可调节的离子扩散特性在MoSSe双层阳极中,通过应变梯度来调整
Li Zhong1, Xiaobao Li1, Yuxue Pu1
1School of Civil Engineering, Hefei University of Technology, Anhui 230009, China. xiaobaoli@hfut.edu.cn.
Physical chemistry chemical physics : PCCP
|December 14, 2023
概括
层层的MoSSe纳米结构中的应变梯度显著影响电池阳极中的离子 (Li-ion) 扩散. 应用正应变梯度可以将离子扩散系数提高多达100倍,从而提高电池性能.
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
- 计算物理 计算物理
背景情况:
- 层层的MoSSe纳米结构是离子 (Li-ion) 电池的有希望的阳极材料.
- 高效的离子扩散对于高性能离子电池至关重要.
研究的目的:
- 系统地探索MoSSe双层阳极中的离子迁移路径和能量障碍.
- 研究堆叠模式和应变梯度对离子扩散特性的影响.
主要方法:
- 使用第一原理模拟来建模MoSSe双层阳极中的离子扩散.
- 分析包括不同的堆叠模式和应用均和梯度应变.
主要成果:
- 扩散特性对接口和堆叠配置非常敏感.
- 积极的应变梯度显著降低了扩散能量障碍,增加了扩散系数.
- 与原始的MoSSe相比,0.02 Å-1的菌株梯度增加了大约100倍的扩散.
- 应变梯度在降低扩散障碍方面比均应变更有效.
结论:
- 弹性-扩散合是负责延展梯度效应的底层机制.
- 这项研究提供了通过应变工程优化基于MoSSe的电池阳极的见解.
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