基于Mn的分层氧化物的晶体调节,以长期持久的离子还氧化与离子电池的快速动力学
Gaoyuan Zhang1, XingXing Yin2, De Ning3
1Institute for Clean Energy Technology, North China Electric Power University, 102206, Beijing, P. R. China.
Angewandte Chemie (International ed. in English)
|November 1, 2024
概括
基于Mn的阴极的晶体调制通过稳定阳离子氧化还原反应来提高离子电池的性能. 这一战略改善了先进的储能容量的容量保留和速率能力.
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:
- 离子电池 (SIB) 由于成本效益,对储能充满希望.
- 带有阴离子氧化还原的基于Mn的分层氧化物具有高容量,但面临氧化还原失败和结构降解等挑战.
- 开发稳定和高性能阴极对于SIB进步至关重要.
研究的目的:
- 为了研究晶体调制对SIBs基于Mn的分层氧化物阴极的影响.
- 通过解决氧氧减氧故障和结构退化,提高速度能力和长期稳定性.
- 展示开发先进SIB阴极的通用战略.
主要方法:
- 使用基于Mn的Na$_{0.72}$Li$_{0.24}$Mn$_{0.76}$O$_{2}$与暴露的{010}方面的晶体调制策略.
- 电化学性能测试,包括速度能力和循环稳定性.
- 时间解析操作二维X射线衍射用于结构分析.
- 用硬碳阳极制造和测试一个全细胞.
主要成果:
- 模块化的阴极表现出增强的速率能力 (119.6 mAh g$^{-1}$在10 C) 和快速的动力学.
- 增强的Mn-O键抑制了氧氧化和O-O凝聚力损失,导致稳定的阳离子氧化还原活性 (在0.5°C下100个循环后保持100%).
- 操作XRD证实了强大的结构稳定性,在循环过程中体积变化超低.
- 完整的电池实现了~211Wh kg$^{-1}$的高能量密度.
结论:
- 晶体调制是为SIBs开发高性能Mn基氧化物阴极的重要策略.
- 暴露的 {010} 面和加强的 Mn-O 键有效地稳定了阳离子氧化还原反应和结构完整性.
- 这种方法为下一代离子电池创建稳定,高容量的阴极提供了通用途径.
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