通过局部结构法规,增强丰富的多层氧化物阴极的离子运输和结构稳定性
Wei Liu1,2, Juping Xu1,2, Wang Hay Kan1,2
1Spallation Neutron Source Science Center, Dongguan, 523803, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|June 14, 2023
概括
在含丰富的基层氧化物 (LRM) 中使用Sb兴奋剂增强了结构稳定性和离子传输. 这通过抑制容量和电压衰减来提高电池性能,从而带来更好的循环稳定性.
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:
- 富含的基层氧化物 (LRM) 是电池的有前途的阴极材料.
- LRM材料遭受结构性降解和劣质离子传输,限制了它们的实际使用.
- 容量和电压衰减是LRM性能面临的重大挑战.
研究的目的:
- 为了提高LRM阴极材料的结构稳定性和电化学性能.
- 调查反 (Sb) 兴奋剂和LRM中局部旋转相形成的影响.
- 为了改善+离子运输,并抑制电池循环期间的材料降解.
主要方法:
- 用局部旋转相合成Sb合的LRM材料.
- 电化学表征包括循环稳定性测试.
- 微分电化学质谱 (DEMS) 用于分析材料降解和氧气释放.
主要成果:
- Sb注会产生局部旋转相,改善Li+扩散通道和结构完整性.
- Sb-O 键增强了多层结构的稳定性.
- Sb兴奋剂有效地抑制氧气释放和电解质分解,减少结构降解.
- 在300个循环后,Sb-doped LRM保留了81.7%的容量,显著超过了无兴奋剂LRM (28.8%的保留率).
结论:
- Sb兴奋剂和局部旋转相的调节是改善LRM阴极性能的有效策略.
- 这种双重功能设计增强了离子运输,并减轻了结构退化.
- 开发的材料显示出卓越的循环稳定性,并抑制了先进电池的容量/电压色.
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