A polymeric artificial solid electrolyte interface dramatically enhances lithium-ion transport†

IF 4.3 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Chun Li , Bin Hu , Yujuan Wang , Kedong Bi
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引用次数: 0

Abstract

Coulombic efficiency and cycle life require further improvement in an ever-growing practical demand for lithium-ion batteries (LIBs), which are one of the most prevalent electrochemical energy storage systems. In this work, a more stable and highly lithium-ion (Li-ion) conductive artificial solid electrolyte interface (A-SEI) is constructed by coating polythiophene (PTh) on the surface of a graphite anode based on molecular dynamic simulations. Our findings reveal that PTh chains effectively prevent direct contact between the electrolyte and the negative electrode while providing a rapid transport channel for lithium ions (Li-ions), resulting in significantly shorter trapping times for Li-ions—at least two orders of magnitude shorter than those in the predominant component of traditional SEI layers.

Abstract Image

聚合物人造固体电解质界面显著增强了锂离子的传输能力
锂离子电池(LIB)是最普遍的电化学储能系统之一,其库仑效率和循环寿命需要进一步提高,以满足日益增长的实际需求。本研究基于分子动力学模拟,通过在石墨负极表面涂覆聚噻吩(PTH),构建了一种更稳定、锂离子(Li-ion)传导性更强的人工固体电解质界面(A-SEI)。我们的研究结果表明,PTH 链能有效阻止电解质与负极之间的直接接触,同时为锂离子(Li-ion)提供快速传输通道。对锂离子运动轨迹的分析表明,A-SEI 内部的锂离子跳跃传输机制促进了这一通道的形成,在这一过程中,锂离子与 PTh 链上的硫原子发生连续的去配位配位。这种跳跃机制大大缩短了锂离子的捕获时间--与传统 SEI 层的主要成分(如二碳酸乙烯)相比,至少缩短了两个数量级。本研究揭示了锂离子在作为 A-SEI 的 PTh 中的快速传输机制,为提高锂电池的库仑效率和循环寿命提供了巨大的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Chemical Communications
Chemical Communications 化学-化学综合
CiteScore
8.60
自引率
4.10%
发文量
2705
审稿时长
1.4 months
期刊介绍: ChemComm (Chemical Communications) is renowned as the fastest publisher of articles providing information on new avenues of research, drawn from all the world''s major areas of chemical research.
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