Journal of Power Sources最新文献_第5页

Detecting and repairing micro defects in perfluorinated ion exchange membranes for redox flow batteries 检测和修复用于氧化还原液流电池的全氟离子交换膜中的微缺陷

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-27 DOI: 10.1016/j.jpowsour.2024.235930

Honghao Qi , Lyuming Pan , Jing Sun , Nimra Muzaffar , Jiayou Ren , Hucheng Li , Yilin Wang , Qinping Jian , Hengxing Xie , Meisheng Han , Yubai Li , Xinzhuang Fan , Lin Zeng , Lei Wei , Tianshou Zhao

Ion exchange membranes play a vital role in redox flow batteries. However, polymer membranes with a microscopic thickness of approximately 20–50 μm are susceptible to micro defects, which substantially reduces the battery's energy efficiency and cycling stability. Hence, there is a need for an effective strategy to identify and resolve membrane imperfections, which is currently missing in the literature. In this work, a pressure-retention setup and hot-pressing method are proposed and show that defective membranes can be effectively identified and resolved. For instance, a membrane with around 100-μm pinholes exhibits a low coulombic efficiency of 77.5 % at the current density of 100 mA cm⁻². However, the coulombic efficiency can be raised to 96.3 % by removing the defects, thus attaining the level of the undamaged pristine membrane (96.4 %). The capacity retention rate of the vanadium redox flow batteries with the repaired membrane is 71.1 % over 100 cycles at the current density of 200 mA cm⁻², close to that of the pristine membrane (72.2 %). In addition, the repaired membrane exhibits quite similar physicochemical properties to the pristine membrane from various characterizations. The proposed method represents a convenient, economical, and non-destructive membrane detecting and repairing strategy, demonstrating great potential for redox flow batteries.

离子交换膜在氧化还原液流电池中发挥着重要作用。然而，微观厚度约为 20-50 μm 的聚合物膜很容易出现微小缺陷，这大大降低了电池的能量效率和循环稳定性。因此，需要一种有效的策略来识别和解决膜缺陷，而目前的文献中还没有这方面的研究。本研究提出了一种压力保持装置和热压方法，结果表明可以有效识别和解决缺陷隔膜。例如，在电流密度为 100 mA cm-2 时，存在约 100μm 针孔的膜的库仑效率较低，仅为 77.5%。然而，通过消除缺陷，库仑效率可以提高到 96.3%，从而达到未损坏的原始膜的水平（96.4%）。在电流密度为 200 mA cm-2 的条件下，使用修复膜的钒氧化还原液流电池在 100 次循环中的容量保持率为 71.1%，接近原始膜的容量保持率（72.2%）。此外，从各种表征来看，修复后的膜与原始膜具有非常相似的物理化学特性。所提出的方法是一种方便、经济、无损的膜检测和修复策略，在氧化还原液流电池方面具有巨大潜力。

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引用次数: 0

Assessing degradation modes in cylindrical lithium-ion batteries: A non-invasive method using the entropic heat flow or surface temperature 评估圆柱形锂离子电池的降解模式：使用熵热流或表面温度的非侵入式方法

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235732

Alexander Kunz , Cedric Kirst , Axel Durdel , Jan P. Singer , Andreas Jossen

Degradation mode analysis for lithium-ion batteries is typically conducted based on a comparison of potential measurements (PM) between a pristine and aged cell. This publication introduces two methods, either based on heat flow in an isothermal micro-calorimeter (CM) or cell surface temperature (TM). Their feasibility for degradation mode analysis was tested using commercial 18650 LFP/graphite and 21700 NCA/silicon–graphite cells. To reconstruct the entropic coefficient (EnCo) of the pristine and aged full-cell, pristine half-cell EnCos were measured in a micro-calorimeter. These half-cell EnCos were then superimposed to reconstruct the full-cell EnCo from either of the two new methods, CM and TM. The conventional PM-method serves as a validation. The degradation mode results indicate that the proposed methods are possibly more effective for LFP, while providing equivalent results for NCA and graphite electrodes. For silicon–graphite electrodes, an electrode composite model is potentially required. Regarding the measurement of the EnCo itself, the introduced methods significantly reduce measurement time compared to conventional methods, such as potentiometric tracking of entropy change in aging markers. The proposed TM-method might be of interest in applications, as the change in EnCo can be observed by a PT100 temperature sensor, facilitating a non-invasive rapid degradation mode estimation method.

锂离子电池的降解模式分析通常是基于原始电池和老化电池之间的电位测量（PM）比较进行的。本出版物介绍了两种方法，一种是基于等温微量热仪（CM）中的热流，另一种是基于电池表面温度（TM）。使用商用 18650 LFP/石墨电池和 21700 NCA/硅石墨电池测试了这两种方法在降解模式分析中的可行性。为了重建原始和老化全电池的熵系数（EnCo），在微量热计中测量了原始半电池的 EnCos。然后将这些半电池 EnCos 叠加起来，用 CM 和 TM 两种新方法中的任何一种重建全电池 EnCo。传统的 PM 方法作为验证。降解模式结果表明，建议的方法对 LFP 可能更有效，而对 NCA 和石墨电极则提供了同等的结果。对于硅石墨电极，可能需要一个电极复合模型。关于 EnCo 本身的测量，与传统方法（如老化标记中熵变化的电位跟踪）相比，引入的方法大大缩短了测量时间。由于可以通过 PT100 温度传感器观察 EnCo 的变化，因此所提出的 TM 方法在应用中可能会很有意义，这有助于采用非侵入式快速降解模式估算方法。

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引用次数: 0

Comprehensive insight of charge storage and ion transport in bioinspired nanostructure electrode-patterned supercapacitors by multiscale investigation 通过多尺度研究全面了解生物启发纳米结构电极图案超级电容器中的电荷存储和离子传输

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235922

Hanghang Yan , Jinrong Su , Yaohong Xiao , Li Tian , Xiangyang Cui , Lei Chen

Supercapacitors with bioinspired leaves-on-branchlet hybrid carbon nanostructure-patterned electrodes show high areal capacitance and outstanding rate capability. However, the fundamental mechanisms of charge storage and ion transport in such a bioinspired supercapacitor at multiple length scales remain little explored. Herein, we develop a multi-scale model to comprehensively explore the mechanism of charge storage and ion transport, in which the finite-element-based Nernst-Planck-Poisson calculations are used for the macro-scale understanding, and molecular dynamics simulations for the atomic-scale investigation. High-throughput simulations are conducted to quantify the effect of the bioinspired structure, thermal influence, and size effect on the electrochemical performance of supercapacitors. An in-depth analysis of the simulation and experimental results demo some design advice are concluded, (1) engineering the hierarchical ordered electrode structure with sharp edges to promote charge storage and transfer, (2) designing the channel architecture with a width of ∼4 nm for avoiding size effect and improving the ion transport and storage performance. This work explores the electrochemical performance and structure properties of the devices which probably provide the designing and optimizing bases for achieving high-performance supercapacitors.

具有生物启发的枝叶混合碳纳米结构图案电极的超级电容器显示出高面积电容和出色的速率能力。然而，人们对这种生物启发超级电容器在多个长度尺度上的电荷存储和离子传输的基本机制仍然知之甚少。在此，我们建立了一个多尺度模型来全面探索电荷存储和离子传输机制，其中基于有限元的 Nernst-Planck-Poisson 计算用于宏观尺度的理解，分子动力学模拟用于原子尺度的研究。通过高通量模拟来量化生物启发结构、热影响和尺寸效应对超级电容器电化学性能的影响。通过对模拟和实验结果的深入分析，总结出了一些设计建议：（1）设计具有尖锐边缘的分层有序电极结构，以促进电荷存储和转移；（2）设计宽度为 4 纳米的通道结构，以避免尺寸效应，提高离子传输和存储性能。这项研究探讨了器件的电化学性能和结构特性，为实现高性能超级电容器提供了设计和优化基础。

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引用次数: 0

Molten carbonate electrolyzer for synthetic fuel generation 用于合成燃料发电的熔融碳酸盐电解槽

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235741

Aliaksandr Martsinchyk , Arkadiusz Szczęśniak , Katsiaryna Martsinchyk , Olaf Dybiński , Giovanni Cinti , Jarosław Milewski , Pavel Shuhayeu , Monika Łazor , Karol Ćwieka , Jakub Skibiński , Anna Boczkowska

In the transition to a CO2-neutral circular economy, innovative solutions for e-fuels production are imperative. This study delineates the potential of molten carbonate electrolysis, utilizing a reversible molten carbonate fuel cell technology, recognized for its efficacy in large-scale electrical power generation and CO2 capture, to steer a groundbreaking pathway to e-fuels production through molten carbon electrolyzer modality. By meticulously scrutinizing the rMCFC's electrochemical behavior under assorted thermal-flow parameters, we offer an incisive analysis of its operation in the electrolysis mode, thereby unveiling a promising avenue for high-efficiency gaseous fuel production through electrochemical reactions. The experimental study includes current-voltage assessments and electrochemical impedance spectroscopy analysis, providing an elucidative view of the cell's performance landscape. Moreover, SEM microscopy was employed in both pre- and post-mortem stages, facilitating a deep understanding of material degradation mechanisms. Our results not only enhance the contemporary comprehension of reversible cell operations but also delineate the pivotal operating parameters that are conducive to optimizing both fuel cell and electrolysis modes, signposting a highly promising route to efficient and sustainable e-fuels production for the future circular economy. This study stands as a critical milestone in harnessing the molten carbonate electrolysis technology as a corner stone on the roadmap towards achieving a high-efficiency e-fuels production ecosystem.

在向二氧化碳中性循环经济过渡的过程中，电子燃料生产的创新解决方案势在必行。本研究探讨了熔融碳酸盐电解的潜力，利用可逆熔融碳酸盐燃料电池技术（该技术因其在大规模发电和二氧化碳捕集方面的功效而广受认可），通过熔融碳电解槽模式为电子燃料生产开辟了一条突破性的道路。通过仔细研究 rMCFC 在各种热流参数下的电化学行为，我们对其在电解模式下的运行进行了深入分析，从而为通过电化学反应生产高效气体燃料开辟了一条前景广阔的道路。实验研究包括电流-电压评估和电化学阻抗光谱分析，为电池的性能状况提供了一个清晰的视角。此外，还在死前和死后阶段使用了扫描电镜显微镜，有助于深入了解材料降解机制。我们的研究结果不仅提高了当代人对可逆电池操作的理解，还划定了有利于优化燃料电池和电解模式的关键操作参数，为未来循环经济中高效、可持续的电子燃料生产指明了一条极具前景的道路。这项研究是利用熔融碳酸盐电解技术实现高效电子燃料生产生态系统的重要里程碑。

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引用次数: 0

Glyoxal-based electrolytes in potassium-ion capacitors 钾离子电容器中的乙二醛基电解质

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235903

Lea C. Meyer, Desirée Leistenschneider, Andrea Balducci

Potassium-based energy storage systems demonstrate promising potential for use in high-power applications, such as potassium-ion capacitors (PICs). In this study, we present the use of an electrolyte containing 1,1,2,2-tetraethoxyethane (TEG) in combination with propylene carbonate (PC) and potassium bis(fluorosulfonyl)imide (KFSI) as electrolyte for PICs. We have shown that using this electrolyte and applying a designed test protocol, it is possible to realize PICs with good capacity and cycling stability. The high performance is possible due to the high-rate capability of the graphite electrodes in the proposed electrolyte. Subsequent analysis of the electrodes reveals both structural changes of the graphite electrode and changes in the chemical composition of the AC and graphite electrode surfaces.

钾基储能系统在大功率应用领域（如钾离子电容器 (PIC)）展现出了巨大的应用潜力。在本研究中，我们介绍了一种含有 1,1,2,2- 四乙氧基乙烷 (TEG) 与碳酸丙烯酯 (PC) 和双氟磺酰亚胺钾 (KFSI) 的电解质作为 PIC 的电解质。我们已经证明，使用这种电解质并应用设计的测试协议，可以实现具有良好容量和循环稳定性的 PIC。之所以能实现高性能，是因为石墨电极在所提议的电解液中具有高速率能力。对电极的后续分析表明，石墨电极的结构发生了变化，交流电和石墨电极表面的化学成分也发生了变化。

引用次数: 0

Innovative application of flaxseeds nanopowder as supportive material with multiwalled carbon nanotubes for anode nanomodification in microbial fuel cell for boosting the energy recovery 亚麻籽纳米粉体与多壁纳米碳管作为支撑材料在微生物燃料电池阳极纳米改性中的创新应用，以提高能量回收率

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235927

Waad M.A. Abbas, Zainab Z. Ismail

In this experimental investigation, a novel application of flaxseeds nanopowder as a supportive material to MWCNTs for anode coating in dual-chamber MFC is investigated. Herein, four identically designed tubular enclosed dual-chamber MFCs are structured and run continually for 90 days. Actual hospital wastewater (HWW) is selected to fuel the MFCs. All MFCs are occupied with cylindrical graphite anode electrodes (GF), but at different coating conditions. Uncoated GF in MFC1, GF coated by pristine MWCNTs in MFC2, Functionalized MWCNTs (acid activated- MWCNTs) in MFC3, and functionalized MWCNTs mixed with flaxseeds nanopowder (functionalized MWCNTs/FNP) in MFC4. Efficiency of the MFCs is predestined based on the organic content (COD) removal from HWW and power output as well. The efficiencies of COD elimination are 79.86 %, 81.65 %, and 82.56 %, obtained in MFC1 and MFC2, MFC3, respectively, confirming that the efficiency values are relatively comparable in the three MFCs, whereby, higher efficiency up to 91.60 % is observed in MFC4. On the other hand, maximum power outputs of 454.71, 648.02, 807.41, and 1072.65 mW/m³ are observed MFC1, MFC2, MFC3, and MFC4, respectively indicating the potential of flaxseeds nanopowder to support the functionalized MWCNTs for COD elimination efficiency and maximizing power output.

本实验研究了亚麻籽纳米粉体作为 MWCNTs 的支持材料在双室 MFC 阳极涂层中的新应用。在此，我们构建了四个设计相同的管式封闭双室 MFC，并持续运行了 90 天。选择实际的医院废水（HWW）作为 MFC 的燃料。所有 MFC 都采用圆柱形石墨阳极电极（GF），但涂层条件不同。MFC1 中的 GF 未涂层，MFC2 中的 GF 涂层为原始 MWCNT，MFC3 中的 GF 涂层为功能化 MWCNT（酸活化 MWCNT），MFC4 中的 GF 涂层为与亚麻籽纳米粉体混合的功能化 MWCNT（功能化 MWCNT/FNP）。MFC 的效率是根据去除 HWW 中的有机物（COD）和输出功率来预测的。MFC1 和 MFC2、MFC3 的 COD 去除率分别为 79.86%、81.65% 和 82.56%，这表明三种 MFC 的效率值相对相当，其中 MFC4 的效率更高，达到 91.60%。另一方面，在 MFC1、MFC2、MFC3 和 MFC4 中观察到的最大功率输出分别为 454.71、648.02、807.41 和 1072.65 mW/m3，这表明亚麻籽纳米粉体在支持功能化 MWCNTs 以提高 COD 去除效率和最大功率输出方面具有潜力。

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引用次数: 0

Defective cerium-based metal-organic framework nanorod- reinforcing polymer electrolytes for lithium metal batteries 用于锂金属电池的缺陷铈基金属有机框架纳米棒强化聚合物电解质

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235914

Tingting Jiang , Xianhe Meng , Xiaoyu Hu , Anchun Tang , Zikang Ruan , Qiaoling Kang , Lijing Yan , Yue Zhao , Nengjun Yu , Bingyu Liu , Meiqiang Fan , Chubin Wan , Tingli Ma

Effective design of fillers can improve the performance of polymer electrolytes (PEs). Herein, this study introduces an innovative filler defect-structured cerium-based metal-organic framework (Ce-BTC) nanorods into Poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). These unique PEs with uniformly distributed fillers of nanocrystalline/amorphous cerium oxide (CeO₂) on Ce-BTC nanorods demonstrate a remarkable synergistic effect. This leads to more Li⁺ transport channels and better mechanical property, thereby elevating lithium-ion conductivity and promoting even lithium deposition and stripping. The experiment reveals that even with a mere 1 wt.% addition of CeO₂@Ce-BTC, the ionic conductivity of PEs reaches to 2.5 × 10⁻⁴ S cm⁻¹ at room temperature, and a high lithium-ion transference number improvement to 0.78, also obtains extended electrochemical voltage windows above 4.5 V and good flame retardancy. Using the designed gel polymer electrolytes (GPEs) with ionic conductivity up to 7.6 × 10⁻⁴ S cm⁻¹, the full Li/GPE/LiFePO₄ battery demonstrates an average coulombic efficiency of up to 99 % and maintains stable cycling performance (103.8 mAh g⁻¹ even after 100 cycles) at room temperature, reinforcing its promising application in practical battery systems.

有效设计填料可提高聚合物电解质（PE）的性能。本研究在聚偏氟乙烯-六氟丙烯（PVDF-HFP）中引入了一种创新的填充缺陷结构铈基金属有机框架（Ce-BTC）纳米棒。这些独特的聚乙烯在 Ce-BTC 纳米棒上均匀分布着纳米晶/无定形氧化铈（CeO2）填料，显示出显著的协同效应。这使得锂+传输通道更多，机械性能更好，从而提高了锂离子传导性，促进了锂的均匀沉积和剥离。实验表明，即使只添加 1 wt.%的 CeO2@Ce-BTC，室温下聚乙烯的离子电导率也能达到 2.5 × 10-4 S cm-1，锂离子转移数高达 0.78，还能获得 4.5 V 以上的扩展电化学电压窗口和良好的阻燃性。使用所设计的离子电导率高达 7.6 × 10-4 S cm-1 的凝胶聚合物电解质 (GPE)，全锂/GPE/LiFePO4 电池的平均库仑效率高达 99%，并能在室温下保持稳定的循环性能（100 次循环后仍能保持 103.8 mAh g-1），从而增强了其在实际电池系统中的应用前景。

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引用次数: 0

All-in-one dual-function porous materials derived from polyacrylonitrile for high-performance supercapacitor 用于高性能超级电容器的聚丙烯腈衍生多功能多孔材料

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235926

Xi Yang , Yongyun Mao , Jiyang Xie , Wanbiao Hu

Polyacrylonitrile (PAN)-based multifunctional energy storage materials have garnered significant interest in the research community. However, developing multifunctional PAN porous materials for integrated supercapacitors has encountered challenges such as low energy density, insufficient separator wettability, and limited ion conductivity. Herein, two types of versatile PAN-based dual-function porous membranes with varying pore sizes were fabricated using straightforward techniques involving solvent exchange and a directed freezing freeze-drying process. Subsequently, a high-performance-separator (POS) was developed by modifying pristine porous PAN with tetraethoxysilane (TEOS). Energy storage materials (CPAN-MnO₂) were fabricated by depositing MnO₂ onto the porous carbonised PAN (CPAN) surface through electrodeposition. The resulting structure, with CPAN-MnO₂ as the energy storage unit and POS as the separator, achieved an impressive ion conductivity of 32.2 mS cm⁻¹, super hydrophilicity, and high electrolyte uptake (456 %) and retention (302 %). A symmetric supercapacitor (SC) using CPAN-MnO₂ and POS demonstrated a maximum energy density of 163 μWh cm⁻² and exceptional cyclic stability, with 93.6 % capacitance retention after 10,000 cycles. This superior energy storage performance can be attributed to the TEOS-modified PAN porous channels, which enhance wettability with the electrolyte, improving electrolyte uptake and retention within the porous framework for ion exchange, thereby enhancing the electrochemical performance.

基于聚丙烯腈（PAN）的多功能储能材料已引起研究界的极大兴趣。然而，在开发用于集成超级电容器的多功能 PAN 多孔材料时，却遇到了能量密度低、分离器润湿性不足以及离子传导性有限等挑战。在此，我们采用溶剂交换和定向冷冻干燥工艺等简单技术，制备了两种不同孔径的多功能 PAN 双功能多孔膜。随后，通过使用四乙氧基硅烷（TEOS）对原始多孔 PAN 进行改性，开发出了一种高性能分离器（POS）。储能材料（CPAN-MnO2）是通过电沉积将 MnO2 沉积到多孔碳化 PAN（CPAN）表面而制成的。以 CPAN-MnO2 为储能单元，以 POS 为隔膜的结构实现了令人印象深刻的 32.2 mS cm-1 离子电导率、超亲水性、高电解质吸收率（456%）和电解质保持率（302%）。使用 CPAN-MnO2 和 POS 的对称超级电容器（SC）显示出 163 μWh cm-2 的最大能量密度和卓越的循环稳定性，10000 次循环后电容保持率为 93.6%。这种优异的储能性能可归功于 TEOS 改性的 PAN 多孔通道，它增强了与电解质的润湿性，改善了电解质的吸收和在多孔框架内的离子交换保留，从而提高了电化学性能。

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引用次数: 0

Enhancing the cycling stability of Ni-rich cathodes via dual-site modification induced by slight Ti-rich doping 通过轻微掺杂富钛诱导的双位点修饰提高富镍阴极的循环稳定性

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-26 DOI: 10.1016/j.jpowsour.2024.235913

Zhenhua Zhao , Yudong Zhang , Hongmei Cao , Yiyang Peng , Guoyu Ding , Yiyuan Hua , Jie Zhao , Can Cui , Saifang Huang

The Ni-rich cathode material LiNi_0.90Co_0.05Mn_0.05O₂ is a promising candidate for power lithium-ion batteries due to its high specific capacity. However, it suffers from inherent structural instability and severe interfacial side reactions, leading to rapid capacity degradation and thermal instability. In this study, we employed a slight Ti-rich doping strategy to enhance the structural and interfacial stability of the LiNi_0.90Co_0.05Mn_0.05O₂ cathode. The slight Ti-rich doping achieves dual-site modification (TM and Li), inhibits the anisotropic lattice changes, and improves the reversibility of electrochemical reactions. Additionally, it induces the formation of a Li₂TiO₃ coating on the particle surface, which inhibits interfacial side reactions, reduces the deposition of decomposition products, and enhances thermal stability. This strategy significantly improves the cycling stability of the LiNi_0.90Co_0.05Mn_0.05O₂ cathode, achieving a capacity retention rate of 94.4 % at 1C after 150 cycles. This effective approach paves the way for enhancing the electrochemical performance of Ni-rich cathodes.

富镍正极材料 LiNi0.90Co0.05Mn0.05O2 具有很高的比容量，是动力锂离子电池的理想候选材料。然而，它存在固有的结构不稳定性和严重的界面副反应，导致容量快速下降和热不稳定性。在本研究中，我们采用了轻微富钛掺杂策略来增强 LiNi0.90Co0.05Mn0.05O2 阴极的结构和界面稳定性。轻微的富钛掺杂实现了双位点修饰（TM 和 Li），抑制了各向异性的晶格变化，提高了电化学反应的可逆性。此外，它还诱导在颗粒表面形成了一层 Li2TiO3 涂层，从而抑制了界面副反应，减少了分解产物的沉积，并提高了热稳定性。这种策略大大提高了镍钴锰酸锂阴极的循环稳定性，在 150 个循环后，1C 下的容量保持率达到 94.4%。这种有效的方法为提高富镍阴极的电化学性能铺平了道路。

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引用次数: 0

Metalation of porphyrin units in a porous organic polymer stabilizing its anodic cycling performance in lithium-ion battery 多孔有机聚合物中卟啉单元的金属化可稳定其在锂离子电池中的阳极循环性能

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

Journal of Power Sources

Pub Date : 2024-11-25 DOI: 10.1016/j.jpowsour.2024.235909

Jingjing Fu, Jie Wang, Wen Yan, Songlin Cui, Tian Zhang, Fei Ye, Bo Liu

Organic materials have attracted tremendous interest as electrodes materials for lithium-ion battery, however, they still suffer from intractable problems including inherent low electronic conductivity, poor cycling stability and high solubility in electrolyte etc. Herein, a porphyrin-based porous organic polymer (POP) is employed to serve as anode material by virtue of its good insolubility, unique π-π interaction and abundant active sites. The POP electrode exhibits a high specific capacity of 584 mAh g⁻¹ at 100 mA g⁻¹ originated from fast redox activity while unfortunately undergoes a severe capacity fading during long-term cycles. It is found that the metalation of porphyrin moiety in POP by Ni²⁺ (Ni-POP) enables an excellent cycling stability of 380 mAh g⁻¹ with a capacity retention of 99 % for 500 cycles. We revealed that porphyrin unit is decomposed from the cleavage of the C-N/C=N bonds in porphyrin units, while Ni coordination stabilizes porphyrin units during fast redox process as affirmed by ex situ X-ray photoelectron spectroscopy. The easy fabrication, low-cost and excellent performance make Ni-POP great potential as anode material for lithium-ion battery.

有机材料作为锂离子电池的电极材料引起了人们的极大兴趣，然而，它们仍然存在着难以解决的问题，包括固有的低电子传导性、循环稳定性差以及在电解液中的高溶解性等。在本文中，卟啉基多孔有机聚合物（POP）凭借其良好的不溶性、独特的π-π相互作用和丰富的活性位点被用作负极材料。该 POP 电极在 100 mA g-1 的条件下可显示出 584 mAh g-1 的高比容量，这源于其快速的氧化还原活性。研究发现，用 Ni2+（Ni-POP）对 POP 中的卟啉分子进行金属化处理，可实现 380 mAh g-1 的优异循环稳定性，500 次循环的容量保持率为 99%。原位 X 射线光电子能谱证实，卟啉单元中的 C-N/C=N 键裂解分解了卟啉单元，而 Ni 配位在快速氧化还原过程中稳定了卟啉单元。Ni-POP 易于制造、成本低廉、性能优异，因此极有可能成为锂离子电池的负极材料。

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引用次数: 0