在金属上的化/化以太基LHCE的原子化洞察:通过多尺度模拟的分解机制
Fuming Du1, Haibin Wang1, Jiwei Chen1
1School of Materials Science and Engineering, Hunan Institute of Technology, Hengyang 421002, China.
The journal of physical chemistry. B
|August 22, 2025
概括
局部高度电解质 (LHCE) 在金属电池中表现出稳定的界面行为. 多尺度模拟显示FSI离子还原驱动固体电解质间相 (SEI) 形成,具有化和化溶剂独特的脱机制.
科学领域:
- 电化学
- 材料科学
- 计算化学
背景情况:
- 局部高度电解质 (LHCE) 的界面稳定性对于金属电池的性能至关重要.
- 在LHCE中形成固体电解质间相 (SEI) 的原子化机制尚不清楚.
研究的目的:
- 用化 (F2DEE) 和化 (Cl2DEE) 以太溶剂在LHCE中形成SEI的原子化机制.
- 在金属上比较F2DEE和Cl2DEE基电解质的分解途径.
主要方法:
- 多尺度模拟包括经典分子动力学 (CMD),初始分子动力学 (AIMD) 和密度函数理论 (DFT).
- 对电双层 (EDL) 重组,离子空间选择性和分解路径的分析.
- 电子结构分析 (预计状态密度,键演变,贝德电荷转移) 和能源障碍的DFT计算.
主要成果:
- 在LHCE中,CMD发现了独特的EDL重组和FSI离子保留在阳极附近.
- 在AIMD模拟中,FSI降解与溶剂参与是主要的分解途径.
- DFT确定了Cl2DEE的自发,无障碍脱与F2DEE的0.11 eV阻碍脱,解释了实验中的SEI组成差异.
结论:
- 建立了一个多尺度的模拟框架,以链接解决,EDL动态和SEI形成机制.
- 这项研究为电解质分解和SEI特性提供了原子学的洞察力.
- 这些发现为开发高压电池的稳定电解质提供了设计指南.
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