期刊
ELECTROCHIMICA ACTA
卷 102, 期 -, 页码 133-141出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.03.171
关键词
LiFSI; Safety; Thermal analysis; Lithium-ion battery; SEI
资金
- Region de Picardie
- FEDER through the DEGAS project
Lithium bis(fluorosulfonyl) imide (LiFSI) is regarded as an alternative to the classical LiPF6 salt in today's LiFePO4/graphite-based Li-ion batteries electrolyte owing to its slightly higher conductivity and lower fluorine content. In an attempt to better evaluate the safety issues, here we report the comparative study of the LiFSI and LiPF6 based electrolyte/lithiated graphite interface thermal behavior. DSC measurements with LiFSI-based electrolyte reveal a sharp exotherm with large heat release though at higher onset and peak temperatures compared to LiPF6-based electrolyte. With the help of GC/MS, F-19 NMR and ESI-HRMS analyses, we assume that this highly energetic peak around 200 degrees C, which is dependant upon the lithium content, is mainly related to electrochemical reduction of FSI- anion. In a strategy to limit the probability and damage of thermal runaway event, electrolyte additives such as vinylene carbonate (VC), fluoro ethylene carbonate (FEC), di-isocyanato hexane (DIH) and toluene di-isocyanate (TDI) have been investigated and shown to significantly lower the energy associated with the exothermic phenomenon. (c) 2013 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据