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Urea-aided phase change thermal energy storage performance regulation for thermal management 用于热管理的尿素辅助相变热能储存性能调节技术
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-18 DOI: 10.1016/j.est.2024.114678
Long Geng, Yabo Yan, Yitong Cao, Guo Li, Changhui Liu
Organic phase change cold storage materials show significant potential in various fields, including cold chain transportation, food and drug preservation, and battery thermal management. However, most organic phase change cold storage materials struggle with issues like difficult temperature control and flammability, which severely limit their application and development. In this study, by physically blending a modulated urea solution and alcohol with the polyethylene glycol lauryl ester (PLE), and adjusting the mass of urea and alcohol, a series of samples are prepared. Detailed characterization and analysis reveal that the prepared phase change materials (PCMs) possess excellent cold storage properties. These materials achieve precise control of melting temperatures ranging from −13.42 to −3.80 °C, with a maximum latent heat of melting of 85.12 J/g. Interestingly, this study reveals that seven groups of samples exhibit flame retardant effects. These properties are critical for enhancing the safety and efficiency of the materials in practical applications. This innovative approach not only addresses the temperature control and flammability issues but also expands the potential use of PCMs in various industries. Therefore, this study offers an effective method for developing advanced phase change cold storage materials, contributing to technological advancements in thermal management.
有机相变蓄冷材料在冷链运输、食品和药品保鲜以及电池热管理等多个领域显示出巨大潜力。然而,大多数有机相变蓄冷材料都存在温度难以控制、易燃等问题,严重限制了其应用和发展。本研究通过物理方法将调制好的尿素溶液和酒精与聚乙二醇月桂醇酯(PLE)混合,并调整尿素和酒精的质量,制备了一系列样品。详细的表征和分析表明,制备的相变材料(PCM)具有优异的冷藏性能。这些材料的熔化温度可精确控制在 -13.42 至 -3.80 °C 之间,最大熔化潜热为 85.12 J/g。有趣的是,这项研究还发现七组样品具有阻燃效果。这些特性对于提高材料在实际应用中的安全性和效率至关重要。这种创新方法不仅解决了温度控制和易燃性问题,还拓展了 PCM 在各行各业的潜在用途。因此,这项研究为开发先进的相变蓄冷材料提供了一种有效方法,有助于热管理领域的技术进步。
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引用次数: 0
A novel photovoltaic-thermoelectric hybrid system with an anisotropic shape-stale phase change composites 具有各向异性形状陈旧相变复合材料的新型光伏-热电混合系统
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-18 DOI: 10.1016/j.est.2024.114676
Wenshuang Tian, Xiong Zheng, Yang Xiao, Guangzhao Qin
Photovoltaic (PV) power generation technology is currently one of the most effective ways in solar energy utilization, while current PV panels are facing a serious issue of electrical efficiency reduction and potential structural damage caused by the accumulated heat during operation. To solve this issue, we proposed a novel hybrid system containing PV cell, thermoelectric generation (TEG) module, and phase change composite (PCC), which can achieve a power enhancement of 29.8 % compared with individual PV cell. The fabricated chitosan-based PCC has a high anisotropy degree of 4.10 and melting enthalpy of 133.2 kJ·kg−1, which promote the effective heat transport and storage between PV cell and TEG module, and the excellent mechanical strength and thermal stability ensures its long-term endurance. Owing to excellent thermal properties of the PCC, not only the power of PV cell is increased by 55.9 mW, but the TEG module also continuously outputs 4.1 mW of power. Besides, the hybrid system can produce 5.185 kW·h·m−2 electricity per day in the actual environment. Looking ahead, the integration of advanced materials and hybrid systems like the PV + PCC + TEG approach holds great promise for further enhancing solar energy efficiency and sustainability in real-world applications.
光伏(PV)发电技术是目前最有效的太阳能利用方式之一,但目前的光伏电池板面临着电能效率降低和运行过程中积聚的热量可能导致结构损坏的严重问题。为解决这一问题,我们提出了一种包含光伏电池、热发电(TEG)模块和相变复合材料(PCC)的新型混合系统,与单个光伏电池相比,该系统的功率可提高 29.8%。所制备的壳聚糖基 PCC 各向异性度高达 4.10,熔化焓为 133.2 kJ-kg-1,可促进光伏电池和 TEG 模块之间有效的热量传输和存储,其优异的机械强度和热稳定性确保了其长期耐久性。由于 PCC 优异的热性能,不仅光伏电池的功率增加了 55.9 mW,TEG 模块也持续输出了 4.1 mW 的功率。此外,该混合系统在实际环境中每天可产生 5.185 kW-h-m-2 电力。展望未来,先进材料与混合系统(如 PV + PCC + TEG 方法)的整合将为在实际应用中进一步提高太阳能效率和可持续性带来巨大希望。
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引用次数: 0
Multifunctional cu-Cu3P heterojunction embedded in hierarchically porous carbon nanofibers to strengthen adsorption and catalytic effects based on built-in electric field for liS cell 嵌入分层多孔碳纳米纤维的多功能铜铟镓硒异质结,基于内置电场增强 liS 电池的吸附和催化效应
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-18 DOI: 10.1016/j.est.2024.114638
Chunhua Zhu, Yayi Lu, Yanan Li, Hao Wang, Fan Zhang, Yongbing Jin, Bowen Cheng, Nanping Deng, Weimin Kang
Lithium sulfur batteries (LSBs) are considered a highly promising next-generation battery system. However, severe shuttle effect and slow redox kinetics of lithium polysulfides (LiPSs) in LSBs are still the main obstacles hindering their rapid developments. In this study, the multifunctional Cu-Cu3P heterojunction nanoparticles embedded in hierarchically porous carbon nanofibers (PCNFs) are designed and prepared for modifying separator of LSBs. The highly conductive metal Cu and PCNFs can synergistically enhance the conductivity of electrons and ions, and physically suppress “shuttle effect” of lithium LiPSs. Meanwhile, based on the spontaneous built-in electric field at the formed heterogeneous interfaces of Cu-Cu3P, the heterojunction also can chemically adsorb LiPSs and greatly catalyze conversion of LiPSs, thus further suppressing the “shuttle effect” and excellent reaction kinetics of LiPSs. Based on these merits, the assembled LSBs using the heterojunction Cu-Cu3P@PCNFs modified separator show outstanding initial specific discharge capacities up to 1009.2 mAh g−1 at 1C and 998.5 mAh g−1 at 2C, and stable cycling with an average capacity decay rate of 0.067 % and 0.084 % at 1C during 800 cycles and at 2C during 580 cycles, respectively. Even at a high sulfur loading of 2.5 mg cm−2, an excellent specific discharge capacity of 784.6 mAh g−1 after 180 cycles 0.5C still can be realized. The work provides a novel perspective on understanding adsorption and catalytic design in energy storage equipment based on heterojunction engineering and built-in electric field.
锂硫电池(LSB)被认为是一种极具潜力的下一代电池系统。然而,多硫化锂(LiPSs)在 LSBs 中严重的穿梭效应和缓慢的氧化还原动力学仍然是阻碍其快速发展的主要障碍。本研究设计并制备了嵌入分层多孔碳纳米纤维(PCNFs)的多功能 Cu-Cu3P 异质结纳米粒子,用于改性 LSBs 的隔膜。高导电性金属铜和 PCNFs 能协同增强电子和离子的导电性,从物理上抑制锂离子电池的 "穿梭效应"。同时,基于 Cu-Cu3P 异质界面的自发内置电场,异质结还能化学吸附锂离子,极大地催化锂离子的转化,从而进一步抑制锂离子的 "穿梭效应",并获得优异的反应动力学性能。基于这些优点,使用异质结 Cu-Cu3P@PCNFs 改性隔膜组装的 LSB 在 1C 和 2C 条件下分别表现出了高达 1009.2 mAh g-1 和 998.5 mAh g-1 的初始比放电容量,并且循环稳定,在 1C 条件下 800 次循环的平均容量衰减率为 0.067 %,在 2C 条件下 580 次循环的平均容量衰减率为 0.084 %。即使硫含量高达 2.5 mg cm-2,在 0.5C 循环 180 次后仍能实现 784.6 mAh g-1 的出色比放电容量。这项研究为理解基于异质结工程和内置电场的储能设备中的吸附和催化设计提供了一个新的视角。
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引用次数: 0
Nickel foam supported CuO/Co3O4/r-GO is used as electrode material for non-enzymatic glucose sensors and high performance supercapacitors 将镍泡沫支撑的 CuO/Co3O4/r-GO 用作非酶葡萄糖传感器和高性能超级电容器的电极材料
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-18 DOI: 10.1016/j.est.2024.114603
Bairui Tao , Xiaoyan Feng , Fengjuan Miao
In order to solve the problem of glucose detection in medical development and meet the urgent demand for new energy storage devices, this paper proposes a new material suitable for glucose sensing and capacitive properties. The sensor was fabricated by depositing Co3O4 nanoparticles onto nickel foam with integrated r-GO via the hydrothermal method, followed by the synthesis of CuO nanoparticles using electroplating. The detection range of the sensor is 0.3–11.3 mM. The sensor's sensitivity is 1000.3 μA mM−1 cm−2, indicating its responsiveness to changes in analyte concentration. In electrochemical test systems, Signal-to-Noise Ratio (SNR) usually represents the relative intensity of the effective current signal and the background noise, reflecting the accuracy and reliability of the measurement. When the SNR is three, the minimum detection limit is 0.431 μM, highlighting its ability to reliably detect analytes at low concentrations amidst background noise. According to electrochemical workstation tests, the sensor demonstrates robust stability. Furthermore, the electrode material proves suitable for asymmetric supercapacitor devices, when the current density is 2 Ag−1, the specific capacitance is 660.5 Fg−1. At the same time, we also explore the cyclic stability of the device, which can retain 92.3 % of its initial specific capacitance after 5000 cycles, showing its remarkable long-term stability. In addition, the prepared nanocomposites can also light the red LED light. The results show that the synthesized CuO/Co3O4/r-GO/NF electrode can be used for electrochemical glucose sensing and supercapacitors, and plays an important role as a multi-functional material in the fields of medical, food, electronics, transportation and energy, providing key technical support for a variety of applications.
为了解决医疗发展中的葡萄糖检测问题和满足对新型储能器件的迫切需求,本文提出了一种适合葡萄糖传感和电容特性的新材料。通过水热法将 Co3O4 纳米粒子沉积到集成了 r-GO 的泡沫镍上,然后用电镀法合成 CuO 纳米粒子,制备出了传感器。传感器的检测范围为 0.3-11.3 mM。传感器的灵敏度为 1000.3 μA mM-1 cm-2,表明其对分析物浓度变化的反应灵敏。在电化学测试系统中,信噪比(SNR)通常表示有效电流信号与背景噪声的相对强度,反映了测量的准确性和可靠性。当信噪比为 3 时,最低检测限为 0.431 μM,突出了其在背景噪声中可靠检测低浓度分析物的能力。根据电化学工作站测试,该传感器具有很强的稳定性。此外,当电流密度为 2 Ag-1 时,比电容为 660.5 Fg-1。同时,我们还探讨了该装置的循环稳定性,5000 次循环后,其比电容仍能保持 92.3%,显示出其显著的长期稳定性。此外,所制备的纳米复合材料还能点亮红色 LED 灯。结果表明,合成的 CuO/Co3O4/r-GO/NF 电极可用于电化学葡萄糖传感和超级电容器,作为一种多功能材料在医疗、食品、电子、交通和能源等领域发挥着重要作用,为多种应用提供了关键技术支撑。
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引用次数: 0
Sugar gourd-like amorphous carbon coated CoS/Co9S8 nanoparticles anchored on carbon nanotubes for potassium-ion batteries 锚定在碳纳米管上的糖葫芦状无定形碳包覆 CoS/Co9S8 纳米粒子用于钾离子电池
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114641
Yue Liu, Zhigang Liu
Transition metal sulfides (TMSs) with high theoretical capacity have been recognized as potential anode materials for potassium ion batteries (PIBs). However, TMSs undergo strong volume changes during charge/discharge, which can be solved by combining with carbon materials and rational structural design. Herein, sugar gourd-like amorphous carbon coated CoS/Co9S8 nanoparticles anchored on carbon nanotubes (CoS/Co9S8/CNTs-C) are prepared by constructing novel nanostructures. The amorphous carbon-coated layer as the “sugar coating” acts as a fixation to mitigate the volume expansion and agglomeration of the CoS/Co9S8 nanoparticles, while the carbon nanotubes as a support provide a robust framework that enhances conductivity, resulting in composites with strong structural stability and outstanding electrochemical performance. With the benefit of the unique sugar gourd-like structure, the CoS/Co9S8/CNTs-C-0.2 composites exhibit favorable cycling stability at 100 mA g−1 with 331.7 mAh g−1 after 500 cycles and impressive rate performance (653.7 mAh g−1 at 50 mA g−1 and 367.9 mAh g−1 at 2000 mA g−1). Moreover, density functional theory calculations indicate that the improved electrochemical reaction kinetics of CoS/Co9S8/CNTs-C comes from the stronger adsorption energy for K+. Furthermore, CoS/Co9S8/CNTs-C-0.2 exhibits favorable electrochemical performance in full cells, which proved the significance of its practical applications.
具有高理论容量的过渡金属硫化物(TMSs)已被认为是钾离子电池(PIBs)的潜在阳极材料。然而,过渡金属硫化物在充放电过程中会发生强烈的体积变化,这可以通过与碳材料结合和合理的结构设计来解决。本文通过构建新型纳米结构,制备了锚定在碳纳米管(CoS/Co9S8/CNTs-C)上的糖葫芦状非晶碳涂层 CoS/Co9S8纳米粒子。作为 "糖衣 "的无定形碳涂层起到了固定作用,可减轻 CoS/Co9S8 纳米粒子的体积膨胀和团聚,而作为支撑的碳纳米管则提供了增强导电性的稳固框架,从而使复合材料具有很强的结构稳定性和出色的电化学性能。借助独特的糖葫芦状结构,CoS/Co9S8/CNTs-C-0.2 复合材料在 100 mA g-1 下表现出良好的循环稳定性,500 次循环后的电导率为 331.7 mAh g-1,并且具有令人印象深刻的速率性能(50 mA g-1 时为 653.7 mAh g-1,2000 mA g-1 时为 367.9 mAh g-1)。此外,密度泛函理论计算表明,CoS/Co9S8/CNTs-C 电化学反应动力学的改善来自于 K+ 更强的吸附能。此外,CoS/Co9S8/CNTs-C-0.2 在全电池中表现出良好的电化学性能,这证明了它的实际应用意义。
{"title":"Sugar gourd-like amorphous carbon coated CoS/Co9S8 nanoparticles anchored on carbon nanotubes for potassium-ion batteries","authors":"Yue Liu,&nbsp;Zhigang Liu","doi":"10.1016/j.est.2024.114641","DOIUrl":"10.1016/j.est.2024.114641","url":null,"abstract":"<div><div>Transition metal sulfides (TMSs) with high theoretical capacity have been recognized as potential anode materials for potassium ion batteries (PIBs). However, TMSs undergo strong volume changes during charge/discharge, which can be solved by combining with carbon materials and rational structural design. Herein, sugar gourd-like amorphous carbon coated CoS/Co<sub>9</sub>S<sub>8</sub> nanoparticles anchored on carbon nanotubes (CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C) are prepared by constructing novel nanostructures. The amorphous carbon-coated layer as the “sugar coating” acts as a fixation to mitigate the volume expansion and agglomeration of the CoS/Co<sub>9</sub>S<sub>8</sub> nanoparticles, while the carbon nanotubes as a support provide a robust framework that enhances conductivity, resulting in composites with strong structural stability and outstanding electrochemical performance. With the benefit of the unique sugar gourd-like structure, the CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C-0.2 composites exhibit favorable cycling stability at 100 mA g<sup>−1</sup> with 331.7 mAh g<sup>−1</sup> after 500 cycles and impressive rate performance (653.7 mAh g<sup>−1</sup> at 50 mA g<sup>−1</sup> and 367.9 mAh g<sup>−1</sup> at 2000 mA g<sup>−1</sup>). Moreover, density functional theory calculations indicate that the improved electrochemical reaction kinetics of CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C comes from the stronger adsorption energy for K<sup>+</sup>. Furthermore, CoS/Co<sub>9</sub>S<sub>8</sub>/CNTs-C-0.2 exhibits favorable electrochemical performance in full cells, which proved the significance of its practical applications.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"104 ","pages":"Article 114641"},"PeriodicalIF":8.9,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662395","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
Multifunctional benzoselenadiazole-capped organic molecule-based nanohybrid for efficient asymmetric supercapacitor and oxygen evolution reaction 用于高效不对称超级电容器和氧进化反应的多功能苯并硒二唑封端有机分子纳米杂化物
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114604
Devraj Singh , Lalita Wagh , Apurba K. Das
Nanostructured hybrid materials have attracted significant interest in the field of energy storage and conversion. To investigate the effect of all nanohybrids on electrochemical properties, we have synthesized organic-inorganic nanohybrids through in situ galvanostatic electrodeposition using a monometallic and bimetallic composition of nickel, cobalt salts and an organic molecule. The electrochemical studies reveal that BSeFY/NCDH (20:20) (BSe = benzo[2,1,3]selenadiazole, F = L-phenylalanine and Y = L-tyrosine; NCDH = nickel‑cobalt double hydroxide) hybrid electrode performs more efficiently than 40:0, 0:40, 10:30, 30:10 and nickel‑cobalt double hydroxide-20:20 (NCDH-20:20) electrodes. The specific capacitance of the 20:20 hybrid electrode is measured to be 1338.46 F/g at 2 A/g current density. The AC/NF negative electrode was made using activated carbon, carbon black and polyvinylidene fluoride (PVDF) in a ratio of 80:15:5. The fabricated asymmetric device reveals the energy density of 35.48 Wh/kg at a power density 751.36 W/kg. Furthermore, the device exhibits a capacitance retention of 91.24 % after 5000 cycles at 7 A/g current density. This fabricated device has the ability to illuminate a red LED and operate a small fan. Furthermore, the designed and fabricated hybrid materials are highly efficient for the oxygen evolution reaction (OER). Among the fabricated materials, the 20:20 hybrid electrode is highly active and achieves a lower overpotential of 240 mV with a low Tafel slope of 62 mV/dec at a current density of 10 mA/cm2. Furthermore, the BSeFY/NCDH (20,20) hybrid is highly robust and shows negligible activity loss after 55 h of chronopotentiometry measurement at 10 mA/cm2 current density. Furthermore, multistep chronopotentiometry was performed in the current density range of 4 to 40 mA/cm2 and the results exhibit that the potential rapidly levels off in the next 400 s due to the robust electrochemical stability, rapid mass and electron transportation ability of 20:20 nanohybrid. Therefore, the electrochemical investigations demonstrate that the bimetallic organic-inorganic nanohybrid is highly active in supercapacitor and OER due to its abundant electrochemical active sites, high conductivity, enhanced Faradaic redox properties, multiple valence transitions and the easy synergistic effect between metal ions and organic moiety.
纳米结构杂化材料在能量存储和转换领域引起了极大的兴趣。为了研究所有纳米杂化材料对电化学性能的影响,我们利用镍、钴盐和有机分子的单金属和双金属成分,通过原位电静电沉积合成了有机-无机纳米杂化材料。电化学研究表明,BSeFY/NCDH(20:20)(BSe = 苯并[2,1,3]硒二唑,F = L-苯丙氨酸,Y = L-酪氨酸;NCDH = 镍钴双氢氧化物)混合电极比 40:0、0:40、10:30、30:10 和镍钴双氢氧化物-20:20(NCDH-20:20)电极更有效。在电流密度为 2 A/g 时,20:20 混合电极的比电容为 1338.46 F/g。AC/NF 负极是用活性炭、炭黑和聚偏氟乙烯(PVDF)按 80:15:5 的比例制成的。制造出的不对称装置的能量密度为 35.48 Wh/kg,功率密度为 751.36 W/kg。此外,在电流密度为 7 A/g 的情况下,该器件在 5000 次循环后的电容保持率为 91.24%。这种制备的器件能够点亮红色发光二极管,并驱动一个小型风扇。此外,设计和制备的混合材料在氧进化反应(OER)中具有很高的效率。在制备的材料中,20:20 混合电极具有很高的活性,在电流密度为 10 mA/cm2 时,过电位较低,为 240 mV,塔菲尔斜率较低,为 62 mV/dec。此外,BSeFY/NCDH(20,20)杂交电极具有很高的稳定性,在 10 mA/cm2 电流密度下进行 55 小时的计时电位测量后,活性损失可以忽略不计。此外,还在 4 至 40 mA/cm2 的电流密度范围内进行了多步计时电位计测量,结果表明,由于 20:20 纳米杂化物具有强大的电化学稳定性、快速质量和电子传输能力,其电位在接下来的 400 秒内迅速趋于平稳。因此,电化学研究表明,双金属有机-无机纳米杂化物具有丰富的电化学活性位点、高导电性、增强的法拉第氧化还原特性、多种价态转变以及金属离子和有机分子之间的易协同效应,因此在超级电容器和 OER 中具有很高的活性。
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引用次数: 0
Binder-free LiNi0.8Mn0.1Co0.1O2 electrode enabled by single-walled carbon nanotube coating for Li-ion batteries 通过单壁碳纳米管涂层实现锂离子电池的无粘结剂 LiNi0.8Mn0.1Co0.1O2 电极
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114627
Alisa R. Bogdanova, Filipp A. Obrezkov, Eldar M. Khabushev, Xiangze Kong, Tanja Kallio
Herein, we report a solvent-free preparation procedure for a binder-free LiNi0.8Mn0.1Co0.1O2 (NCM811 or NMC811) positive electrode consisting of only 0.2 wt% single-walled carbon nanotubes (SWCNTs) and 99.8 wt% NCM811. SWCNTs form a three-dimensional conductive network within NCM811 particles, facilitating electron transfer across the NCM811 electrode, while maintaining high content of the active material. The binder-free NCM811-SWCNT electrode provides a high discharge specific capacity of ~190 mAh g−1 at 0.2C current rate retaining 38 % more of the initial capacity than a conventional electrode after 200 charge-discharge cycles at 1C. Electrochemical techniques such as operando X-ray diffraction and dilatometry has been applied for the first time to gain a deeper understanding of binder-free electrode structure evolution induced by electrochemical transformations. The data obtained demonstrates a good agreement between macroscopic and microscopic parameters changes for a NCM-SWCNT electrode.
在此,我们报告了一种无粘结剂 LiNi0.8Mn0.1Co0.1O2(NCM811 或 NMC811)正极的无溶剂制备方法,该电极仅由 0.2 wt% 的单壁碳纳米管 (SWCNT) 和 99.8 wt% 的 NCM811 组成。单壁碳纳米管在 NCM811 颗粒内形成三维导电网络,促进电子在 NCM811 电极上的转移,同时保持高含量的活性材料。不含粘合剂的 NCM811-SWCNT 电极在 0.2C 电流速率下可提供约 190 mAh g-1 的高放电比容量,与传统电极相比,在 1C 电流速率下充放电循环 200 次后,仍能保持 38% 的初始容量。为了更深入地了解电化学变化引起的无粘结剂电极结构演变,我们首次应用了操作性 X 射线衍射和扩张测量等电化学技术。所获得的数据表明,NCM-SWCNT 电极的宏观和微观参数变化之间存在良好的一致性。
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引用次数: 0
Flexible electrospun porous carbon nanofiber@PEG phase change nanofibrous membrane for advanced solar-/electro-thermal energy conversion and storage 用于先进太阳能/电热能量转换和储存的柔性电纺多孔碳纳米纤维@PEG 相变纳米纤维膜
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114608
Huaijia Jing , Tao Chen , Wenqi Shao , Chen Ma, Rongyan Ji, Jin Zhang, Jing Hu, Qianqian Liu, Tao Wei, Ruirui Wang, Wanfei Li, Miao Cheng, Bo Liu
Flexible phase change materials (PCMs) showed great application prospects in the field of thermal management of flexible electronic devices and wearable devices, nevertheless, their development was seriously hindered by the intrinsic solid rigidity, liquid leakage and lack of functionality of PCMs. Herein, a multifunctional flexible leakage-proof composite PCM (named PCNF@PEG) was fabricated, in which poly(ethylene glycol) (PEG) was encapsulated in robust flexible porous carbon nanofibers (PCNFs) derived from electrospun polyacrylonitrile/polystyrene (PAN/PS) composite nanofibers. The as-prepared PCNF@PEG showed excellent flexibility, shape stability, satisfactory phase change performance with melting/freezing latent heat of 71.9/70.9 J g−1 and prominent thermal reliability after 100 thermal cycles. Moreover, the thermal conductivity of PCNF@PEG was noticeably enhanced by 45 % compared to pure PEG. Significantly, the interconnect carbon nanofiber matrix endowed PCNF@PEG unprecedented solar-/electro-thermal energy conversion performance and cycle stability. Therefore, the fabricated PCNF@PEG with pronounced comprehensive performance is a promising candidate for advanced thermal management applications in flexible devices.
柔性相变材料(PCMs)在柔性电子设备和可穿戴设备的热管理领域具有广阔的应用前景,但其固有的固态刚性、液体泄漏和功能性不足等问题严重阻碍了其发展。本文制备了一种多功能柔性防漏复合 PCM(名为 PCNF@PEG),将聚乙二醇(PEG)封装在由电纺聚丙烯腈/聚苯乙烯(PAN/PS)复合纳米纤维制成的坚固柔性多孔碳纳米纤维(PCNF)中。所制备的 PCNF@PEG 具有优异的柔韧性、形状稳定性和令人满意的相变性能(熔化/冷冻潜热分别为 71.9/70.9 J g-1),并且在 100 次热循环后具有显著的热可靠性。此外,与纯 PEG 相比,PCNF@PEG 的热导率明显提高了 45%。值得注意的是,互连碳纳米纤维基质赋予了 PCNF@PEG 前所未有的太阳能/电热能量转换性能和循环稳定性。因此,制备的 PCNF@PEG 具有明显的综合性能,是柔性设备中先进热管理应用的理想候选材料。
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引用次数: 0
Understanding particle size effect on fast-charging behavior of graphite anode using ultra-thin-layer electrodes 利用超薄层电极了解粒度对石墨负极快速充电行为的影响
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114521
Mei Luo , Aleksandar S. Mijailovic , Guanyi Wang , Qingliu Wu , Brian W. Sheldon , Wenquan Lu
Extreme fast charging (≤15 min) of lithium-ion batteries is highly desirable to accelerate mass-market adoption of electric vehicles. However, significant capacity fading, as well as safety issues due to the lithium plating caused by the fast charging rate, limit its implementation. In this study, we investigated the fast-charging capability of graphite materials with various particle sizes. To eliminate the Li+ ion concentration gradient effect across the thickness of the electrode, ultra-thin-layer graphite electrodes were developed to investigate the “real” fast-charging capability of graphite at the particle level. Electrochemical assessments as well as microscopic characterizations revealed that smaller particles exhibited superior fast-charging performance, featuring enhanced capacity reversibility, faster charging rate, and less lithium plating under the same fast-charging conditions. It is shown that small-particle graphite (mean radius of 3.3 μm) could withstand a 4C charge (to 80 % state-of-charge) without plating, with minimal plating occurring at 6C. Thicker particles exhibited plating at lower C-rates. Since the experimental data could not directly explain whether intra-particle diffusion limitations or interfacial reaction limitations dominated the plating mechanism, the pseudo-2-dimensional model was used to evaluate the most likely plating mechanism. The model suggested that particle-level diffusion is the dominant mechanism contributing to plating at high rates. This work provides comprehensive insights into the particle size effects on fast-charging capability, offering a better understanding of fast-charging behavior and valuable guidance for designing optimal electrode architecture for high-rate lithium-ion batteries.
锂离子电池的极快速充电(≤15 分钟)是加速电动汽车大规模市场应用的理想选择。然而,由于快速充电导致的容量衰减以及锂镀层引起的安全问题,限制了其实施。在本研究中,我们研究了不同粒度石墨材料的快速充电能力。为了消除电极厚度上的锂离子浓度梯度效应,我们开发了超薄层石墨电极,以研究石墨在颗粒级别上的 "真实 "快速充电能力。电化学评估和显微特性分析表明,在相同的快速充电条件下,更小的颗粒表现出更优越的快速充电性能,具有更高的容量可逆性、更快的充电速度和更少的锂镀层。研究表明,小颗粒石墨(平均半径为 3.3 μm)可以承受 4C 充电(达到 80% 的充电状态)而不产生电镀,在 6C 时电镀现象极少。较厚的颗粒在较低的 C 速率下会出现电镀现象。由于实验数据无法直接解释电镀机制是由颗粒内扩散限制还是界面反应限制所主导,因此采用了伪二维模型来评估最可能的电镀机制。该模型表明,颗粒级扩散是导致高速率电镀的主要机制。这项研究全面揭示了颗粒尺寸对快速充电能力的影响,从而更好地理解了快速充电行为,并为设计高倍率锂离子电池的最佳电极结构提供了宝贵的指导。
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引用次数: 0
Tween 80-assisted synthesis of high conductivity silicon‑carbon composites as anode materials for high-performance lithium-ion batteries 吐温 80 辅助合成高导电率硅碳复合材料,作为高性能锂离子电池的负极材料
IF 8.9 2区 工程技术 Q1 ENERGY & FUELS Pub Date : 2024-11-17 DOI: 10.1016/j.est.2024.114569
Fangfang Zhao , Ruixian Tang , Liming Yu , Lei Ma , Liangming Wei
High-theoretical-capacity silicon anodes are critically hindered by huge volume expansion and poor conductivity. Silicon‑carbon composites can effectively enhance the electrode lifetime, but their preparation often suffers from particle aggregation issues. Here, the eco-friendly Tween 80 dispersant is introduced for the first time to assist in synthesizing Si/EG-C-TW80 submicron composites. The resulting Si/EG-C-TW80 exhibits well-dispersed and uniformly coated particles, effectively mitigating electrode expansion and maintaining structural stability. Meanwhile, the increased proportion of graphene-type carbon in the carbon layer effectively improves its conductivity. Batteries with the Si/EG-C-TW80 electrode demonstrate an excellent reversible capacity (1985.8 mAh g−1 at 0.2 A g−1) and high rate capability (933 mAh g−1 at 4 A g−1), in addition, deliver a high specific capacity of 566 mAh g−1 after 500 cycles at 4 A g−1. Furthermore, the LFP||Si/EG-C-TW80 full cell shows superior specific discharge capacities of 140 mAh g−1. This easily scalable and environmentally friendly synthesis method offers great promise for the widespread application of silicon in energy storage systems.
高理论容量硅阳极因巨大的体积膨胀和较差的导电性而受到严重阻碍。硅碳复合材料能有效提高电极的使用寿命,但其制备过程往往会遇到颗粒聚集的问题。本文首次引入了环保型吐温 80 分散剂来帮助合成硅/EG-C-TW80 亚微米复合材料。所得到的 Si/EG-C-TW80 颗粒分散良好、涂层均匀,可有效缓解电极膨胀并保持结构稳定。同时,碳层中石墨烯类碳比例的增加有效提高了其导电性。使用 Si/EG-C-TW80 电极的电池具有出色的可逆容量(0.2 A g-1 时为 1985.8 mAh g-1)和高倍率能力(4 A g-1 时为 933 mAh g-1),此外,在 4 A g-1 下循环 500 次后,比容量高达 566 mAh g-1。此外,LFP||Si/EG-C-TW80 全电池的比放电容量高达 140 mAh g-1。这种易于扩展且环保的合成方法为硅在储能系统中的广泛应用提供了巨大前景。
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Journal of energy storage
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