通过定制的EMC-TMS溶剂混合物在离子电解质中增强离子溶解和导电性:分子动力学研究
Jitti Kasemchainan1, Siriporn Teeraburanapong1, Manaswee Suttipong1
1Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
ACS omega
|January 27, 2025
概括
研究人员探索了乙基甲基碳酸盐 (EMC) 和四甲基硫 (TMS) 混合物,以增强离子电池 (LIB) 电解质. 1:2的EMC/TMS比率显著提高了离子导电性和离子转移,改善了LIB的安全性和性能.
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
- 计算化学的计算化学
背景情况:
- 传统的离子电池 (LIB) 电解质由于有机碳酸盐的热和化学不稳定性而面临安全和寿命的限制.
- 开发稳定,高性能电解质对于推进LIB技术至关重要.
研究的目的:
- 调查混合溶剂系统的潜力,特别是乙基甲基碳酸盐 (EMC) 和四甲硫 (TMS),用于修改电解液中的离子溶解和增强电解液中的离子导电性.
- 通过分子动力学模拟,阐明这些混合电解质中的分子级相互作用.
主要方法:
- 利用分子动力学模拟来分析EMC/TMS溶剂混合物中的离子 (Li+) 的溶解结构和运输特性.
- 研究了TMS对Li+溶解和离子 (PF6-) 协调的影响.
主要成果:
- 纳入TMS改变了Li+溶解结构,TMS分子在Li+离子周围的优先协调.
- 添加TMS减少了PF6-离子的静电干扰.
- 在EMC和TMS之间观察到协同效应,EMC/TMS的最佳比率为1:2.
- 这种最佳比率使离子导电率 (0.91 mS/cm) 显著改善,Li+转移数为0.40.
结论:
- 该EMC/TMS混合溶剂系统显示了改善LIB电解质性能的巨大潜力.
- 了解分子层面的相互作用为设计更安全,更有效的LIB的先进电解质提供了基础.
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