Microstructural evolution of solution-processed Li–Ge–Ga–S chalcogenide powders for Li+ ion battery applications

Sulfur-based chalcogenide Li–Ge–Ga–S powders for use in solid electrolyte of Li+ ion batteries have been successfully synthesized via a low-temperature solution-based process. Their Li+ ion conductivity turns out to be ~7×10−4S/cm at room temperature which is quite comparable with that of melt-quenc...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2016-01, Vol.431, p.57-60
Main Authors: Cho, Yun Gu, Shin, Sang Yeol, Lee, Jun Ho, Kim, Junghoon, Chung, Woon Jin, Shin, Dong Wook, Choi, Yong Gyu
Format: Article
Language:English
Subjects:
Amorphous chalcogenide
Chalcogenides
Evolution
Germanium
Ionic conductivity
Li+ ion battery
Lithium
Lithium-ion batteries
Microstructure
Solid electrolyte
Solid electrolytes
Solution process
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Summary:Sulfur-based chalcogenide Li–Ge–Ga–S powders for use in solid electrolyte of Li+ ion batteries have been successfully synthesized via a low-temperature solution-based process. Their Li+ ion conductivity turns out to be ~7×10−4S/cm at room temperature which is quite comparable with that of melt-quenched or mechanically-alloyed analogues. It is revealed that their microstructure becomes amorphized appropriately at a specific Ga/Ge ratio where the ionic conductivity is maximized. A structural model is proposed, which emphasizes correlations between gallium and lithium inside the amorphous structures. •Chalcogenide electrolyte in the Li–Ge–Ga–S system is prepared via a solution-based process.•The conductivity is comparable with that of analogues prepared via MQ or MA technique.•The conductivity turns out to depend mainly on amorphization of the prepared powders.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2015.04.009