在局部高度电解质中量身定制溶解溶剂,用于的电解质
Ju-Myung Kim1, Peiyuan Gao2, Qiushi Miao3
1Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States.
ACS applied materials & interfaces
|April 15, 2024
概括
研究人员通过在局部高度电解质中替换溶剂来改进硫电池. 这提高了硫化聚烯二阴极稳定性和阳极性能,提高了电池的寿命和效率.
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:
- 硫化聚烯 (SPAN) 在硫 (Li-S) 电池中提供了减少的聚硫化物溶解.
- 传统的电解质与金属阳极不稳定,阻碍了Li-S电池的开发.
- 局部高度电解质 (LHCEs) 显示出稳定阳极的潜力.
研究的目的:
- 通过优化LHCEs来增强LHESPAN电池性能.
- 在LHCE中用1,2-二甲基乙 (DME) 替换为1,2-二甲基乙 (DEE) 的效果.
- 在高温下提高阴极和阳极的稳定性.
主要方法:
- 合成并描述了一个基于DEE的新型LHCE.
- 通过在45°C的电化学循环使用评估LiidiyeSpan电池性能.
- 使用各种技术分析了电极材料和接口.
主要成果:
- 该DEE-LHCE显示与Li2S2的反应性降低,并减轻了多硫化物溶解.
- 在SPAN阴极上观察到改善的阴极-电解质相间形成.
- 配备DEE-LHCE的SPAN电池在45°C的300个循环后实现了82.9%的容量保留,表现优于DME-LHCE.
结论:
- 在LHCE中用DEE取代DME,显著提高了LHCE电池的性能和稳定性.
- 优化的DEE-LHCE促进了SPAN阴极的结构可逆性,并抑制了Li阳极体积变化.
- 在LHCE中量身定制溶解剂是改善各种可充电电池系统的可行策略.
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