Analysis of Charge Carrier Transport Toward Optimized Cathode Composites for All‐Solid‐State Li−S Batteries,Batteries & Supercaps

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Analysis of Charge Carrier Transport Toward Optimized Cathode Composites for All‐Solid‐State Li−S Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-09-14 , DOI: 10.1002/batt.202000194
Georg F. Dewald ₁ , Saneyuki Ohno ₁ , Joachim G.C. Hering ₁ , Jürgen Janek ₂ , Wolfgang Zeier ₃

Affiliation

A high theoretical energy density makes lithium‐sulfur (Li−S) batteries promising candidates for energy storage systems of the post‐lithium‐ion generation. As the performance of Li−S cells with liquid electrolytes is impaired by the solubility of reaction intermediates, solid‐state cell concepts represent an auspicious approach for future electrochemical energy storage. However, the kinetics of Li−S solid‐state batteries and high charge/discharge rate still remain major challenges, and in‐depth knowledge of the charge carrier transport in solid‐state composite sulfur cathodes is still missing. In this work, the charge transport and cyclability of composite cathodes consisting of sulfur, Li₆PS₅Cl and carbon, with varying volume fractions of ion‐ and electron‐conducting phases is investigated. The limiting thresholds of charge transport are elucidated by comparing the battery performance with effective transport properties of the cathode composite. Although both the effective electronic and ionic conductivities indicate high tortuosity factors, ionic transport is identified as a critical bottleneck. This work underscores the importance of quantitative transport analysis as a tool for cathode optimization.

中文翻译：

全固态Li-S电池向优化阴极复合材料的载流子输运分析

较高的理论能量密度使锂硫（Li-S）电池成为后锂离子发电储能系统的有希望的候选者。由于反应中间体的溶解性会损害带有液体电解质的Li-S电池的性能，因此固态电池概念代表了未来电化学储能的一种吉利方法。但是，Li-S固态电池的动力学和高充电/放电率仍然是主要挑战，并且仍然缺少对固态复合硫阴极中载流子传输的深入了解。在这项工作中，由硫，Li ₆ PS ₅组成的复合阴极的电荷传输和可循环性研究了具有不同体积分数的离子和电子导电相的Cl和碳。通过将电池性能与阴极复合材料的有效传输性能进行比较，阐明了电荷传输的极限阈值。尽管有效的电子电导率和离子电导率均显示出较高的曲折系数，但离子迁移仍被认为是关键的瓶颈。这项工作强调了定量迁移分析作为阴极优化工具的重要性。

更新日期：2020-09-14

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