具有中度聚硫化物溶解性的电解质,用于高性能,长日历寿命的硫电池
Xin Gao1, Zhiao Yu2,3, Jingyang Wang1
1Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305.
概括
在电解质中适度的聚硫化物可溶性可以提高硫电池的性能. 新的化电解质显示出更好的容量和循环寿命,克服了以前的限制.
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:
- 硫 (Li-S) 电池具有高能量密度,但由于聚硫化物 (LiPS) 穿,其循环稳定性不佳.
- 现有的策略往往侧重于尽量减少LiPS溶解度,这可能阻碍反应动力学.
研究的目的:
- 为了研究LiPS溶解度对Li-S电池性能的影响.
- 开发新的电解质,优化LiPS的溶解性,以提高稳定性和动力学.
主要方法:
- 系统地探索不同LiPS溶解度 (371,100 mM) 的电解质.
- 单溶剂,单盐,标准盐度与中度LiPSs可溶性电解质 (SMILEs) 的配方,使用化溶剂.
- 在不同的条件下,对具有设计电解质的Li-S电池的性能评估.
主要成果:
- 发现Li-S电池的最佳LiPS溶解度处于50200mM的中等范围.
- 化电解质,特别是F4DEE-SMILE和F4DMB-SMILE,表现出卓越的性能.
- 在60°C的0.05°C下,F4DMB-SMILE在0.2°C的150个循环中实现了1526mAhg-1的功率,并在30天的老化后显示出4.3%的容量恢复.
结论:
- 适度的LiPS溶解度对于平衡穿效应和Li-S反应动力学至关重要.
- 化中小企业是先进Li-S电池的有前途的电解质类别.
- 与传统选项相比,开发的电解质显著改善了周期寿命和日历老化.
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