The reactions of lithium ion battery electrolyte (LiPF 6 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 0.5 Mn 1.5 O 4 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 CO 2 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 + ).
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Xu et al. (2014) studied this question.
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