Ionic liquid-containing cathodes empowering ceramic solid electrolytes

iScience

卷:25

Takeshi Abe¹  Mao Shoji²  Eric Jianfeng Cheng³  Kiyoshi Kanamura⁴ 

[1] Corresponding author;

[2] Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan;

[3] Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan;

关键词: Energy storage;    Materials science;    Ceramics;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: Although ceramic solid electrolytes, such as Li7La3Zr2O12 (LLZO), are promising candidates to replace conventional liquid electrolytes for developing safe and high-energy-density solid-state Li-metal batteries, the large interfacial resistance between cathodes and ceramic solid electrolytes severely limits their practical application. Here we developed an ionic liquid (IL)-containing while nonfluidic quasi-solid-state LiCoO2 (LCO) composite cathode, which can maintain good contact with an Al-doped LLZO (Al-LLZO) ceramic electrolyte. Accordingly the interfacial resistance between LCO and Al-LLZO was significantly decreased. Quasi-solid-state LCO/Al-LLZO/Li cells demonstrated relatively high capacity retention of about 80% after 100 cycles at 60°C. The capacity decay was mainly because of the instability of the IL. Nevertheless, the IL-containing LCO cathode enabled the use of Al-LLZO as a solid electrolyte in a simple and practical way. Identifying a suitable IL is critical for the development of quasi-solid-state Li-metal batteries with a ceramic solid electrolyte.

【 授权许可】

Unknown