双空位驱动的"格子软化"NiFeAlxLDHs用于高速和持久的离子存储
Zheng Li1, Yanwei Sui1, Zhihao Song2
1Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, School of Materials and Physics, China University of Mining and Technology, Xuzhou, 221116, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|November 17, 2025
概括
层状双氧化物 (LDH) 的缺陷工程提高了离子电池 (CIB) 的性能. 双空位NiFeAl LDH表现出晶格软化和改善的离子传输,用于稳定,高容量的CIB电极.
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:
- 缺陷工程对于电化学性能至关重要,但在离子系统 (如离子电池 (CIB)) 中尚未得到充分探索.
- 层状双氧化物 (LDHs) 是有前途的电极材料,但在离子间隙/脱间隙过程中经常出现结构稳定性差.
研究的目的:
- 制定一个缺陷工程策略,以提高CIB中LDH的电化学性能.
- 研究和氧共存空缺在改善结构灵活性和离子传输中的作用.
主要方法:
- 使用室温性蚀刻工艺合成双空位NiFeAl LDHs.
- 描述了材料的结构,缺陷和电化学特性.
- 进行了多层次的机制分析,以了解空缺职位的作用.
主要成果:
- 优化的NiFeAl LDH (NiFeAl0.04-24h-Cl LDH) 证明了"晶格软化"用于弹性变形和结构重建.
- 实现了高可逆容量 (101.4 mAh g-1 在1000 mA g-1) 和出色的循环稳定性 (1000 个循环) 与99.91%的库伦比效率.
- 空位促进了离子适应的增强,加速了离子扩散,并改善了界面动力学.
结论:
- 在NiFeAl LDH中,双空位工程提供了格子适应性,解决了阴离子宿主电极中的容量稳定性权衡.
- 这一战略为设计用于先进离子电池系统的高效电极提供了有前途的途径.
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