使用双电解质添加剂稳定高压Li‖LiCoO2电池的电极-电解质接口.
Jiwei Ding1, Chao Yang1, Wenxi Hu1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology Wuhan 430070 P. R. China youya@whut.edu.cn.
Chemical science
|July 4, 2025
概括
这项研究引入了一种基于化碳酸盐的新型电解质,具有双重添加剂 (DFEC和TMSPi) 来稳定金属电池. 新的电解质有效地抑制了树突和阴极降解,使高电压运行成为可能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 可充电金属电池提供高能量密度,但面临诸如树增长和高电位时阴极降解等挑战.
- 这些问题限制了高性能金属电池的实际应用和循环寿命.
研究的目的:
- 为高压金属电池开发先进的电解质系统.
- 用双电解质添加剂应对树形成和阴极降解的挑战.
主要方法:
- 一种基于碳酸盐的电解质的配方,使用*trans*-4,5-difluoro-1,3-dioxolan-2-one (DFEC) 和tri-(trimethylsilyl) 酸盐 (TMSPi) 作为双添加剂.
- 研究电解质对阳极的固体电解质接口 (SEI) 和LiCoO2阴极的阴极电解质接口 (CEI) 的影响.
- 电化学性能测试Li‖LiCoO2细胞使用开发的电解质在高上切断电压4.6V.
主要成果:
- 在阳极上,DFEC促进了稳定的SEI层,有效地抑制了树突的生长.
- 在LiCoO2阴极上,TMSPi促进了富含无机物CEI层的形成,抑制了溶解.
- LiCoO2电池的初始容量达到211.6 mAh g-1,并在200个周期以4.6V的电压后保持81.6%.
结论:
- 拟议的电解质与DFEC和TMSPi双添加剂成功地在阳极和阴极上构建稳定的接口.
- 这种先进的电解质使Li‖LiCoO2电池能够在高电压下运行,从而提高了循环寿命和容量保留.
- 这些发现为开发下一代电解质用于高能和高压金属电池提供了宝贵的见解.
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