期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 14, 期 1, 页码 47-50出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.10.026
关键词
Lithium ion batteries; Hydrofluoric acid; Spectroscopic ellipsometry; LiPF6 degradation
资金
- German Ministry of Education and Research (BMBF) within the research alliance [03X4601A, LIB2015]
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231]
Spectroscopic ellipsometry was used to study the time-dependent formation of HF upon the thermal degradation of LiPF6 at 50 degrees C in a lithium ion battery electrolyte containing ethylene carbonate and diethyl carbonate. The generated HF was monitored by following the etching rate of a 300 nm thick SiO2 layer, grown on both sides of a silicon wafer substrate, as a function of the immersion time in the electrolyte at 50 C degrees. It was found that the formation of HF starts after 70 h of exposure time and occurs following several different phases. The amount of generated HF was calculated using an empirical formula correlating the etching rate to the temperature. Combining the results of the HF formation with literature data, a simplified mechanism for the formation of the HF involving LiPF6 degradation, and a simplified catalytical reaction pathway of the formed HF and silicon dioxide are proposed to describe the kinetics of HF formation. (C) 2011 Elsevier B.V. All rights reserved.
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