通过限制[N]{SO2F) 2的含量来提高Li-S电池的性能,在一个基于硫的节约溶解电解质中
Jiali Liu1, Shanglin Li2, Nao Nomura2
1Advanced Chemical Energy Research Center, Institute of Advanced Sciences, Yokohama National University, Yokohama 240-8501, Japan.
ACS applied materials & interfaces
|February 8, 2024
概括
研究人员通过控制固体电解质接口 (SEI) 膜和沉积,提高了硫电池的寿命. 升高的初始充电温度提高了的可逆性和袋式电池的循环性能.
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 (Li-S) 电池具有高能量密度,但由于阳极的不稳定性和树突的形成,其寿命很短.
- 在电解质中的二 (Li[FSA]) 可以形成富含无机固体电解质间相 (SEI) 膜,稳定阳极.
- 聚硫化物 (LiPSs) 和[FSA]离子之间的副作用限制了Li-S电池中基于Li[FSA]的电解质的有效性.
研究的目的:
- 研究SEI组成和形态对Li-S电池阳极可逆性的影响.
- 优化电解质设计和初始充电条件,以提高Li-S电池的循环性能.
主要方法:
- 使用了一种LiPS节制溶解电解质,含有受控的,受限制的Li [FSA].
- 在初始充电过程中实施高温,以影响SEI形成和沉积.
- 在优化条件下的实际Li-S袋式电池中评估阳极可逆性和循环性能.
主要成果:
- 通过控制SEI组成和形态,通过控制SEI组成和形态,实现了阳极可逆性的显著增强.
- 优化的电解质和初始充电策略减轻了有害的副作用.
- 在实用的Li-S袋式电池中展示了增强的循环性能,表明电池寿命有所改善.
结论:
- 通过电解质设计和热管理控制SEI膜组成和形态,对于Li-S电池的性能至关重要.
- 在限制Li[FSA]含量的LiPS稀疏溶解电解质中,初始充电温度升高有效地提高了的可逆性.
- 这些发现为提高Li-S电池循环性能提供了可行的策略,尽管电解质开发存在挑战.
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