This study aimed to reveal the electrical characteristics of the composite electrodes of Li-ion batteries. LiCoO₂ electrodes were analyzed using atomic force microscopy, and three-dimensional datasets of current–voltage (I–V) curves (IV-datacubes) were obtained. The IV-datacubes were then analyzed using principal component analysis to determine the typical I–V curve corresponding to each LiCoO₂ particle on a statistical basis. Detailed analysis based on the thermionic emission model with series resistance showed that some of the particles exhibited poor electrical contact in the electrode. Overall, the obtained results suggested that our IV-datacube analysis can reveal the characteristics of buried electrical contacts within electrodes, which is otherwise difficult to accomplish using alternative methods. We, therefore, believe that the method presented herein is a promising analytical method for composite electrodes.

中文翻译：

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通过使用原子力显微镜测量的电流-电压数据立方体的主成分分析来分析LiCoO2电极

这项研究旨在揭示锂离子电池复合电极的电学特性。使用原子力显微镜分析了LiCoO ₂电极，并获得了电流-电压（IV）曲线的三维数据集（IV-数据立方体）。然后使用主成分分析法分析IV数据立方体，以确定对应于每个LiCoO ₂的典型I–V曲线统计上的粒子。基于具有串联电阻的热电子发射模型的详细分析表明，某些颗粒在电极中显示出不良的电接触。总的来说，获得的结果表明我们的IV-数据立方体分析可以揭示电极内埋入式电触点的特性，否则很难使用其他方法来完成。因此，我们认为本文介绍的方法是一种有前途的复合电极分析方法。