利用线性氟化碳酸酯的消除反应将钴酸锂阴极的电压稳定在 4.6 V 以下

IF 27.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Siyu Zhou, Jixiang Yang, Cheng Zhen, M. Danny Gu, Minhua Shao
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引用次数: 0

摘要

在锂离子电池(LIB)中,如何在高电压下稳定钴酸锂(LCO)阴极仍然是一项挑战。虽然含氟溶剂因其卓越的抗氧化性而被用于高压系统中,但线性含氟碳酸盐在高压下仍会发生消除反应,产生腐蚀性物质,损害电极材料。本研究通过加入以三(三甲基硅基)为基础的添加剂来解决三氟乙基碳酸甲酯(FEMC)的消除反应问题,从而构建出一种均匀、坚固的富含聚合物的阴极-电解质中间相(CEI)。由于在优化电解质中加入了亚磷酸三(三甲基硅)酯,以 LCO 为阴极的纽扣电池在 4.6 V 的高截止电压下循环 500 次后,容量仍能保持在 95%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Utilizing the Elimination Reaction of Linear Fluorinated Carbonate to Stabilize LiCoO2 Cathode up to 4.6 V

Utilizing the Elimination Reaction of Linear Fluorinated Carbonate to Stabilize LiCoO2 Cathode up to 4.6 V
Stabilizing LiCoO2 (LCO) cathode at high voltages is still challenging in lithium-ion batteries (LIBs). Although fluorinated solvents are utilized in high-voltage systems for their superior oxidation resistance, linear fluorinated carbonates still undergo elimination reactions at high voltages, producing corrosive substances that compromise electrode materials. This study addresses the elimination reaction of methyl trifluoroethyl carbonate (FEMC) by incorporating tris(trimethylsilyl)-based additives, thereby constructing a homogeneous and robust polymer-rich cathode-electrolyte interphase (CEI). With the incorporation of tris(trimethylsilyl)phosphite in the optimized electrolyte, the capacity of the coin cell with LCO as the cathode can maintain 95% after 500 cycles with a high cut-off voltage of 4.6 V. This study establishes a foundational framework for employing linear fluorocarbonates in high-voltage systems and provides innovative insights into CEI design and construction.
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来源期刊
Advanced Materials
Advanced Materials 工程技术-材料科学:综合
CiteScore
43.00
自引率
4.10%
发文量
2182
审稿时长
2 months
期刊介绍: Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.
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