Tris (pentafluorophenyl) phosphine (TPFPP) is used as an electrolyte additive to improve the cycling performance of high voltage (~ 5 V) lithium-ion battery. The electrochemical behaviors and surface chemistry of LiNi_0.5Mn_1.5O₄ are investigated via cyclic voltammetry, chronoamperometry, charge–discharge test, X-ray photoelectron spectroscopy, and theoretical computations. It is found that the cycling performance of the cell Li/LiNi_0.5Mn_1.5O₄, using an electrolyte of 1.0 M LiPF₆ in ethylene carbonate/dimethyl carbonate/diethyl carbonate (1/1/1, in volume), can be improved by adding TPFPP into the electrolyte. The theoretical calculations predict that TPFPP is preferably oxidized compared to the solvents. Electrochemical measurements and XPS analyses show that a protective film is formed on LiNi_0.5Mn_1.5O₄ when TPFPP is used, which contributes to the cycling performance improvement of the cell.

三（五氟苯基）膦（TPFPP）用作电解质添加剂可改善高压（〜5 V）锂离子电池的循环性能。通过循环伏安法，计时电流法，充放电试验，X射线光电子能谱和理论计算研究了LiNi _0.5 Mn _1.5 O ₄的电化学行为和表面化学。发现使用1.0 M LiPF ₆的电解质，Li / LiNi _0.5 Mn _1.5 O ₄电池的循环性能碳酸亚乙酯/碳酸二甲酯/碳酸二乙酯（体积为1/1/1）中的碳原子数可以通过在电解质中添加TPFPP来改善。理论计算预测，与溶剂相比，TPFPP优选被氧化。电化学测量和XPS分析表明，当使用TPFPP时，在LiNi _0.5 Mn _1.5 O ₄上会形成保护膜，这有助于改善电池的循环性能。