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Preparation and characterization of hexagonal Li4GeO4-based glass-ceramic electrolytes
Solid State Ionics ( IF 3.2 ) Pub Date : 2021-03-21 , DOI: 10.1016/j.ssi.2021.115605
Yohei Yoneda , Manari Shigeno , Takuya Kimura , Kenji Nagao , Chie Hotehama , Atsushi Sakuda , Masahiro Tatsumisago , Akitoshi Hayashi

A new lithium-ion conducting oxide, hexagonal Li4GeO4, with a space group of P63/mmc, was prepared by mechanochemical treatment and subsequent heat treatment at 250 °C. The crystal structure was found in sulfide Li4SnS4, and this is the first study to report an oxide system. In addition, (100-x)Li4GeO4·xLi2MO4 (M = S or W; x = 10, 20, 30, and 40 mol%) glass-ceramic electrolytes with the hexagonal phase were prepared by crystallization of their mother glasses. The formability of the electrolytes improved as the quantity of Li2SO4 increased, and the 90Li4GeO4·10Li2SO4 glass-ceramic electrolyte showed the highest ionic conductivity of 2.9 × 10−6 S cm−1 at 25 °C. Compared with the experimental results, the bond valence sum (BVS) analysis results indicated that ionic conduction paths are easily connected along the c-axis in the hexagonal phase, suggesting that the relatively small lattices in the a- and b-axes are more advantageous for three-dimensional ionic conduction.



中文翻译:

六角形Li 4 GeO 4基玻璃陶瓷电解质的制备与表征

通过机械化学处理和随后在250°C的热处理,制备了一种新的锂离子导电氧化物,六角形Li 4 GeO 4,其空间群为P 6 3 / mmc。在硫化物Li 4 SnS 4中发现了晶体结构,这是首次报道氧化物体系的研究。此外,(100- x)Li 4 GeO 4 · x Li 2 MO 4(M = S或W; x 通过使它们的母玻璃结晶来制备具有10%,10、20、30和40mol%六方相的玻璃-陶瓷电解质。随着Li 2 SO 4含量的增加,电解质的可成型性提高,并且在25°C时90Li 4 GeO 4 ·10Li 2 SO 4玻璃陶瓷电解质显示出最高的离子电导率,为2.9×10 -6  S cm -1。与实验结果相比,键合价和(BVS)分析结果表明,离子传导路径在六方相中很容易沿c轴连接,这表明a和b中的晶格相对较小。b轴对于三维离子传导是更有利的。

更新日期:2021-03-22
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