期刊
MATERIALS LETTERS
卷 312, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2021.131646
关键词
All-solid-state lithium batteries; NaI; Solid electrolytes
资金
- JSPS KAKENHI [JP20K15379, JP19K05139]
- Hibi Science Foundation
An all-solid-state Li battery with a NaI-based Li+ conductor as the solid electrolyte was successfully fabricated. The Li+ conductivity and activation energy for Li+ conduction of the solid solution were confirmed, showing good performance compared to conventional high Li+ conductors. Additionally, the Li/TiS2 cell using this solid electrolyte exhibited excellent charge-discharge performances.
An all-solid-state Li battery was fabricated using a NaI-based Li+ conductor as the solid electrolyte. The formation of the solid solutions was confirmed for 9(15NaI center dot NaBH4)center dot LiI with no significant inclusion of LiBH4. The Li+ conductivity of 9(15NaI center dot NaBH4)center dot LiI was 1.5 x 10(-5) S/cm at 30 degrees C. The activation energy for Li+ conduction was estimated as 0.28 eV for 9(15NaI center dot NaBH4)center dot LiI. This compares well to the activation energy of the conventional high Li+ conductors with a single alkali cation. Furthermore, the charge-discharge performances of the Li/TiS2 cell using 9(15NaI center dot NaBH4)center dot LiI were excellent. It was shown that the charge-discharge capacity of 175 mAh/g can be maintained for 60 cycles under 0.05C. The Coulombic efficiencies of each cycle were over 99%.
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