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arXiv 2104.06113cond-mat.mtrl-sci
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使用几何描述符的多价电池阴极的自动扩散路径探索

Automatic diffusion path exploration for multivalent battery cathodes using geometrical descriptors

Felix T. Bölle, Arghya Bhowmik, Tejs Vegge, Juan Maria García Lastra, Ivano E. Castelli

摘要:

用于镁阴极材料的稳定且快速的离子导体具有实现超越当前锂离子技术的高能量密度电池的前景。到目前为止,只有少数候选材料已被确定,导致数据只是很少提供给社区。在这里,我们提出了一个系统的研究,在密度泛函理论的框架内,包括估计的扩散势垒的16种材料,通过采用轻推弹性带(NEB)计算。通过引入一个基于Voronoi镶嵌的路径查找算法的思想,我们表明,过渡态配置的估计可以自动提取运行NEB计算之前。使用几何描述符结合主成分分析,可以进一步对扩散路径进行分组。这种方法还扩展到不属于研究范围的材料,使其成为更有效地探索具有可区分扩散特性的晶体结构的可行方法。

英文摘要:

Stable and fast ionic conductors for magnesium cathode materials have the prospect of enabling high energy density batteries beyond current Lithium-ion technologies. So far, only a few candidate materials have been identified leading to data only being scarcely available to the community. Here, we present a systematic study, in the framework of Density Functional Theory, including the estimation of the diffusion barrier for 16 materials through employing Nudged Elastic Band (NEB) calculations. By introducing a path finder algorithm based on the idea of Voronoi tessellations, we show that an estimate of the transition state configuration can be extracted automatically prior to running NEB-calculations. Using geometrical descriptors in combination with a principal component analysis it is possible to further sub-group the diffusion paths. This approach also extends to materials which are not part of the study, making it a viable approach to more efficiently explore crystal structures with distinguishable diffusion characteristics.

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