Stabilizing a High-Voltage Lithium-Rich Layered Oxide Cathode with a Novel Electrolyte Additive,ACS Applied Materials & Interfaces

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Stabilizing a High-Voltage Lithium-Rich Layered Oxide Cathode with a Novel Electrolyte Additive
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-07-17 00:00:00 , DOI: 10.1021/acsami.9b07441
Jianlian Lan , Qinfeng Zheng , Hebing Zhou , Jianhui Li , Lidan Xing , Kang Xu ₁ , Weizhen Fan ₂ , Le Yu ₂ , Weishan Li

Affiliation

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.

中文翻译：

用新型电解质添加剂稳定高压富锂分层氧化物阴极

我们报告了一种新型的电解质添加剂，双（三甲基甲硅烷基）碳二亚胺，可以有效地稳定高电压的富锂氧化物阴极。充电/放电测试表明，在锂基半电池或石墨基全电池中，即使在基线电解质中甚至微量的双（三甲基甲硅烷基）碳二亚胺也可显着改善该阴极的循环稳定性，在200次循环之间，其容量保持率介于0.5C下的2 V和4.8 V分别从40％增至72％和49％增至77％。使用物理特征和理论计算进行的分析表明，该添加剂不仅在阴极上形成了保护膜，而且还通过与氟化氢或质子的强配位作用消除了有害的氟化氢。

更新日期：2019-07-17

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