Sheet-type all-solid-state batteries with sulfidic electrolytes: Analysis of kinetic limitations based on a cathode morphology study

被引:21
作者
Kroll, Moritz [1 ]
Duchardt, Marc [1 ]
Karstens, Sarah L. [1 ]
Schlabach, Sabine [2 ,3 ]
Lange, Fabio [1 ]
Hochstrasser, Janika [1 ]
Roling, Bernhard [1 ]
Tallarek, Ulrich [1 ]
机构
[1] Philipps Univ Marburg, Dept Chem, Hans Meerwein Str 4, D-35032 Marburg, Germany
[2] Karlsruhe Inst Technol, Inst Appl Mat IAM, D-76344 Eggenstein Leopoldshafen, Germany
[3] Karlsruhe Inst Technol, Karlsruhe Nano Micro Facil KNMF, D-76344 Eggenstein Leopoldshafen, Germany
关键词
All-solid-state batteries; Slurry-casting; Morphological analysis; FIB-SEM tomography; NMC-85; 05; 10; DIFFUSION-COEFFICIENT; COMPOSITE CATHODE; ION-TRANSPORT; LITHIUM-ION; ELECTRODES; TORTUOSITY; CONDUCTION; RECONSTRUCTION; LI6PS5X; SPACE;
D O I
10.1016/j.jpowsour.2021.230064
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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., beta-Li3PS4 (small mesoporous particles, conductivity: 0.2 mS cm- 1) and 2 Li3PS4 center dot 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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页数:12
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