期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 164, 期 14, 页码 A3699-A3701出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0691714jes
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We demonstrate that lithium/silicon monoxide (SiO) cell failure can be hindered by utilizing a Lewis-basic tris(2,2,2-trifluoroethyl) phosphite (TTFP), as an electrolyte additive. In the absence of TTFP, the solid electrolyte interphase (SEI) on the SiO electrode is attacked by Lewis-acidic phosphorus pentafluoride (PF5) generated by thermal decomposition of lithium hexafluorophosphate (LiPF6) at moderately elevated temperature. The SEI damage is followed by electrolyte decomposition/film deposition on the damaged electrode surface causing film growth, which leads to severe cell polarization and eventual failure. Conversely, effective PF5 scavenging by TTFP through Lewis acid-base adduct formation decreases SEI damage and thus hinders cell failure. (c) 2017 The Electrochemical Society. All rights reserved.
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