在现场电化学原子力显微镜研究在离子电池的石墨负电极上的界面反应
Sungjae Yoon1, Paul Maldonado Nogales1, Sangyup Lee1
1Department of Future Convergence Technology, Soonchunhyang University, Soonchunhyang-ro 22-gil, Sinchang-myeon, Asan-si 31538, Chungcheongnam-do, Republic of Korea.
International journal of molecular sciences
|July 29, 2025
概括
可以实现稳定的离子对石墨的共同插曲. 在离子电池中形成一个被动化表面膜,使离子运输成为可能,并减轻电解质分解的可逆容量.
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
- 表面科学是一门学科.
背景情况:
- 由于电解质的不稳定性和结构性降解,溶解的Mg2+离子与石墨的协同插入具有挑战性.
- 最近的电解质设计进步表明在特定条件下潜在的可逆性.
研究的目的:
- 在离子系统中研究石墨的界面行为.
- 确定可逆Mg2+离子对石墨的共同插曲的可行性和机制.
主要方法:
- 在现场电化学原子力显微镜 (电-AFM) 用于实时表面成像.
- 使用基于triglyme的电解质进行电化学试验.
- 循环电压测量来分析氧化还原行为.
主要成果:
- 实现了 158 mAh g-1 的可逆容量,这归因于三甲酸盐溶解的 Mg2+ 离子插入.
- 在初始周期中观察到被动化表面膜的形成,具有纳米级的山形状和泡状结构.
- 表面结构与氧化还原峰相关的部分可逆性,表明在Mg2+运输和电解质稳定性中的功能作用.
结论:
- 在早期的循环中,可以将化Mg2+离子稳定地与石墨相干.
- 接口工程和了解溶解结构对于开发有效的离子电池至关重要.
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