通过对离子电池的共度调制,本地建造基于Mn的分层阴极
Haolv Hu1, Cheng-Wei Kao2, Chen Cheng1
1Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China.
ACS applied materials & interfaces
|June 16, 2023
概括
将 (Ru) 引入P2型 (Mn) 基层氧化物中,通过抑制有害的相位过渡和Jahn-Teller扭曲,提高离子电池 (SIB) 阴极稳定性,改善整体电化学性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于P2型Mn的分层氧化物由于成本和容量,是离子电池 (SIB) 的有希望的阴极.
- 然而,Jahn-Teller扭曲和不良的自行车稳定性限制了它们的实际应用.
研究的目的:
- 提高P2型Mn基层氧化物的稳定性和电化学性能.
- 研究高价值Ru替代对这些阴极的结构和电化学行为的影响.
主要方法:
- 合成一个Ru替代的P2型分层氧化物 (Na$_{0.6}$Mg_{0.3}$Mn$_{0.6}$Ru$_{0.1}$O$_{2}$,NMMRO).
- 结构性和电化学性质的表征.
- 分析局部原子配置和结合.
主要成果:
- 替代Ru有效抑制了P2-OP4阶段过渡.
- 通过抑制Mg/Mn秩序破坏和离子迁移,可以实现更好的结构稳定性.
- 削弱的Mn-O共价性和增强的电子外位化减少了Jahn-Teller扭曲和氧离子氧化.
- 与无Ru对应物相比,NMMRO表现出优越的结构完整性和电化学特性.
结论:
- 通过Ru替代进行局部调制是稳定P2型Mn基阴极的可行策略,用于高性能SIB.
- 这项研究提供了关于减轻分层氧化物阴极中的降解机制的见解.
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