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arXiv 2302.06759cond-mat.mtrl-sci
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用逾渗理论模拟晶体电极中的离子输运和无序

Modeling ionic transport and disorder in crystalline electrodes using percolation theory

Alexander Urban

摘要:

固体离子导体是电池和燃料电池的重要组成部分。在许多情况下,通过具有取代无序的晶体材料的离子传导可以用原子尺度晶格模型逾渗模拟来建模。本章回顾的离子逾渗理论描述了扩散路径的逾渗行为,确定了有助于离子传导的晶格位点的分数,并量化了扩散网络的曲折度。这些量可以与嵌入电池电极的体扩散率和容量有关。我们讨论了锂离子电池阴极中的无序岩盐和相关的晶体结构的应用程序,显示如何扩散途径和它们的曲折度随锂含量的短程顺序。所有示例都基于免费和开源的Dribble仿真软件。

英文摘要:

Solid ionic conductors are essential components of batteries and fuel cells. In many cases, ionic conduction through crystalline materials with substitutional disorder can be modeled with atomic-scale lattice model percolation simulations. The ionic percolation theory reviewed in this chapter describes the percolation behavior of diffusion pathways, identifies the fraction of lattice sites that contributes to ionic conduction, and quantifies the tortuosity of diffusion networks. These quantities can be related to the bulk diffusivity and capacity of intercalation battery electrodes. We discuss applications to lithium-ion battery cathodes in the disordered rocksalt and related crystal structures, showing how the diffusion pathways and their tortuosity vary with the Li content short-range order. All examples are based on the free and open-source Dribble simulation software.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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