可充电电池实现高电压和高利用的碳酸基电解质
Kang Zhou1, Gaopan Liu1, Xiaomeng Yu1
1Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai 200433, China.
Journal of the American Chemical Society
|March 21, 2024
概括
一种新的碳酸基电解质与一种新盐 (Zn(BHFip) 2) 提高了电池的性能. 这种电解质改善了的利用,并使充满电池的高电压运行成为可能.
科学领域:
- 电化学
- 材料科学
背景情况:
- 电池中的水性电解质具有有限的电化学窗口,并受到演变的影响,阻碍了高压性能.
- 碳酸 Ester 具有较高的阳极稳定性,但与盐的溶解性相抗争,限制了它们在金属电池中的使用.
研究的目的:
- 开发一种使用碳酸盐的高性能电解质,用于金属电池.
- 为了克服盐在 aprotic 溶剂中的可溶性限制.
主要方法:
- 以碳酸为基础的电解质 (EC:DMC:EMC) 与一种新的盐,二胺 (Zn(BHFip) 的配方.
- 研究电解质的特性,包括盐的溶解性和界面行为.
- 测试Zn//Zn对称细胞和完整细胞 (Zn//LiMn2O4,Zn//LiNi0.5Mn1.5O4),以评估性能.
主要成果:
- 新型Zn(BHFip) 2盐在碳酸电解质中具有很好的溶解性.
- 电解质在阳极上促进导电性Zn2+固体电解质间相 (SEI) 和保护性阴极电解质间相 (CEI) 的形成.
- 在125小时内实现了91%的利用率. 在1. 7V和高压操作超过2.2V时,全电池显示稳定循环.
结论:
- 建议使用碳酸基电解质Zn ((BHFip) 2) 显著提高金属电池的性能.
- 这种电解质系统通过提高阳极利用率和接口稳定性,为高压电池提供了有前途的解决方案.
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