用于高性能硫电池的先进的自相分离电解质
Xu Yao1,2, Zhicheng Wang3,1, Suwan Lu4
1Tianmu Lake Institute of Advanced Energy Storage Technologies Co., Ltd., Liyang, 213300, China.
Angewandte Chemie (International ed. in English)
|September 25, 2025
概括
研究人员开发了一种用于硫 (Li-S) 电池的新型电解质. 这种设计促进了快速反应动力学,并通过为阳极和阴极反应创建不同的区域来防止性能下降,从而提高了电池的稳定性.
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) 电池具有高的理论能量密度,但由于聚硫化物 (LiPSs) 穿和缓慢的氧化还原动力学,其周期寿命较短.
- 优化硫利用和阳极稳定性仍然是实际Li-S电池应用的关键挑战.
研究的目的:
- 设计一种自相分离电解质,同时增强Li-S电池动力学并抑制LiPS的穿效应.
- 通过空间电解质分离,在Li-S电池中实现稳定的循环和高能量密度.
主要方法:
- 利用辅助溶剂 (1,2-dimethoxyethane和cyclopentyl甲基乙醇) 来诱导基于LiPSs溶解特征的自发电解质相分离.
- 设计了一种双区域电解质系统,在阴极和阳极具有不同的溶解强度.
- 制造并测试了具有高硫载荷和薄阳极的单层和多层Li-S袋式电池.
主要成果:
- 自相分离的电解质成功地在阴极上创建了一个强溶解区域,用于快速动力学,并在阳极上创建了一个弱溶解区域,用于稳定的固体电解质间相 (SEI) 形成.
- 在单层袋细胞中,在170个循环中实现了稳定的循环运行,使用4.3mg_{s}$ cm$^{-2}$硫载荷和50μmLi阳极.
- 演示了1.8Ah多层袋式电池,提供323Wh kg$^{-1}$的能量密度,在稀缺电解质条件下,在50个周期内稳定循环.
结论:
- 拟议的自相分离电解质策略有效地解决了Li-S电池中硫氧化还原动力学和阳极界面稳定性之间的权衡.
- 这种双区域协同机制为开发高性能和持久的金属硫电池提供了有希望的途径.
- 这些发现为提高硫电池技术的实际应用提供了可行的解决方案.
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