在硫酸盐基离子电池电解质中,分子灵活性控制的离子溶解和电极反应动力学
Misa Yamashita1, Saki Sawayama1, Kenta Fujii1
1Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 2-16-1 Tokiwadai, Ube, Yamaguchi 755-8611, Japan.
The journal of physical chemistry. B
|February 19, 2026
概括
离子电池电解质中的溶剂分子灵活性显著影响离子溶解和电极动力学. 高度灵活的二甲基硫酸盐 (DMS) 电解质显示出独特的Li+协调和更快的动力学,但可以导致不稳定的接口,与稳定性提高的缩电解质不同.
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
- 物理化学 物理化学
背景情况:
- 了解离子溶解对于设计先进的离子电池 (LIB) 至关重要.
- 溶剂的分子灵活性是影响离子协调和电化学性能的关键因素.
- 与乙烯硫化 (ES) 等循环溶剂相比,二甲基硫化 (DMS) 提供了高分子灵活性.
研究的目的:
- 研究溶剂分子灵活性对LIB电解质中的Li+溶解结构的影响.
- 分析溶剂灵活性对石墨电极Li+插入动力学的影响.
- 阐明溶剂结构,溶解和电化学稳定性之间的关系.
主要方法:
- 拉曼光谱法用于研究在稀释和缩电解质中的Li+溶解复合物.
- 进行密度函数理论 (DFT) 计算,以确定溶解复合物的稳定性和结构.
- 在石墨电极上评估了电化学性能,包括激活能量和循环稳定性.
主要成果:
- 在稀释溶液中,Li+形成Li(DMS) 3+复合体,具有灵活的DMS,与ES中的Li(ES) 4+不同.
- 由Li+离子稳定的Li(DMS) 3+复合体,不如Li(ES) 4+稳定.
- 稀释的DMS电解质对Li+插入具有较低的激活能量,但形成不稳定的SEI层,导致容量降低.
- 缩的DMS电解质形成稳定的bis () 硫胺 (FSA) 衍生SEI膜,增强循环稳定性,尽管激活能量更高.
结论:
- 溶剂的分子灵活性极大地影响Li+协调,稳定不寻常的双形状.
- 电解质度和溶剂灵活性决定了电极动力学和界面稳定性之间的权衡.
- 这些发现为设计高性能和稳定的LIB电解质提供了分子层面的见解.
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