在高压运行过程中,动态休眠的富含的层状阴极在高压运行过程中
Jiyu Cai1, Xinwei Zhou2, Luxi Li3
1Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL, 60439, USA.
Advanced materials (Deerfield Beach, Fla.)
|March 3, 2025
概括
高压丰富的阴极显示出由于结构变化而造成的显著容量损失,而不仅仅是动力学. 了解这种降解机制是开发长周期快充电池的关键.
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
- 电池技术 电池技术
背景情况:
- 富含的阴极对于高能量密度电池至关重要,但在高压运行时会降解.
- 在这些阴极中量化容量损失贡献 (热力学与动力学) 是一个挑战.
研究的目的:
- 精确地解构LiNi0.83Mn0.1Co0.07O2阴极中的不可逆和可逆容量损失.
- 阐明长期循环期间高压阴极的降解机制.
主要方法:
- 多尺度同步子X射线探测器
- 电子显微镜的电子显微镜
- 后静电间歇定位技术 (GIT) 的使用.
- 完整的细胞配置分析.
主要成果:
- 层层的结构在4.6V的1000个循环后仍然完好无损,尽管质量转移动力学下降了三级.
- 在无动力条件下,容量损失在很大程度上是可以恢复的,这表明动力休眠状态.
- 降解与格子菌株的演变和结构异质性 (分层相比岩盐相) 有关.
结论:
- 富含Ni的正极的结构完整性在高电压下保持不变,但动力限制主导了容量衰减.
- 网格压力和相异质性是高压阴极降解的关键因素.
- 这些见解对于设计下一代电池具有增强的循环稳定性和充电速度至关重要.
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