We report N-(triphenylphosphoranylidene) aniline (TPPA) as a new electrolyte additive for high performance lithium cobalt oxide (LiCoO₂) electrodes during high voltage operations. When cycled in the voltage range of 3.0–4.4 V, graphite-LiCoO₂ full cells with 0.2 wt% TPPA exhibited 10% increased discharge capacities after 200 cycles compared to those of control cells with no such additive. The enhanced cycling performance is attributed to the additive effect toward the modified surface films on LiCoO₂ electrodes that suppress the decomposition of both solvent and salt in the electrolyte. This additive effect was characterized by electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS).

我们报告了N-（三苯基正膦亚基）苯胺（TPPA）作为高压操作中高性能锂钴氧化物（LiCoO ₂）电极的新型电解质添加剂。当在3.0–4.4 V的电压范围内循环时，与不含此类添加剂的对照电池相比，具有0.2 wt％TPPA的石墨-LiCoO ₂充满电池在200个循环后的放电容量增加了10％。循环性能的提高归因于对LiCoO ₂电极上的改性表面膜的累加效应，从而抑制了电解质中溶剂和盐的分解。这种累加效应通过电化学阻抗谱（EIS）和X射线光电子能谱（XPS）来表征。