超快速敲除+的扩散和的微妙结构演变5V3O8离子电池中的阳极
Nan Wang1, Yinsheng Xu1, John R Horsley2
1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
ACS nano
|July 26, 2024
概括
氧化 (Li5V3O8) 显示出作为离子电池快充阳极材料的承诺. 它表现出优异的容量保留和超快离子扩散,这是由于独特的敲击机制.
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:
- 氧化 (Li5V3O8) 是LiV3O8的化产物.
- 它正在被探索为离子电池的潜在间接类型阳极材料.
研究的目的:
- 为了研究Li5V3O8作为阳极材料的高速间歇能力.
- 阐明在循环过程中离子扩散机制和结构稳定性.
- 评估其在快充离子电池应用中的潜力.
主要方法:
- 实验合成和电化学测试的Li5V3O8.
- 第一个原则计算模型Li+扩散通路和能量障碍.
- 在化/脱周期期间分析结构变化.
主要成果:
- Li5V3O8的理论容量为256 mA hg-1和出色的高速率性能 (152 mA hg-1在40 C).
- 观察到异常的循环性,在20°C的11000个循环后保持80%的容量.
- 第一个原则的计算揭示了Li+的低能敲除扩散机制 (0.160.38 eV),促进超快离子运输.
结论:
- 5V3O8是一种非常有前途的极材料,用于快速充电的离子电池.
- 独特的淘汰扩散机制使其具有卓越的离子动力学和长期稳定性.
- 这项研究为介质材料中的固态离子扩散提供了基本的见解.
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