通过在以为基础的电解质中捕获有机分子中间体来调节阳极的SEI组件
Xin Li1,2, Pan Xu1,2, Hongbin Ni1,2
1State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Xiamen University, Engineering Research Centre of Electrochemical Technologies of Ministry of Education, Xiamen, Fujian, 361005, China.
Small methods
|June 15, 2023
概括
一种新型的电解质添加剂,2--1,3-二甲基利米达二酸 (CDIH),通过形成保护性固体电解质介相 (SEI) 膜来稳定金属阳极. 这大大提高了离子电池的性能和寿命.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属阳极对于高能量密度电池至关重要,但在以为基础的电解质中面临着状物生长和不稳定的固体电解质介相 (SEI) 的挑战.
- 控制SEI组成是实现稳定的金属阳极的关键,但积极调整这些组件仍然很困难.
研究的目的:
- 引入一种功能性电解质添加剂,2--1,3-二甲基利米达素六酸 (CDIH),以调节以为基础的电解质中的SEI成分.
- 为了提高金属阳极的稳定性和可逆性,以提高电池性能.
主要方法:
- 在乙烯碳酸盐 (FEC) /乙烯碳酸盐 (PC) 电解质中加入CDIH添加剂.
- 利用分子动态模拟和实验分析来研究SEI的形成和组成.
- 测试NavigationBot对称细胞和NavigationBot完整细胞以评估电化学性能.
主要成果:
- CDIH添加剂通过将化物与FEC分解产物反应,促进形成富含NaF/NaCl的SEI层.
- CDIH有效捕获有机中间体,减少SEI内部不稳定的有机成分.
- 纳基基体的对称细胞表现出优异的长期循环 (>800小时) 和速率性能 (0.5-4mA cm-2).
- 完全的PB细胞表现出了出色的电化学性能,极化最小.
结论:
- CDIH添加剂成功调节了SEI的组成,导致高度可逆的沉积.
- 这一策略显著提高了以为基础的电解质中的金属阳极的循环稳定性和速率能力.
- 开发的方法为推进离子电池技术提供了一个有前途的途径.
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