Abstract
The main concerns of the electric vehicle (EV) industry are the relatively low driving range and safety issues. The safety issues become more problematic with increasing battery size because conventional liquid electrolytes, e.g., ethylene carbonate (EC), are highly flammable. Although ceramic solid electrolytes, e.g., Li7La3Zr2O12 (LLZO), are promising candidates to replace the conventional liquid electrolytes for developing high-performance solid-state Li metal batteries, the large interfacial resistance between solid electrolytes and electrodes, particularity at the cathode-side, severely limits the practical application of those ceramic electrolytes. Here we developed an ionic liquid (IL)-containing while non-fluidic quasi-solid-state composite cathode, which can maintain a good contact with ceramic electrolytes. For example, the interfacial resistance between LiCoO2 (LCO) and Al-doped LLZO (Al-LLZO) decreased significantly with introduction of an IL. Quasi-solid-state LCO/Al-LLZO/Li cells demonstrated a relatively high capacity retention about 80% after 100 cycles at 60 °C. The IL therapy offers a simple and practical approach to addressing the interfacial resistance issue between cathodes and solid electrolytes. Nevertheless, the performance of the quasi-solid-state composite cathode is dependent on the type as well as the content of the IL. Thus, identifying a suitable IL as well as its optimal content is critical for the development of quasi-solid-state Li-metal batteries.
Published Version
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