使用Nb5+化高层三元阴极材料的设计及其结构稳定性
Tingting Zhao1,2, Pei Liu1, Fuli Tang2
1College of Chemistry and Chemical Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, People's Republic of China.
Nanotechnology
|September 4, 2023
概括
(Nb5+) 兴奋剂增强了离子电池阴极材料,如NCM811. 这一策略改善了结构稳定性和离子导电性,大大提高了电池的性能和周期寿命.
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
- 固态化学 固态化学
背景情况:
- ---氧化 (NCM811) 是高能离子电池的关键阴极材料.
- 由于结构不稳定,NCM811的容量衰减和循环性能差.
研究的目的:
- 调查 (Nb5+) 兴奋剂对NCM811阴极材料电化学性能的影响.
- 通过Nb5+兴奋剂来增强NCM811的结构稳定性和离子导电性.
主要方法:
- 合成Nb5+化NCM811阴极材料.
- 电化学测试,包括在各种速率和电压下进行充放电循环.
- 分析电子导电性和结构性质的第一原则计算.
主要成果:
- Nb5+ 兴奋剂增加了NCM811的间层间距和结构稳定性.
- 1%的Nb5+化NCM811的初始放电容量为222.3mAh·g-1在4.6V (0.1°C) 的情况下.
- 在1°C的100个循环后,容量保持率达到92.03%,明显超过未使用过的NCM811 (74.30%).
- 第一个原则计算证实了Nb5+兴奋剂增强的电子导电性和晶格稳定性.
结论:
- Nb5+兴奋剂是一种有效的策略,可以提高NCM811阴极材料的电化学性能.
- 增强的结构完整性和Li+导电性有助于保持卓越的容量和循环寿命.
- Nb5+兴奋剂为开发用于高能离子电池的先进阴极材料提供了一个有前途的途径.
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