电解质
材料科学
阴极
锂(药物)
碳二亚胺
石墨
氧化物
无机化学
化学工程
氟化氢
氢
复合材料
电极
物理化学
有机化学
高分子化学
化学
冶金
内分泌学
工程类
医学
作者
Jianlian Lan,Qinfeng Zheng,Huifang Zhou,Jianhui Li,Lidan Xing,Kang Xu,Weizhen Fan,Le Yu,Weishan Li
标识
DOI:10.1021/acsami.9b07441
摘要
We report a novel electrolyte additive, bis(trimethylsilyl)carbodiimide, that effectively stabilizes high-voltage lithium-rich oxide cathode. Charge/discharge tests demonstrate that even trace amounts of bis(trimethylsilyl)carbodiimide in a baseline electrolyte improve the cycling stability of this cathode significantly, either in Li-based half cells or graphite-based full cells, where the capacity retention after 200 cycles between 2 and 4.8 V at 0.5C is enhanced from 40 to 72% and 49 to 77%, respectively. Analyses using physical characterization and theoretical calculations reveal that this additive not only builds a protective film on the cathode but also eliminates detrimental hydrogen fluoride via its strong coordination with hydrogen fluoride or protons.
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