用于Li-S电池的溶解剂电解质设计:通过相位分离抑制穿效应
Changyu Yeo1, Seungyeop Kang2, Yun-Jeong Lee3
1Department of Electronic Materials Engineering, Kwangwoon University, 60 Gwangun-ro 1-gil, Nowon-gu, Seoul, 01897, Republic of Korea.
Advanced materials (Deerfield Beach, Fla.)
|November 5, 2025
概括
研究人员通过使用辅助溶剂开发了一种用于硫电池的新电解质. 这种策略抑制了聚硫化物穿效应,改善了无需不活性添加剂的电池循环稳定性.
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和低成本,使其成为下一代能源存储的吸引力.
- 商业化受到聚硫化物穿效应的限制,导致骑自行车性能差.
- 现有的解决方案往往涉及不活性添加剂,从而降低了整体能量密度.
研究的目的:
- 提出一种基本的策略,以抑制Li-S电池中的聚硫化物穿效应.
- 设计一种基于辅溶剂的电解质,避免使用无活性添加剂.
- 调查溶剂混合性对多硫化物运输和电化学性能的影响.
主要方法:
- 作为基础电解质,使用了高供体数溶剂.
- 系统地引入了四种具有不同物理化学性质的辅溶剂.
- 通过调整辅溶剂成分来调整多硫化物的溶解度.
- 通过结合低可溶性溶剂来诱导局部相位分离.
主要成果:
- 调整辅助溶剂成分允许系统控制多硫化物溶解度和电化学动力学.
- 在低可溶性溶剂混合物中的局部相分离有效地阻碍了聚硫化物扩散.
- 基于辅助溶剂的电解质显著减轻了穿效应.
- 在Li-S电池中实现了大幅改善的循环稳定性.
结论:
- 基于溶剂的电解质设计是一种可行的基本策略,可以提高Li-S电池的性能.
- 避免不活性添加剂对于保持高能量密度至关重要.
- 溶剂混合性在控制聚硫化物运输和抑制穿效应方面发挥着至关重要的作用.
- 这种方法为开发先进的Li-S电池电解质提供了一个有希望的新方向.
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