碳酸乙烯酯
化学
电解质
碳酸二甲酯
热分解
库仑法
锂(药物)
无机化学
杂质
锂离子电池
碳酸盐
分解
电池(电)
甲醇
电化学
有机化学
电极
物理化学
功率(物理)
内分泌学
物理
医学
量子力学
作者
Patricia Handel,Gisela Fauler,Katja Kapper,Martin Schmuck,Christoph Stangl,Roland C. Fischer,F. Uhlig,Stefan Koller
标识
DOI:10.1016/j.jpowsour.2014.05.080
摘要
Thermal degradation products in lithium-ion batteries result mainly from hydrolysis sensitivity of lithium hexafluorophosphate (LiPF6). As organic carbonate solvents contain traces of protic impurities, the thermal decomposition of electrolytes is enhanced. Therefore, resulting degradation products are studied with nuclear magnetic resonance spectroscopy (NMR) and gas chromatography mass spectrometry (GC–MS). The electrolyte contains 1 M LiPF6 in a binary mixture of ethylene carbonate (EC) and diethylene carbonate (DEC) in a ratio of 1:2 (v/v) and is aged at ambient and elevated temperature. The impact of protic impurities, either added as deionized water or incorporated in positive electrode material, upon aging is investigated. Further, the influence of different housing materials on the electrolyte degradation is shown. Difluorophosphoric acid is identified as main decomposition product by NMR-spectroscopy. Traces of other decomposition products are determined by headspace GC–MS. Acid–base and coulometric titration are used to determine the total amount of acid and water content upon aging, respectively. The aim of this investigation is to achieve profound understanding about the thermal decomposition of one most common used electrolyte in a battery-like housing material.
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