在现场形成Li3N介层,增强固态电池的界面稳定性
Yuezhen Mao1, Tianyuan Wang1, Fusheng Yin1
1School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, PR China.
Journal of colloid and interface science
|January 24, 2025
概括
一个in situ化 (Li3N) 的中间层有效地抑制了金属电池中的树的生长. 这种中间层增强了循环稳定性和接口完整性,以获得更安全,更持久的电池性能.
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:
- 由于离子沉积不均,金刚石的生长在金属电池中构成安全风险.
- 开发稳定的接口对于提高电池寿命和性能至关重要.
研究的目的:
- 引入一种在现场形成的化 (Li3N) 介层,以调节离子沉积.
- 调查Li3N中间层对涂/剥离和电池循环稳定性的影响.
主要方法:
- 在金属上通过气反应在现场形成Li3N中间层.
- 电化学测试Li的有机体Li对称细胞和Li的有机体LiFePO4和Li的有机体LiCoO2的完整细胞.
- 密度函数理论 (DFT) 计算以了解Li3N上的Li+吸附和扩散.
主要成果:
- 3N中间层在1200小时内显著提高了二氧化对称细胞的循环稳定性.
- DFT的计算显示,在Li3N (001) 平面上有偏好的Li+吸附和表面扩散.
- 在700多个循环中实现了Li气体LiFePO4细胞的稳定循环,并在500个循环后在Li气体LiCoO2细胞中保持了81.6%的容量.
结论:
- 在位Li3N中间层有效地抑制了树的生长和副作用.
- 这一策略增强了接口稳定性,从而提高了金属电池的性能和安全性.
- 3N中间层为开发下一代固态电池提供了一个有前途的方法.
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