缓解Jahn-Teller效应:用于离子电池的胺基NASICON阴极的第一原则和实验研究
Yiran Zheng1, Jing Yang1, Hedong Chen2
1Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics, South China Normal University, Guangzhou 510006 China.
Journal of colloid and interface science
|February 5, 2025
概括
用添加离子电池阴极通过抑制Jahn-Teller效应来防止容量损失. 这种以为基础的NASICON型酸盐显示出出色的结构稳定性和循环性能.
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
- 固态化学 固态化学
背景情况:
- 基于的材料是离子电池 (SIB) 的成本效益高的阴极候选材料.
- 在Mn3+中的Jahn-Teller效应导致SIB的结构不稳定性和容量退化.
- 开发稳定的基阴极对于高性能SIB至关重要.
研究的目的:
- 为了减轻基于的SIB阴极中的Jahn-Teller效应.
- 为了合成和表征一种基基NASICON型酸盐,Na4MnAl(PO4) 3.
- 为了评估其电化学特性和SIB应用的结构稳定性.
主要方法:
- 在理论指导下合成配的Na4MnAl(PO4) 3.
- 密度功能理论 (DFT) 用于预测相位稳定性,电压和离子扩散.
- 电化学测试,包括循环稳定性和容量保留测量.
- 贝德尔电荷分析,以评估Jahn-Teller效应的抑制.
主要成果:
- DFT预测了Na4MnAl(PO4)3的有利的物理化学特性和快速动力学.
- 该材料在理论循环过程中表现出结构稳定性,体积变化最小 (6.2%).
- 有害的Jahn-Teller效应被有效地抑制了.
- 在5°C的500个循环后,Na4MnAl(PO4) 3实现了85.08%的容量保留,使用了Mn4+/Mn3+和Mn3+/Mn2+的氧化还原对.
- 当与硬碳配对时,在1C的200个循环后,它保持了81.8%的容量.
结论:
- 兴奋剂有效地抑制了基于的纳西康类型酸盐中的Jahn-Teller效应.
- Na4MnAl(PO4) 3具有高能量密度和出色的循环稳定性,使其成为高性能SIB的有希望的阴极材料.
- 这项研究为设计先进的基SIB阴极提供了有价值的理论和实验框架.
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