NASICON-type Li1.5Al0.5Ge1.5(PO4)3 Containing Amorphous Phase for Solid Li-Ion Conductor

Amorphous Li1.5Al0.5Ge1.5(PO4)3 (LAGP), which is an oxide-based solid electrolyte with a NASICON-type structure, was sintered at various temperatures to investigate its ionic conductivity and potential windows. The LAGP sheet sintered at 600 °C exhibited a slightly diminished ionic conductivity in c...

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Bibliographic Details
Published in:Denki kagaku oyobi kōgyō butsuri kagaku 2023/09/29, Vol.91(9), pp.097004-097004
Main Authors: KAWANO, Yoichiro, KATO, Akihiko, USUI, Hiroyuki, DOMI, Yasuhiro, SAKAGUCHI, Hiroki
Format: Article
Language:English
Subjects:
Conductivity
Crystal structure
Cyclic Voltammogram
Electrochemical Stability
Ion currents
NASICON
Oxidation
Oxidation resistance
Raman Spectroscopy
Sintering
Solid electrolytes
X-ray diffraction
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Summary:Amorphous Li1.5Al0.5Ge1.5(PO4)3 (LAGP), which is an oxide-based solid electrolyte with a NASICON-type structure, was sintered at various temperatures to investigate its ionic conductivity and potential windows. The LAGP sheet sintered at 600 °C exhibited a slightly diminished ionic conductivity in comparison to that sintered at 800 °C; however, it effectively suppressed the current density value for oxidative decomposition around 5 V vs. Li+/Li. The crystal structure of the sintered LAGP sheets was confirmed using X-ray diffraction (XRD) and Raman spectroscopy. The results showed that the LAGP sheet sintered at 600 °C contained both crystalline and amorphous phases of LAGP. It was considered that the oxidation resistance of the solid electrolyte was improved by sintering at 600 °C owing to the mixture of crystalline and amorphous phases of LAGP.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.23-00088