Generation of Cathode Passivation Films via Oxidation of Lithium Bis(oxalato) Borate on High Voltage Spinel (LiNi0.5Mn1.5O4)

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• 作者：Mengqing Xu ; Nikolaos Tsiouvaras ; Arnd Garsuch ; Hubert A. Gasteiger ; Brett L. Lucht
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 10, 2014
• 年：2014
• 卷：118
• 期：14
• 页码：7363-7368
• 全文大小：458K
• 年卷期：v.118,no.14(April 10, 2014)
• ISSN：1932-7455

文摘

The reactions of lithium ion battery electrolyte (LiPF₆ in ethylene carbonate/ethyl methyl, EC/EMC, 3:7 v/v) with and without added lithium bis(oxalato) borate (LiBOB) on the surface of high voltage LiNi_0.5Mn_1.5O₄ cathodes has been investigated via a combination of electrochemical measurements, in situ gas analysis, and ex situ surface analysis. The oxidation of LiBOB on the cathode results in the generation of CO₂ and a cathode passivation film containing borate oxalates. The cathode passivation film inhibits oxidation of the bulk electrolyte at high potential (>4.8 V vs Li/Li⁺).