Volume 135, Issue 13 e202217581
Zuschrift

New Oxyhalide Solid Electrolytes with High Lithium Ionic Conductivity >10 mS cm−1 for All-Solid-State Batteries

Yoshiaki Tanaka

Corresponding Author

Yoshiaki Tanaka

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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Koki Ueno

Koki Ueno

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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Keita Mizuno

Keita Mizuno

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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Kaori Takeuchi

Kaori Takeuchi

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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Tetsuya Asano

Tetsuya Asano

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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Akihiro Sakai

Akihiro Sakai

Technology Division, Applied Material Technology Center, Panasonic Holdings Corporation, 1006 Kadoma, Kadoma City, Osaka, 571-8501 Japan

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First published: 06 February 2023
Citations: 8

Abstract

All-solid-state batteries (ASSBs) with inorganic solid electrolytes (SEs) have attracted significant interest as next-generation energy storage. Halides such as Li3YCl6 are promising candidates for SE because they combine high oxidation stability and deformability. However, the ionic conductivities of halide SEs are not as high as those of other SEs, especially sulfides. Here, we discover new lithium-metal-oxy-halide materials, LiMOCl4 (M=Nb, Ta). They exhibit extremely high ionic conductivities of 10.4 mS cm−1 for M=Nb and 12.4 mS cm−1 for M=Ta, respectively, even in cold-pressed powder forms at room temperature, which are comparable to or surpass those of organic liquid electrolytes used in lithium-ion batteries. Bulk-type ASSB cells using the oxyhalides as the cathode SE demonstrate an outstanding rate capability with a capacity retention of 80 % at 5 C/0.1 C. We believe that the proposed oxyhalides are promising SE candidates for the practical applications of ASSBs.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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