阴极
快离子导体
电解质
材料科学
电导率
扫描电子显微镜
硫化物
电池(电)
化学工程
化学
纳米技术
分析化学(期刊)
电极
复合材料
物理化学
热力学
冶金
物理
工程类
色谱法
功率(物理)
作者
Moritz Kroll,Marc Duchardt,Sarah L. Karstens,Sabine Schlabach,Fabio Lange,Janika Hochstrasser,Bernhard Roling,Ulrich Tallarek
标识
DOI:10.1016/j.jpowsour.2021.230064
摘要
All-solid-state batteries (ASSBs) with sulfide-based solid electrolytes (SEs) promise to boost the energy density of future Li-ion batteries. Still little is known about the influence of cathode morphology and charge transport/transfer processes inside the cathode on battery performance. We report on a morphological investigation of two ASSB cathodes prepared by the industrially relevant sheet-type approach. Both employ state-of-the-art NMC 85|05|10 as cathode active material (CAM) and sulfide-based SEs differing in morphology and intrinsic ionic conductivity, i.e., β-Li3PS4 (small mesoporous particles, conductivity: 0.2 mS cm−1) and 2 Li3PS4∙LiI (large nonporous particles, conductivity: 0.8 mS cm−1). We apply focused ion-beam scanning electron microscopy to obtain high-resolution reconstructions, allowing to differentiate between CAM, SE, and voids and to conduct a morphological analysis of each phase as well as a simulation of ion transport in the SE phase. Based on morphological data, kinetic limitations in the cathodes are analyzed using a transmission-line model, indicating that charge transfer resistance at the CAM–SE interface is the dominating contribution, while resistances due to Li-ion migration in the SE and Li chemical diffusion in the CAM are considerably lower. Reducing charge transfer resistance at the CAM–SE interface is therefore a key to improving ASSB performance.
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