稳定和高速率离子电池的Co/Al共同替代分层基氧化物阴极
Junxian Li1,2, Wenli Shu1,2, Guangwan Zhang1,2
1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel, Switzerland)
|March 28, 2024
概括
在基于的分层氧化物中,和的共同替代提高了离子电池阴极性能. 这种策略可以抑制有害影响,改善结构稳定性和电化学性能,用于实际应用.
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:
- 基于的分层氧化物是离子电池 (PIB) 的成本效益高的阴极材料.
- 这些材料中的Jahn-Teller效应和缓慢的动力学限制了它们的实际应用,原因是电极恶化和速度性能差.
- 开发稳定和高性能阴极材料对于推进GDP至关重要.
研究的目的:
- 调查Co/Al共同替代对P3型基层氧化物的结构和电化学性能的影响.
- 为了抑制Jahn-Teller扭曲,并改善K+扩散动力学.
- 为了提高PIBs的阴极材料的整体稳定性和性能.
主要方法:
- 通过共同替代策略合成P3型K0.45Mn0.7Co0.2Al0.1O2阴极材料.
- 电化学表征包括静电循环和速率能力测试.
- 在现场进行X射线衍射 (XRD) 来研究循环过程中的结构演变.
主要成果:
- 在K0.45Mn0.7Co0.2Al0.1O2正极表现出高容量 (111mAhg-1在0.05Ag-1和81mAhg-1在1Ag-1).
- 在500个循环后,在1Ag-1下实现了71.6%的优异容量保留.
- Co/Al 共同替代有效地抑制了 Jahn-Teller 扭曲和相位过渡,增强了 K+ 运输路径.
结论:
- Co/Al共同替代是一种可行的策略,可以提高PIBs的基层氧化物阴极的性能.
- 增强的结构稳定性和电化学特性有助于开发用于离子储能的先进阴极材料.
- 这项工作为下一代电池设计稳定高效的电极材料提供了洞察力.
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