一个新的基于Mn的分层阴极,用于离子电池的扩大间层间距
Zhongjun Zhao1, Yiran Sun1, Yihao Pan1
1School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 0255000, PR China.
Journal of colloid and interface science
|August 18, 2023
概括
将和水引入层叠的氧化阴极,通过稳定结构和改善容量保留,提高离子电池的性能. 这项研究为高性能阴极材料提供了新的途径.
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:
- 层状氧化物 (KxMnO2) 由于其高能量密度,对离子电池 (PIB) 是有前途的阴极.
- 由Jahn-Teller效应和K+离子大小造成的结构性降解限制了KxMnO2的性能.
- 开发稳定和高性能阴极对于推进GDP至关重要.
研究的目的:
- 为了提高PIBs层叠的氧化阴极的结构稳定性和电化学性能.
- 为了抑制Mn3+离子中的Jahn-Teller效应,并减轻循环过程中的结构降解.
- 为了研究兴奋剂和介层水插入对阴极性质的协同效应.
主要方法:
- 新型K0.4Mn1-xLixO2·0.33H2O阴极材料的合成.
- 使用X射线光电子谱学 (XPS) 分析Mn氧化状态的表征.
- 在现场进行X射线衍射 (XRD) 来监测循环过程中的结构变化.
- 电化学测试用于评估容量保留和速率能力.
主要成果:
- 层间的水插入使层间的间距从6.34年扩大到6.93年.
- 兴奋剂有效控制了Mn3+/Mn4+的比率,抑制了Jahn-Teller效应.
- 最优的K0.4Mn0.9Li0.1O2·0.33H2O阴极显示显著改善容量保留 (84.04%) 与K0.4MnO2·0.33H2O (28.09%).
- 在修改后的阴极材料中观察到增强的速率能力和结构稳定性.
结论:
- 将离子和水分子共同插入层层的氧化结构是开发高性能PIB的有效策略.
- 经过修改的K0.4Mn1-xLixO2·0.33H2O阴极具有卓越的结构完整性和电化学稳定性.
- 这项工作为设计下一代离子电池的先进阴极材料提供了有前途的方法.
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