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通过Fe替代和增加Na含量来抑制P2型Li/Mn阴极中Jahn-Teller扭曲的协同作用

Jie Zeng¹, Cui Ma¹, Chong-Yu Du¹

¹College of Smart Materials and Future Energy, Fudan University, Shanghai, 200433, China.

Small (Weinheim an der Bergstrasse, Germany)

|October 24, 2025

概括

这项研究通过使用铁替代和增加含量来增强离子电池阴极,以提高初始库伦比效率并减少结构扭曲. 这导致层叠氧化物材料的容量和稳定性更好.

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:

层层的氧化物阴极对于离子电池至关重要,P型和基氧化物对氧氧还原有前景.
挑战包括初始库伦比克效率低 (Na 缺乏) 和由 Mn 减少产生的 Jahn-Teller 扭曲.
氧氧还氧化促进是提高正极容量的关键.

研究的目的:

为了减轻Jahn-Teller扭曲,并提高P2型分层氧化物阴极的初始coulombic效率.
研究Fe替代和增加Na含量的协同效应.
为了提高离子电池阴极的结构稳定性和电化学性能.

主要方法:

合成了一个P2类型的分层氧化物阴极:Na0.75Li0.2Mn0.7Fe0.1O2 (LMF-75).
使用的Fe替代和受控的Na含量.
评估结构稳定性和电化学性能,包括容量,库伦比效率和循环稳定性.

主要成果:

铁的替代抑制了MnO6八面体的扭曲,并改善了氧氧还氧可逆性.
增加的Na含量提高了初始库伦比效率,并调节了Mn氧化还原,减少了Jahn-Teller扭曲.
协同策略导致了高可逆容量 (196.7 mAh g-1),提高了初始库伦比效率 (92.6%) 和出色的循环稳定性 (100 个循环后96.2%的保留率).

结论:

替代Fe和增加Na含量的协同方法有效地提高了P2型分层氧化物阴极的结构稳定性和电化学性能.
这一战略为开发用于离子电池的高性能阴极材料提供了一个有希望的途径.
该研究展示了一种可行的方法,以克服基于和的分层氧化物阴极的关键挑战.

关键词:

铁替代法替代法替代法杰恩·泰勒效应是什么?有层次的阴极层.氧气氧化氧化还原反应离子电池是一种离子电池.

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