期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 18, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202010620
关键词
composite cathodes; electrolyte degradation; ion transport; Li‐ S batteries; solid‐ state batteries; transmission line models
类别
资金
- Federal Ministry of Education and Research (BMBF) within the project LISZUBA [03XP0115A]
- Alexander von Humboldt Foundation
This study investigates the enhancement of solid-state lithium-sulfur batteries, demonstrating improved capacity retention with high areal capacity after 100 cycles at room temperature. The research findings are applicable to any solid-state composite with electrically insulating active materials.
Solid-state lithium-sulfur batteries (SSLSBs) have the potential to cause a paradigm shift in energy storage. The use of emerging highly-conductive solid electrolytes enables high energy and power densities. However, the need for an intimate mixture of electrolyte and conductive additives to compensate for the insulating nature of cathode active materials S-8 and Li2S induces intense electrolyte degradation. Thus, it is paramount to understand better the electrochemical and transport properties of the cathode composite with extremely high interface density among cathode components. Here, by utilizing a ball-milled composite of the lithium argyrodite Li6PS5Cl and carbon as a model electrode, the stability, reversibility, and transport in the composite as functions of cathode loading, the volume fraction of conducting phase, temperature, and applied potentials are comprehensively investigated. Comparing the onset potentials of electrolyte degradation and the sharp drop in the effective ionic conductivity of the composite determined through transmission-line model analysis, successful enhancement of the capacity retention of SSLSBs is demonstrated by balancing between the attainable capacity and effective carrier transport, achieving a high areal capacity of 3.68 mAh cm(-2) after 100 cycles at room temperature. The here-observed analysis is applicable to any solid-state composite with electrically insulating active materials.
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