An approach to increase the autonomy of batteries developed for transportation applications, without changing currently-used positive and negative active materials, is to increase the battery energy density by increasing the active material loading (mg.cm⁻²) of the electrodes. A direct consequence of a higher loading is the increase of mass transport-related issues across the electrode porosity. Therefore, the optimization of the porous electrode structure is mandatory to facilitate the access of lithium ions to the whole electrode volume. In this regard, pore tortuosity is a key parameter whose determination is not so straightforward. Although tomography techniques and corresponding analyses are promising methods to acquire precise geometrical information about porous electrode, they hardly can be used as a routine technique. In this work, a transmission-line-model analysis of the electrochemical impedance diagram of symmetric cells containing porous electrodes in blocking condition, i.e. without any charge transfer reaction, is proposed in order to readily derive pore tortuosity. The method is applied to a set of graphite electrodes composed of anisotropic particles.

中文翻译：

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使用对称池阻抗谱分析确定曲折度

一种方法来增加的运输应用而开发的电池的自主性，不改变目前使用的正极和负极活性物质，是通过增加活性材料负载（mg.cm增加电池的能量密度^-²）的电极。较高负载的直接结果是整个电极孔隙率中与传质相关的问题增加。因此，必须对多孔电极结构进行优化以促进锂离子进入整个电极空间。在这方面，孔曲折度是一个关键参数，其确定并非如此简单。尽管层析成像技术和相应的分析是获得有关多孔电极的精确几何信息的有前途的方法，但它们几乎不能用作常规技术。在这项工作中，提出了在阻塞条件下，即没有任何电荷转移反应的情况下，包含多孔电极的对称电池的电化学阻抗图的传输线模型分析，以便于得出孔的曲折性。