在P2型氧化物阴极中的分层层次结构修改策略使离子电池具有高速率能力和长期稳定性
Chen Wu1,2,3, Yuxing Xu1,3, Jiechen Song1,2,3
1State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
ACS applied materials & interfaces
|October 8, 2025
概括
使用Li,F和Mg的P2-Na0.67Ni0.33Mn0.67O2阴极的层次修改可以提高离子电池的性能. 这一策略克服了相位过渡和氧化还原问题,使稳定,高容量的能量存储成为可能.
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-Na0.67Ni0.33Mn0.67O2是离子电池 (SIB) 的一个常见的阴极.
- 关键的挑战包括不可逆转的P2-O2相位过渡,Na+/空位排序和阳离子氧化还原反应.
- 这些问题限制了SIB的电化学性能和周期寿命.
研究的目的:
- 为P2-NaNM阴极开发一个分层层次的分层修改策略.
- 为了应对阻碍SIB性能的关键挑战:相位过渡,离子排序和离子还氧化.
- 提高离子电池阴极的结构稳定性和电化学性能.
主要方法:
- 在氧气位点加入 (F),以提高阳离子氧化还原可逆性.
- 在过渡金属部位的 (Li) 替代促进了阴离子乱,并抑制了Na+/空缺排序.
- 在部位的 (Mg) 替代减轻层排斥和增强结构凝聚力.
主要成果:
- 优化的P2-Na0.67Ni0.25Li0.08Mn0.57Mg0.10O1.93F0.07 (Mg-NaNLMF) 阴极显示出极好的稳定性.
- 在0.1C的60个循环中实现了98.07%的容量保留,在10C的1000个循环后达到81.72%.
- 证明了增强的结构完整性和抑制了不可逆转的相位过渡和氧化还原反应.
结论:
- 一个分层的等级修改策略有效地解决了P2-NaNM阴极中的关键问题.
- 开发的Mg-NaNLMF阴极为离子电池提供了卓越的电化学性能.
- 这种方法为设计高性能分层氧化物阴极提供了一个新的范式.
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