硫电池中的离子液体和聚硫化物之间的相互作用:系统密度功能理论研究
Chengren Li1,2, Nan Zhou1,2, Rongde Sun1,2
1National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Materials (Basel, Switzerland)
|June 19, 2024
概括
混合离子离子液体显示了硫电池的增强稳定性. 它们与聚硫化物的独特相互作用提高了电解质性能,为先进的能量存储设备提供了有前途的途径.
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
- 计算化学的计算化学
背景情况:
- 离子液体 (ILs) 是能量储存的有希望的电解质.
- 在ILs中的混合离子可以降低点并防止结晶.
- 这些特性有利于开发先进的电池.
研究的目的:
- 研究ILs中混合离子 ([FTFSA]-,[MCTFSA]-) 和阴离子 ([C4mpyr]+) 之间的相互作用.
- 将这些相互作用与含有对称离子的ILs进行比较 ([TFSA]-,[FSA]-).
- 分析这些ILs与聚硫化在硫电池中的行为.
主要方法:
- 使用分散校正密度函数理论 (DFT-D) 的计算.
- 该研究的重点是特定的混合和对称离子与离子之间的相互作用.
- 研究了与多硫化物 (S8和Li2Sn) 的相互作用.
主要成果:
- 混合离子[MCTFSA]-及其对应的IL表现出卓越的稳定性和相互作用强度.
- 在相位过渡期间,IL离子和多硫化物之间观察到一致的相互作用.
- 杂交和对称离子ILs之间的阴离子-离子相互作用显著不同.
结论:
- 混合离子ILs,特别是[MCTFSA]-,为硫电池电解质提供了增强的稳定性.
- 聚硫化与IL离子和的独特相互作用机制对于电池性能至关重要.
- 这些发现凸显了量身定制的ILs在下一代能源存储方面的潜力.
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