电解质
碳酸乙烯酯
热稳定性
碳酸二乙酯
化学工程
相间
锂(药物)
热分解
石墨
电极
材料科学
碳酸二甲酯
化学
溶解
无机化学
有机化学
甲醇
物理化学
生物
工程类
遗传学
医学
内分泌学
作者
Ho Seok Park,Taeho Yoon,Junyoung Mun,Ji Heon Ryu,Jae Jeong Kim,Seung M. Oh
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2013-01-01
卷期号:160 (9): A1539-A1543
被引量:38
摘要
A comparative study is made on thermal stability of two solid electrolyte interphase (SEI) films on a graphite negative electrode. The SEI films are generated by reductive decomposition of two different electrolyte solutions that are prepared by dissolving either lithium hexafluorophosphate (LiPF6) or lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) in ethylene carbonate/diethyl carbonate solvent. The surface film derived from the LiTFSI-containing electrolyte, which is enriched by organic carbon-oxygen species with uniform coverage, remains rather intact in both chemical composition and film morphology after high-temperature (85°C) storage, indicative of a superior thermal stability. As a result, this SEI layer maintains its passivating ability even after the storage. In contrast, the film generated from the LiPF6-containing electrolyte is thermally degraded with a substantial change in both film morphology and chemical composition to lose its passivating ability upon high-temperature exposure. The poorer thermal stability of the latter film has been ascribed to a high population of Li- and F-containing inorganic species and presence of cracks or void spaces in the SEI layer.
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