通过化学潜力控制的分子动力学循环下电解质接口的动态进化和降解
Sart Ratanaporn1, Kiettipong Banlusan1,2
1Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand.
ACS applied materials & interfaces
|February 25, 2026
概括
研究人员模拟了离子电池的阳极,揭示了快速充电如何导致降解. 这项研究揭示了在循环过程中溶解和固体电解质相间演变的原子细节.
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
- 计算化学计算化学
背景情况:
- 阳极为下一代离子电池提供高容量.
- 体积膨胀和不稳定的固体电解质间相 (SEI) 会导致阳极的容量迅速减弱.
研究的目的:
- 研究电化学循环过程中阳极降解的原子起源.
- 开发一个模拟框架,用于多循环的化-脱化过程.
主要方法:
- 开发了一种化学潜力控制的反应分子动力学框架.
- 通过调整的化学潜力来模拟阳极的显式多循环化-脱化.
- 分析了Li迁移,阳极体积变化和SEI演变.
主要成果:
- 快速充电加快了Li的插入,导致Si溶解,体积损失和减少的保留.
- 乙烯碳酸盐 (EC) 在Si表面分解,形成分离成电解质的Si-C-O物种.
- 确定了合电极-电解质降解机制,将界面分解与机械故障联系起来.
结论:
- 该研究提供了对阳极合降解的原子视图.
- 开发的模拟方法可用于研究各种电池材料中的充放电过程.
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