在P2型层氧化物中的协同电荷补偿过程使高可逆性离子电池成为可能
Chundi Wei1, Weiyang Yang1, Lei Wang1
1School of Materials Science and Engineering, Beihang University, Beijing, 100191, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 26, 2025
概括
在P2型层氧化物中,双离子替代增强了离子电池阴极,通过稳定结构和抑制有害影响,改善循环和性能.
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:
- 由于其高容量和电压,P2型层氧化物是离子电池 (SIB) 的有希望的阴极材料.
- 挑战包括来自Mn3+的Jahn-Teller效应和氧气演变和高电压下的离子位移造成的结构降解.
研究的目的:
- 研究P2型阴极中Cu/Ti共同替代的协同效应,以提高SIB中的结构可逆性和电化学性能.
- 阐明双离子替代所提供的电荷补偿机制和稳定策略.
主要方法:
- 在P2型的层状氧化物结构中,Cu和Ti的共同替代.
- 电化学测试,包括循环性能和容量保留.
- 在不同电位下分析结构稳定性和氧化还原机制.
主要成果:
- /联合替换建立了协同作用的电荷补偿,改善了整个电压范围内的结构可逆性.
- Ti-O 键在高电压下抑制氧气演变;Cu 氧化还原会提高电压并稳定 Ni 价值.
- 优化Na0.7Ni0.2Mn0.6Cu0.15Ti0.05O2 (TC-NNMO) 阴极显示151.88 mAh g-1容量,在200个循环后保持80.29%.
结论:
- 双电离子替代有效调节电荷补偿,增强P2型阴极的稳定性和循环性.
- 这种多离子合作战略为设计用于离子电池的高性能分层氧化物阴极提供了新的范式.
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