通过在富含的多层氧化物阴极中通过Mg替代来调节阳离子氧化,使离子电池具有高电化学稳定性
Panya Thanwisai1, Panawan Vanaphuti1,2, Zeyi Yao1
1Department of Mechanical and Materials Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA.
Small (Weinheim an der Bergstrasse, Germany)
|October 16, 2023
概括
替代稳定P2型基层氧化物阴极用于离子电池 (SIB),改善下一代储能电池的结构完整性和电化学性能.
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:
- 离子电池 (SIB) 是离子电池 (LIB) 的可持续替代品,原因在于成本和资源的可用性.
- 基于的分层氧化物是有希望的SIB阴极,但在高电压下结构稳定性差.
- 提高阴极稳定性对于提高SIB性能和周期寿命至关重要.
研究的目的:
- 通过引入 (Mg) 来提高P2型Na$_{0.62}$Ni$_{0.25}$Mn$_{0.75}$O$_{2}$阴极的电化学稳定性.
- 调查Mg替代对相位过渡,Jahn-Teller扭曲和氧氧还氧行为的影响.
- 评估Mg对正极材料结构完整性和电化学性能的影响.
主要方法:
- 合成替代的P2型Na$_{0.62}$Ni$_{0.25}$Mn$_{0.75}$O$_{2}$阴极材料.
- 电化学测试,包括半电池和全电池的循环性能和速率能力.
- 使用诸如X射线衍射 (XRD) 等技术和其他相关方法分析结构变化的材料表征.
主要成果:
- 10mol%的Mg替代有效地抑制了P2-O2相位过渡和Jahn-Teller扭曲.
- 的结合减轻了不可逆转的氧氧还原反应,增强了结构完整性.
- 优化的Mg替代阴极表现出极好的容量保留:在100个周期 (半细胞) 后92%和在170个周期 (全细胞) 后95%.
结论:
- 替代是一种可行的策略,可以稳定SIBs的P2型Mn基层氧化物阴极.
- 改进的结构稳定性导致显著提高电化学性能和循环寿命.
- 这项工作有助于开发用于下一代离子电池的先进阴极材料.
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