Study on the Property and Mechanism of Organic Electrolyte Additive for Lithium Ion Batteries

Abstract

近年来,锂离子电池用有机电解液添加剂受到了人们极大关注,它具有用量少、几乎不增加电池成本但却能显著提高电池多方面性能的优良特点。例如,抑制电解液的分解和改善电池的循环性能、高/低温性能、安全性能等。 添加剂从作用功能上可分为SEI膜优化剂、过充电保护添加剂、阻燃添加剂、提高电解液电导率的添加剂和控制电解液中水和酸含量的添加剂等。 本文综述了锂离子电池及所用主要材料的研究进展,并以EC基电解液为基础电解液,在其中添加了一种SEI膜优化剂氟代碳酸乙烯酯(FEC),比较了添加剂添加前后对电池性能的影响并对FEC的作用机理进行了研究讨论。本文首先利用量子化学原理通过Gaussian03软件计算比较...Since the additives have been used to organic electrolytes for lithium ion batteries, which are becoming more and more important for energy storage. The additives attract many concerns due to its obvious functions, for example, suppressing electrolyte decomposition, improving cyclability, high/low temperature performance and safety of lithium ion batteries, and so on. According to their functions...学位:理学硕士院系专业:化学化工学院化学系_无机化学学号:1912005130179

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