Extending the High-Voltage Operation of Graphite/NCM811 Cells by Constructing a Robust Electrode/Electrolyte Interphase Layer

作者：Wengao Zhao, Kuan Wang, R. Dubey, F. Ren, Enzo Brack, M. Becker, R. Grissa, L. Seidl, F. Pagani, Konstantin Egorov, K. Kravchyk, M. Kovalenko, Pengfei Yan, Yong Yang, C. Battaglia · 发表于：Materials Today Energy · 年份：2023 · DOI：10.1016/j.mtener.2023.101301 · 被引用次数：24

hexa ﬂ uorophosphate (LiPF 6 ) in ethylene carbonate and ethylene methyl carbonate (ethylene carbonate:ethylene methyl carbonate ¼ 3:7 vol% þ 2% vinylene carbonate). Although the initial capacity reaches 190 mAh/g, the capacity retention after 300 cycles to 4.5 V is only 66%. Employing a combination of tris(trimethylsilyl) phosphite and lithium di ﬂ uoro(oxalato)borate as electrolyte additives, we demonstrate excellent capacity retention of 85% after 300 cycles to 4.5 V. Moreover, graphite/LiNi 0 $ 8 Co 0 $ 1 Mn 0 $ 1 O 2 cells with additives show improved capacity retention also at elevated temperatures of 60 (cid:3) C. A detailed post-mortem analysis reveals the formation of a compact and LiF-rich and B-containing cathode/electrolyte interphase layer on the LiNi 0 $ 8 Co 0 $ 1 Mn 0 $ 1 O 2 particles cycled with tris(trimethylsilyl)phosphite and lithium di ﬂ uoro(oxalato)borate additives, substantially suppressing the transition metal dissolution and the cation-disordered layer formation on the exposed particles' surface.