硫化物全固态锂金属电池的原位碳纳米管负载有机阴极

IF 15 1区 工程技术 Q1 ENERGY & FUELS
Fengmei Song , Zhixuan Wang , Guochen Sun , Tenghuan Ma , Dengxu Wu , Liquan Chen , Hong Li , Fan Wu
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引用次数: 0

摘要

有机阴极具有资源丰富、理论比容量高、合成条件温和等优点,但密度低、导电性差、在液体电解质中溶解度高。本文开发了一种原位涂覆方法,通过实现具有有机Li4C8H2O6阴极的高性能硫化物全固态电池来克服上述问题。系统研究了含碳纳米管(CNTs)和气相生长碳纤维(VGCF)的Li4C8H2O6复合阴极,发现CNTs能有效提高硫化物电解质的电导率、倍率性能和活性材料利用率,但能加速硫化物电解质的电化学分解。因此,在碳纳米管上原位涂覆Li4C8H2O6(Li4C8H2O6@CNT)以进一步改善Li4C8H2O6与CNT之间的接触,但减少CNT与硫化物固体电解质的接触及其分解。因此Li4C8H2O6@CNT电极表现出200.3mAh/g的高容量和高活性材料利用率(0.1C时为83.4%)。在40wt%的高阴极负载和1C的高倍率下,它还表现出85.9mAh/g的比容量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In-situ CNT-loaded organic cathodes for sulfide all-solid-state Li metal batteries

Organic cathodes show promising advantages of extensive resources, high theoretical specific capacity, and mild synthesis conditions, etc., but suffer from low density, poor electronic conductivity, and high solubility in liquid electrolytes. Herein, an in-situ coating method is developed to overcome the above issues by realizing high-performance sulfide all-solid-state batteries with organic Li4C8H2O6 cathode. Li4C8H2O6 composite cathodes with carbon nanotubes (CNTs) and vapor grown carbon fiber (VGCF) were systematically studied to reveal that CNTs accelerate the electrochemical decomposition of sulfide electrolyte, despite the effectively improved electronic conductivity, rate capability and active material utilization. Therefore, in-situ coating of Li4C8H2O6 onto CNTs (Li4C8H2O6@CNT) is developed to further improve the contact between Li4C8H2O6 and CNTs, but to reduce the contact of CNTs with sulfide solid electrolyte and its decomposition. As a result, the Li4C8H2O6@CNT electrode demonstrates a high capacity of 200.3 mAh/g, and a high active material utilization rate (83.4% at 0.1C). It also exhibits a specific capacity of 85.9 mAh/g at a high cathode loading of 40 wt% and a high rate of 1C.

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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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