arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.04922cond-mat.mtrl-sci
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基于机器学习的钠基和锂基超离子导体离子电导率跨域预测

Machine-learning assisted cross-domain prediction of ionic conductivity in sodium and lithium-based superionic conductors

Yijie Xu, Yun Zong, Kedar Hippalgaonkar

摘要:

固态锂离子和钠离子电池利用固体离子传导化合物作为电解质。然而,这种材料的离子电导率往往低于其液体对应物,需要研究努力寻找合适的替代品。电解质筛选过程通常基于领域专业知识和试错法的混合,这两者都是时间和资源密集型的。数据驱动和机器学习方法最近已经脱颖而出,以加速学习发现。在这项工作中,我们提出了一个基于简单机械学习的方法来预测钠和锂基SICON化合物的离子电导率。使用主要的理论元素的特征描述符可从列表中的信息的单位细胞和目标化合物的成分的原子性质上的70 NASICON例子的有限的数据集,我们设计了一个逻辑回归为基础的模型,能够区分穷人和良好的超离子导体的交叉验证精度超过82%。此外,我们还演示了这样的系统如何能够以相同的精度对基于锂的示例进行跨域分类,尽管在训练期间引入了零个基于锂的化合物。通过系统的基于置换的评估过程,我们将考虑的特征数量从47个减少到7个,减少了83%以上,同时提高了模型性能。不同的电子和结构特征的整体离子电导率的贡献进行了讨论,并与文献中公认的理论进行了对比。我们的研究结果表明,这样一个简单的实用程序,但可解释的工具提供了机会,通过使用现有的数据作为固态电解质的潜在候选人的初步筛选。

英文摘要:

Solid state lithium- and sodium-ion batteries utilize solid ionicly conducting compounds as electrolytes. However, the ionic conductivity of such materials tends to be lower than their liquid counterparts, necessitating research efforts into finding suitable alternatives. The process of electrolyte screening is often based on a mixture of domain expertise and trial-and-error, both of which are time and resource-intensive. Data-driven and machine learning approaches have recently come to the fore to accelerate learnings towards discovery. In this work, we present a simple machine-learning based approach to predict the ionic conductivity of sodium and lithium-based SICON compounds. Using primarily theoretical elemental feature descriptors derivable from tabulated information on the unit cell and the atomic properties of the components of a target compound on a limited dataset of 70 NASICON-examples, we have designed a logistic regression-based model capable of distinguishing between poor and good superionic conductors with a cross-validation accuracy of over 82%. Moreover, we demonstrate how such a system is capable of cross-domain classification on lithium-based examples at the same accuracy, despite being introduced to zero lithium-based compounds during training. Through a systematic permutation-based evaluation process, we reduced the number of considered features from 47 to 7, reduction of over 83%, while simultaneously improving model performance. The contributions of different electronic and structural features to overall ionic conductivity is also discussed, and contrasted with accepted theories in literature. Our results demonstrate the utility of such a simple, yet interpretable tool provides opportunities for initial screening of potential candidates as solid-state electrolytes through the use of existing data.

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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