基于Mn的P'2层氧化物,具有优越的稳定性和高容量,用于离子电池
Xiaoyu Gui1, Zhipeng Xiang1, Tianlu Ren1
1Guangdong Provincial Key Laboratory of Fuel Cell Technology, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510641, China.
Advanced materials (Deerfield Beach, Fla.)
|March 31, 2025
概括
高的兴奋剂稳定了P.
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:
- P'2-NaxMnO2 (NMO) 在离子电池中提供了高容量,但受到快速容量退化的影响.
- 在NMO中,Jahn-Teller扭曲和多相过渡有助于它的不稳定性.
- 开发稳定的阴极材料对于推进离子电池技术至关重要.
研究的目的:
- 为了提高P'2-NMO阴极材料的电化学稳定性和循环性.
- 调查高性兴奋剂和合物对NMO结构和性能的影响.
- 通过合理的材料设计,减轻离子电池的容量衰减.
主要方法:
- 合成高度化P'2-Na0.59Mn0.90Ti0.02Cu0.02Ni0.02Co0.02Fe0.02O1.95F0.05 (NMHE0.1subOF) 的方法.
- 物理化学特征 (例如,X射线衍射,扩展的X射线吸收细结构).
- 在现场和现场分析以研究阶段过渡和结构变化.
主要成果:
- 与NMO相比,NMHE0.1OF表现出降低的Mn─O键异质性和增强的氧气协调.
- NMHE0.1OF经历了可逆的两相过渡,与NMO.0.1中不可逆的三相过渡不同.
- 合材料在高电压下与以太基电解质的兼容性得到改善.
- NMHE0.1OF在100个循环后达到97.8%的容量保留,在10 mA g-1下具有224 mAh的特定容量.
结论:
- 高的兴奋剂和的结合有效地抑制了Jahn-Teller扭曲,并稳定了P'2-NMO结构.
- 在NMHE0.1OF中可逆的双相过渡是其卓越的可循环和稳定的关键.
- 这一战略为设计用于离子电池的高性能阴极材料提供了一个有前途的途径.
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