丰富的阴极电解质介面 同质化+ 流向稳定接口在丰富的基阴极中
Qinting Jiang1, Ming Li1, Jun Li1
1Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering, Xi'an University of Technology, Xi'an, Shaanxi, 710048, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|March 6, 2025
概括
一种新的气相化方法在丰富的基氧化物 (LMO) 阴极上产生稳定的LiF层. 这通过改善阴极-电解质间相 (CEI) 和电化学稳定性来提高电池性能.
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
- 表面化学 表面化学
背景情况:
- 稳定的阴极-电解质介面 (CEI) 结构对于高性能丰富的基氧化物 (LMO) 阴极至关重要.
- 不良的副作用和电解质分解限制了LMO阴极的稳定性.
- 实现均的离子流和抑制寄生反应是关键的挑战.
研究的目的:
- 开发一种气相化技术,在LMO表面上预先构建一个强大的LiF层.
- 研究LiF层对CEI形成和稳定性的影响.
- 提高LMO阴极的电化学性能和结构完整性.
主要方法:
- 气相化,在LMO上创建1nm LiF 层.
- 改造的LMO阴极的电化学表征 (循环,阻抗光谱).
- 分析CEI的组成和结构以及电极稳定性.
主要成果:
- 电层有效调节电场分布,并减轻了副作用.
- 形成了一个统一的富含LiF的CEI,促进了同质的Li+流和扩散.
- 经过修改的LMO阴极在100个循环后保持了95%的容量,显示出增强的稳定性.
- 观察到抑制盐分解和自身催化反应.
结论:
- 气相化是一种可行的策略,可以在LMO阴极上创建稳定的CEI层.
- 富含LiF的CEI显著提高了电化学稳定性和循环寿命.
- 这种方法为增强存储的高压阴极材料提供了一个有前途的途径.
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