Liu Qiuyan, Yang Gaojing, Li Shuwei, Zhang Simeng, Chen Renjie, Wang Zhaoxiang, Chen Liquan
Key Laboratory for Renewable Energy, Chinese Academy of Sciences, Beijing Key Laboratory for New Energy Materials and Devices, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100190, China.
ACS Appl Mater Interfaces. 2021 May 12;13(18):21459-21466. doi: 10.1021/acsami.1c04389. Epub 2021 Apr 27.
The lack of electrolyte that is stable under high potentials hinders the application of high-voltage cathode materials for lithium batteries; the introduction of electrolyte additives is clearly the most effective solution to address this issue. Herein, we investigated the synergistic effects of trimethyl borate (TMB) in two dual-additive electrolytes on protecting the LiNiCoMnO and LiCoO cathode materials under high potentials. The interactions of TMB with fluoroethylene carbonate and the catalysis of the decomposition product of TMB to tetramethylene sulfone lower the onset oxidation potential of these additives and are beneficial in forming a stable cathode electrolyte interphase film on the cathode materials. This work sheds light on another way of electrolyte designing for high-voltage cathode materials.
缺乏在高电位下稳定的电解质阻碍了锂电池高压正极材料的应用；引入电解质添加剂显然是解决这一问题的最有效方法。在此，我们研究了硼酸三甲酯（TMB）在两种双添加剂电解质中对高电位下LiNiCoMnO和LiCoO正极材料的协同保护作用。TMB与氟代碳酸乙烯酯的相互作用以及TMB分解产物对四亚甲基砜的催化作用降低了这些添加剂的起始氧化电位，并有利于在正极材料上形成稳定的正极电解质界面膜。这项工作为高压正极材料的电解质设计提供了另一种思路。
