Supporting data for "Rapid determination of solid-state diffusion coefficients in Li-based batteries via intermittent current interruption method"

This is the dataset of electrochemical and operando X-ray diffraction experiments for our publication "Rapid determination of solid-state diffusion coefficients in Li-based batteries via intermittent current interruption method". This archive contains the raw data and scripts written in R used in the analysis and presentation of the results in this manuscript. <strong>Abstract of the manuscript:</strong> The galvanostatic intermittent titration technique (GITT) is considered the go-to method for determining the Li⁺diffusion coefficients in insertion electrode materials. However, GITT-based methods are either time-consuming, prone to analysis pitfalls or require sophisticated interpretation models. Here, we propose the intermittent current interruption (ICI) method as a reliable, accurate and faster alternative to GITT-based methods. Using Fick’s laws, we prove that the ICI method renders the same information as the GITT within a certain duration of time since the current interruption. Via experimental measurements, we also demonstrate that the results from ICI and GITT methods match where the assumption of semi-infinite diffusion applies. Moreover, the benefit of the non-disruptive ICI method to operando materials characterization is exhibited by correlating the continuously monitored diffusion coefficient of Li⁺ in a LiNi_0.8Mn_0.1Co_0.1O₂-based electrode to its structural changes captured by operando X-ray diffraction measurements.本数据集为我们发表于论文《通过间歇电流中断法快速测定锂离子电池固态扩散系数》的电化学与原位X射线衍射（operando X-ray diffraction）实验的配套数据。本归档文件包含本论文用于结果分析与展示的原始实验数据，以及采用R语言编写的分析脚本。**论文摘要：** 恒电流间歇滴定技术（galvanostatic intermittent titration technique, GITT）是测定插层电极材料中锂离子扩散系数的主流方法。然而，基于GITT的各类方法要么耗时冗长，易陷入分析陷阱，要么需要借助复杂的解读模型。本文提出间歇电流中断法（intermittent current interruption, ICI），作为一种可靠、精准且更为高效的GITT替代方案。借助菲克定律（Fick’s laws），我们证明在电流中断后的特定时长范围内，ICI方法可获取与GITT方法完全一致的信息。通过实验测量，我们还证实当满足半无限扩散假设时，ICI与GITT的实验结果高度匹配。此外，通过将LiNi₀.₈Mn₀.₁Co₀.₁O₂基电极中持续监测的锂离子扩散系数，与原位X射线衍射测量得到的电极结构变化进行关联，我们展示了非破坏性ICI方法在原位材料表征中的显著优势。