在离子电池中,用于提高丰富阴极材料的循环和速率性能的双重修改策略
Xin Zhang1, Tao Wu2, Jiyuan Jian1
1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|July 29, 2024
概括
富含的正极材料 (NCM) 的表面修改,涂上硫酸涂层和硫,提高了离子电池的性能. 这种方法稳定了阴极表面,减少了副作用,并改善了容量保留.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 多层丰富的正极材料 (NCM,x ≥ 80%) 面临由于表面不稳定的商业化挑战.
- 含量增加加剧了表面性和阴极/电解质副作用反应,降低了NCM容量.
研究的目的:
- 为了提高丰富的NCM材料的电化学性能.
- 为了解决高NCM阴极的表面不稳定性和容量退化问题.
主要方法:
- 在现场在NCM二次粒子上构建稳定的硫酸涂层.
- 在NCM的近地表面区域实现格子硫注射.
主要成果:
- 协同修改显著减少了有害的残留化合物 (RLCs).
- 抑制了阴极表面和电解质之间的副作用反应.
- 提高了NCM材料的速度能力和循环稳定性.
结论:
- 硫酸涂层和硫剂有效地稳定了NCM阴极表面.
- 协同修改提高了离子电池的整体电化学性能.
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