对高压有机硫电解质的溶剂选择的关键见解
Michael A Dato1, Ziqi Liu2, Jeffrey Lopez2
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
ACS applied materials & interfaces
|August 22, 2025
概括
循环碳酸盐和特殊的硫溶剂如乙基硫可以改善高压电池的电解质. 这些配方通过优化被动化层来提高循环稳定性和减少容量损失.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 与碳酸盐系统相比,有机硫电解质对高压阴极具有更高的氧化稳定性.
- 然而,由于它们的粘度和阳极的不良被动化限制了充/放电率,因此需要添加剂.
- 循环碳酸盐 (CFC) 作为被动化剂来提高电解质性能.
研究的目的:
- 研究CFC在高压阴极应用中的电解质配方.
- 通过在电极表面形成有效的被动化接口来优化电解质性能.
- 确定高压电池系统中电解质兼容性的关键因素.
主要方法:
- 在CFC:硫:1,1,2,2-四乙烯-2,2,3,3-四乙烯 (TTE) 混合物中测试了1.2 M LiPF6的电解质配方.
- 使用LiNi0.8Mn0.1Co0.1O2 (FCG-NMC) 阴极和4.5V上切断电位的全电池配置.
- 分析了电解质阻力,容量损失和故障机制.
主要成果:
- 3-3-3-三烯碳酸盐 (TFPC) 和乙基甲基硫 (EMS) 的组合显示出最佳性能.
- 与商业电解质相比,TFPC/EMS电解质的电阻积累和容量损失较低.
- 乙烯碳酸盐 (FEC) 配方由于无足够的被动化而迅速丧失容量,尽管离子导电性较高.
结论:
- TFPC和EMS在提高循环稳定性和降低高压电解质中的细胞电阻方面是有效的.
- 精心选择被动化碳酸盐和硫溶剂对于提高电解质性能至关重要.
- 这项研究扩大了用于高压储能应用的先进电解质系统的可行性.
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