在O3-NaLi1/3Mn2/3O2中增强阳离子氧的可逆性和动力学,通过受控的P2间生长
Yihang Yang1, Qing Wang2, Jingrong Hou1
1Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials, Institute of New Energy for Vehicles, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.
Angewandte Chemie (International ed. in English)
|July 16, 2024
概括
离子电池中的阳离子氧化还原体显示出对更高能量密度的承诺. 在O3-NaLi$_{1/3}$Mn$_{2/3}$O$_{2}$中引入P2结构性相互增长,提高了可逆性和动力学,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:
- 在分层氧化物中的阳离子氧化还原提供比传统阴极更高的能量密度.
- O3-NaLi$_{1/3}$Mn$_{2/3}$O$_{2}$表现出阳离子氧化还原作用,但具有较差的可逆性和动力学.
- 合成的挑战阻碍了对阳离子氧化还原限制的解决方案.
研究的目的:
- 为了提高离子电池阴极中的阳离子氧化还原的可逆性和动力学.
- 为了研究P2结构性相互增长在O3-NaLi$_{1/3}$Mn$_{2/3}$O$_{2}$中对提高性能的影响.
- 开发先进的层氧化物阴极的合成策略.
主要方法:
- 控制的合成O3-NaLi$_{1/3}$Mn$_{2/3}$O$_{2}$与P2杂交生长.
- 操作微分电化学质谱 (DEMS) 来监测气体演变.
- 运行X射线衍射 (XRD) 来追踪循环过程中的结构变化.
主要成果:
- 实现了O3结构,其中27%的P2相互生长,保持了整体成分.
- 证明初始库伦比克效率为87%,相当于丰富的NMCs.
- 在C/20时获得了226 mAh g$^{-1}$的可逆容量,具有出色的循环稳定性.
- 抑制不可逆转的氧气释放和结构降解.
结论:
- P2结构的相互增长有效地提高了阳离子氧化还原反应的可逆性和动力学.
- 该策略可以提高层阴极性能,而不会牺牲容量.
- 这项工作为设计用于离子电池的高性能离子氧化还原材料提供了一种新的方法.
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