Ethylene glycol bis (propionitrile) ether (EGBE) is used as an electrolyte additive to improve the cycling stability and rate capability of Li/Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cells at high operating voltage (4.8 V). After 150 cycles, cells with 1.0 wt% of EGBE containing electrolyte have remarkable cycling performance, 89.0% capacity retention; while the cells with baseline electrolyte only remain 67.4% capacity retention. Linear sweep voltammetry (LSV) and computation results demonstrate that EGBE preferably oxidizes on the cathode surface compared to the LiPF₆/carbonate electrolyte. In order to further understand the effects of EGBE on Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode upon cycling at high voltage, electrochemical behaviors and ex-situ surface analysis of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ are investigated via electrochemical impedance spectroscopy (EIS), scanning electron spectroscopy (SEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and inductive coupled plasma spectroscopy (ICP-MS). The improved cycling performance can be attributed to more stable and robust surface layer yield via incorporation of EGBE, which mitigates the oxidation of electrolyte on the cathode electrode, and also inhibits the dissolution of bulk transition metal ions as well upon cycling at high voltage.

乙二醇双（丙腈）醚（EGBE）用作电解质添加剂，可改善Li / Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂电池在高工作电压（4.8 V）下的循环稳定性和倍率性能。150次循环后，含有1.0 wt％含EGBE的电解质的电池具有出色的循环性能，容量保持率为89.0％。而具有基线电解质的电池仅保留67.4％的容量保留率。线性扫描伏安法（LSV）和计算结果表明，与LiPF ₆ /碳酸盐电解质相比，EGBE优选在阴极表面上氧化。为了进一步了解EGBE对Li _1.2 Mn _{0.54的影响}Li _1.2 Mn _0.54 Ni _0.13 Co _0.13 O ₂在高压下循环时的Ni _0.13 Co _0.13 O ₂阴极，电化学行为和非原位表面分析通过电化学阻抗谱（EIS），扫描电子谱（SEM），X射线光电子能谱（XPS），透射电子显微镜（TEM）和电感耦合等离子体能谱（ICP-MS）进行了研究。循环性能的提高可归因于通过掺入EGBE可以实现更稳定，更稳固的表面层产量，这可以减轻电解质在阴极电极上的氧化，并在高压下循环时也可以抑制大量过渡金属离子的溶解。