In this study we characterize 4-(trimethylsilyl) morpholine (TMSML) as a multifunctional electrolyte additive in Li1.03(Ni0.5Mn0.3Co0.2)0.97O2 (NMC532)//Graphite cells operating at 3–4.4 V. This additive completely prevents the hydrolysis of LiPF6 caused by traces of water in a carbonate electrolyte, both ex and in situ. It also inhibits oxidative decomposition of electrolyte on the energized cathode, impedes the formation of electrically insulating deposits on the cathode surface, decreases transition metal loss from the cathode in aged cells, improves the discharge capacity retention, and decreases the rise of cell resistance during aging. We trace these beneficial functions to the ease of nucleophilic substitution and the N–Si bond dissociation in the TMSML. Our results suggest that TMSML could be a promising electrolyte additive in the high voltage lithium ion batteries.

中文翻译：

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4-（三甲基甲硅烷基）吗啉作为高压锂离子电池中的多功能电解质添加剂

在这项研究中，我们将 4-（三甲基甲硅烷基）吗啉（TMSML）表征为 Li1.03(Ni0.5Mn0.3Co0.2)0.97O2 (NMC532)//石墨电池中的多功能电解质添加剂，在 3–4.4 V 下运行。这种添加剂完全防止由碳酸盐电解质中的微量水引起的 LiPF6 水解，无论是原位还是原位。它还抑制带电阴极上电解质的氧化分解，阻止阴极表面电绝缘沉积物的形成，减少老化电池中阴极的过渡金属损失，提高放电容量保持率，并降低老化过程中电池电阻的上升. 我们将这些有益的功能追溯到 TMSML 中亲核取代的容易程度和 N-Si 键解离。