A Figure of Merit for Fast-Charging Li-ion Battery Materials,ACS Nano

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A Figure of Merit for Fast-Charging Li-ion Battery Materials
ACS Nano ( IF 15.8 ) Pub Date : 2022-06-16 , DOI: 10.1021/acsnano.2c03922
Huarong Xia ₁ , Wei Zhang ₁ , Shengkai Cao ₂ , Xiaodong Chen _{1,

2}

Affiliation

Rate capability is characterized necessarily in almost all battery-related reports, while there is no universal metric for quantitative comparison. Here, we proposed the characteristic time of diffusion, which mainly combines the effects of diffusion coefficients and geometric sizes, as an easy-to-use figure of merit (FOM) to standardize the comparison of fast-charging battery materials. It offers an indicator to rank the rate capabilities of different battery materials and suggests two general methods to improve the rate capability: decreasing the geometric sizes or increasing the diffusion coefficients. Based on this FOM, more comprehensive FOMs for quantifying the rate capabilities of battery materials are expected by incorporating other processes (interfacial reaction, migration) into the current diffusion-dominated electrochemical model. Combined with Peukert’s empirical law, it may characterize rate capabilities of batteries in the future.

中文翻译：

快速充电锂离子电池材料的品质因数

几乎所有与电池相关的报告都必须对速率能力进行表征，而没有用于定量比较的通用指标。在这里，我们提出了扩散的特征时间，主要结合了扩散系数和几何尺寸的影响，作为一种易于使用的品质因数（FOM）来规范快速充电电池材料的比较。它提供了一个指标来对不同电池材料的倍率能力进行排名，并提出了两种提高倍率能力的通用方法：减小几何尺寸或增加扩散系数。基于此 FOM，通过将其他过程（界面反应、迁移）结合到当前以扩散为主的电化学模型中，有望获得更全面的 FOM 来量化电池材料的倍率能力。

更新日期：2022-06-16

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