Cheng Eric Jianfeng, Shoji Mao, Abe Takeshi, Kanamura Kiyoshi
Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan.
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
iScience. 2022 Feb 11;25(3):103896. doi: 10.1016/j.isci.2022.103896. eCollection 2022 Mar 18.
Although ceramic solid electrolytes, such as LiLaZrO (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 LiCoO (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.
尽管诸如LiLaZrO（LLZO）之类的陶瓷固体电解质有望替代传统液体电解质，以开发安全且高能量密度的固态锂金属电池，但阴极与陶瓷固体电解质之间的大界面电阻严重限制了它们的实际应用。在此，我们开发了一种含离子液体（IL）的非流体准固态LiCoO（LCO）复合阴极，它可以与掺铝的LLZO（Al-LLZO）陶瓷电解质保持良好接触。因此，LCO与Al-LLZO之间的界面电阻显著降低。准固态LCO/Al-LLZO/Li电池在60°C下循环100次后表现出约80%的相对较高的容量保持率。容量衰减主要是由于离子液体的不稳定性。然而，含离子液体的LCO阴极使得以简单实用的方式使用Al-LLZO作为固体电解质成为可能。确定合适的离子液体对于开发具有陶瓷固体电解质的准固态锂金属电池至关重要。
