缓解压力度通过阳离子 - 阴离子对应对向高度稳定的富含的阴极
Yu Zhou1, Hanwei Zhang1, Yinglei Wang2,3
1School of Material science and Engineering, Jiangsu University, Zhenjiang 212013, China.
ACS nano
|October 4, 2023
概括
用和配合富含的离子电池阴极,提高了稳定性和性能. 这一策略减轻了结构压力,并改善了先进的储能应用的容量保留.
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:
- 富含的,,和氧化 (NCA) 是离子电池的一个有前途的阴极材料,由于其高能量密度.
- 结构不稳定性,包括-混合和氧空缺,导致NCA阴极的容量降低.
- 制定提高NCA结构完整性和电化学性能的策略对于下一代电池至关重要.
研究的目的:
- 为了解决富含的NCA阴极中的结构不稳定性和容量退化问题.
- 调查阴离子 (F-) 和阴离子 (Mg2+) 协同作用对NCA性能.
- 提高高工作电压下NCA的电化学性能和循环寿命.
主要方法:
- 易于将F-和Mg2+编码到LiNi0.8Co0.15Al0.015O2 (NCA) 结构中.
- 电化学性能测试,包括循环稳定性和高压 (≥4.5V) 的速率能力.
- 实验和理论研究以阐明提高性能的机制,重点关注Li+扩散和结构稳定性.
主要成果:
- 与原始和单独合的NCA相比,合的Li0.99Mg0.01Ni0.8Co0.15Al0.05O0.98F0.02 (Mg1+F2) 材料表现出明显改善的电化学性能.
- 2+和F-codoping有效地减轻了Li+/Ni2+的混合,并抑制了氧气的泄漏,增强了结构完整性.
- 在200个循环 (1C,2.8-4.5V) 后,Mg1+F2阴极表现出82.65%的容量保留,超过原始NCA (55.69%).
- 使用Mg1+F2阴极的囊细胞在500个循环后显示出89.6%的容量保留,而NCA则为79.4%.
结论:
- 用F-和Mg2+进行阴离子共是一种有效的策略,可以提高富含的NCA阴极的结构稳定性和电化学性能.
- F-和Mg2+的协同作用改善了Li+扩散动力学,并抑制了有害的副作用,从而提高了循环寿命.
- 这种codoping方法为开发高级离子电池的高性能,稳定的阴极提供了有希望的途径.
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