在分层氧化物中解锁可逆阴离子还氧化物,通过阴离子对介导稳定
Yizhou Fang1, Peng-Ji Wang1, Xiaohong Liu1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
ACS applied materials & interfaces
|February 9, 2026
概括
这项研究在P2型分层氧化物中使用阴离子对策略稳定了高能离子电池. 这种方法可以增强阳离子氧化还原活性,同时防止结构降解,从而提高电池性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- P2型层氧化物通过阳离子氧化还原为离子电池 (SIB) 提供高能量密度.
- 在SIB中,阳离子氧化还原因氧气损失和结构降解而受到影响,这限制了实际应用.
- 稳定氧氧还氧化活性对于开发高性能SIB至关重要.
研究的目的:
- 引入一个介于阴离子对的策略,以稳定P2型分层氧化物中的阳离子氧化还原.
- 研究和共同替代对P2-Na0.78Ni0.11Li0.12Zn0.1Mn0.67O2 (NNLZMO) 的结构和电化学性能的协同效应.
- 展示一种在高能分层阴极中同时解锁和稳定阴离子氧化还原的方法.
主要方法:
- 在P2-Na0.78Ni0.11Mn0.67O2的过渡金属层中,和的共同替代形成NNLZMO.
- 电化学表征包括循环电量测量,静电循环和阻抗光谱学.
- 在现场/现场表征技术,以分析结构演变和相位过渡.
主要成果:
- Li-Zn 阴离子对通过稳定不结合的 O2p 状态来协同激活可逆阴离子氧化还原.
- 来自阴离子对的结构性限制抑制了Na+/空位排序,并防止了不可逆转的P2-O2相位过渡.
- NNLZMO表现出最小应变的P2-Z阶段过渡 (1.59%的体积变化),在100个循环后达到174.62mAhg-1容量和90.8%的保留率.
结论:
- 阴离子对设计是一种有效的策略,用于稳定P2型分层氧化物中的阳离子氧化还原.
- 对于SIBs来说,NNLZMO阴极表现出增强的电化学性能和结构稳定性.
- 这种方法为开发稳定,高能量的离子电池铺平了道路.
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