从表面到批量化稳定高阴极材料,具有出色的电化学性能
Jieyu Yang1, Guihong Mao1, Tengyu Yao1
1Jiangsu Key Laboratory of Materials and Technologies for Energy Storage, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China.
Angewandte Chemie (International ed. in English)
|December 20, 2024
概括
高层氧化物阴极的化通过稳定结构和接口来提高电池性能. 这一战略改善了下一代电池的容量保留和电压稳定性.
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:
- 高层氧化物对高能量密度电池来说是有希望的.
- 由于表面反应性和相位转换,产能衰减和电压衰减阻碍了商业化.
研究的目的:
- 开发一种化策略,以解决高层氧化物阴极的稳定性问题.
- 在高速率和高压条件下提高电化学性能.
主要方法:
- 将 (F) 原子引入多层氧化物的氧层.
- 创建一个聚合接口.
- 分析F替代对离子框架稳定性和Li+扩散的影响.
主要成果:
- 替代氧气通过TM-F结合稳定了分层结构,减少了网格应变.
- 形成一个稳定的阴极-电解质接口 (CEI),减轻氧空隙形成,高压攻击和金属溶解.
- 化阴极在10°C (2.7-4.5V) 达到192.9 mAh g-1的可逆容量.
结论:
- 化是稳定高层氧化物阴极的有效策略.
- 这种方法提高了Li+动态性和界面稳定性,用于高速率,高压电池应用.
- 该研究为先进的阴极材料提供了设计概念.
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