mW cm-2 时的能量密度达到 222.2 mWh cm-2（245 W/kg 时为 66.9 Wh kg-1）。这项工作中的创新方法为利用 Zif 材料和为高性能电化学储能装置设计具有特殊结构的电极材料提供了新的思路。

{"title":"Engineering to disrupt ZIF-67 formation: Novel strategy for constructing hierarchically three-dimensional NiCo-layered double Hydroxide@Co-ZIF-L composites for enhancing energy storage","authors":"Chenhan Xiong, Qiang Long, Jiaqi Chen, Yanqiu Yu, Xinming Lian, Rui Xue, Junjie Wang, Shufang Zheng, Guoping Du, Nan Chen","doi":"10.1016/j.jpowsour.2024.235789","DOIUrl":"10.1016/j.jpowsour.2024.235789","url":null,"abstract":"<div><div>Effective design and construction of highly electrochemically active materials on conductive substrates with hierarchical nanostructures are critical for enhancing the electrochemical energy storage performance of electrodes. However, the design of such special structures is still challenging. In this study, a special three-dimensional@three-dimensional (3D@3D) NiCo-layered double hydroxide (NiCo-LDH) composite nanostructure is developed through the innovative approach of in-situ growth of arrayed Co-Zif-L on conductive substrate, disrupting the Zif-67 formation. This is followed by ion exchange process and electrochemical synthesis for growing 3D NiCo-LDH nanosheets. A unique structure with the 3D NiCo-LDH embedded in the 3D Co-Zif-L structure, termed as 3D@3D, is resulted. This spatial structure not only enhances their mechanical stability and adhesion strength through the in-situ growth process, but also provides a greater number of electrochemical active sites due to its ultra-large specific surface area. Density functional theory (DFT) calculations reveal that the NiCo-LDH@Co-Zif-L composite nanostructure exhibits an enhanced density of states (DOS) near the Fermi level compared to individual components, indicating excellent conductivity. With this unique structure, the NiCo-LDH@Co-Zif-L/NF electrode demonstrates an area-specific capacity of 4.1C cm<sup>−2</sup> and retains 81.9 % of its initial capacitance after 5000 cycles. Moreover, the assembled hybrid supercapacitor achieves an energy density of 222.2 mWh cm<sup>−2</sup> at a power density of 800 mW cm<sup>−2</sup> (66.9 Wh kg<sup>−1</sup> at 245 W/kg). The innovative approach in this work provides new insights into the utilization of Zif materials and designing electrode materials with special structures for high-performance electrochemical energy storage devices.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"627 ","pages":"Article 235789"},"PeriodicalIF":8.1,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ferromagnetic and defect-rich Fe3O4-CC nanowires regulating Li2S deposition for stable lithium-sulfur batteries 铁磁性和富含缺陷的 Fe3O4-CC 纳米线调节 Li2S 沉积，实现稳定的锂硫电池

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-11 DOI: 10.1016/j.jpowsour.2024.235785

Naomie Beolle Songwe Selabi , Yingke Zhou , Lukang Che , Mengdie Liu , Luozhi Mo , Lesly Dasilva Wandji Djouonkep , Xiaohui Tian

Lithium-sulfur (Li-S) batteries with superior energy storage capabilities, stand out as the next-generation battery technology surpassing conventional lithium batteries. Unfortunately, the sluggish kinetics of the sulfur reaction and the uncontrollable deposition of insulated Li₂S significantly limit the efficiency of the battery. In this work, a morphology control method was employed to modulate the intrinsic properties of iron oxide catalyst and accelerate the LiPSs conversion kinetics. The uniform distributed nanowire provides abundant nucleation sites for the effective deposition of 3D Li₂S, providing high sulfur utilization and stable Li-S battery. In the action of intrinsic magnetic forces, the Fe₃O₄-CC fastens the redox reaction and alleviates the shuttle of LiPSs. The optimized Fe₃O₄-CC@S cathode exhibits high-capacity (5.9 mAh/cm²) with a high mass loading (5.6 mg/cm²) at 0.1C, as well as good cycle performance. This study highlights a novel strategy to stimulate high catalytic activity to enhance the conversion reaction of LiPSs, promoting the practical use of Li-S batteries as next-generation energy storage.

锂硫（Li-S）电池具有卓越的储能能力，是超越传统锂电池的新一代电池技术。遗憾的是，硫反应的缓慢动力学和绝缘锂硫的不可控沉积大大限制了电池的效率。在这项工作中，采用了一种形态控制方法来调节氧化铁催化剂的内在特性，并加速锂离子电池的转化动力学。均匀分布的纳米线为三维 Li2S 的有效沉积提供了丰富的成核位点，从而提供了高硫利用率和稳定的锂离子电池。在固有磁力的作用下，Fe3O4-CC 加快了氧化还原反应，减轻了锂离子电池的穿梭。优化后的 Fe3O4-CC@S 正极在 0.1C 时以较高的质量负载（5.6 mg/cm2）表现出较高的容量（5.9 mAh/cm2）以及良好的循环性能。这项研究强调了一种激发高催化活性以增强锂离子电池转化反应的新策略，从而促进了锂离子电池作为下一代储能装置的实际应用。

{"title":"Ferromagnetic and defect-rich Fe3O4-CC nanowires regulating Li2S deposition for stable lithium-sulfur batteries","authors":"Naomie Beolle Songwe Selabi , Yingke Zhou , Lukang Che , Mengdie Liu , Luozhi Mo , Lesly Dasilva Wandji Djouonkep , Xiaohui Tian","doi":"10.1016/j.jpowsour.2024.235785","DOIUrl":"10.1016/j.jpowsour.2024.235785","url":null,"abstract":"<div><div>Lithium-sulfur (Li-S) batteries with superior energy storage capabilities, stand out as the next-generation battery technology surpassing conventional lithium batteries. Unfortunately, the sluggish kinetics of the sulfur reaction and the uncontrollable deposition of insulated Li<sub>2</sub>S significantly limit the efficiency of the battery. In this work, a morphology control method was employed to modulate the intrinsic properties of iron oxide catalyst and accelerate the LiPSs conversion kinetics. The uniform distributed nanowire provides abundant nucleation sites for the effective deposition of 3D Li<sub>2</sub>S, providing high sulfur utilization and stable Li-S battery. In the action of intrinsic magnetic forces, the Fe<sub>3</sub>O<sub>4</sub>-CC fastens the redox reaction and alleviates the shuttle of LiPSs. The optimized Fe<sub>3</sub>O<sub>4</sub>-CC@S cathode exhibits high-capacity (5.9 mAh/cm<sup>2</sup>) with a high mass loading (5.6 mg/cm<sup>2</sup>) at 0.1C, as well as good cycle performance. This study highlights a novel strategy to stimulate high catalytic activity to enhance the conversion reaction of LiPSs, promoting the practical use of Li-S batteries as next-generation energy storage.</div></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":"626 ","pages":"Article 235785"},"PeriodicalIF":8.1,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142656485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0