KJ Ceramics 31

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Detailed Program

Paper Number : FU-I05

Time Frame : 15:25~15:50

Presentation Date : Friday, 28, November

Session Name : Fuel cells and batteries

Session Chair 1# : Jong-Jin Choi

Session Chair 2# : Nobuhito Imanaka

Preparation and Characterization of Fast Ion Conducting Solid State Electrolytes for the Solid State Li-ion Battery

Inseok Seo

POSCO Global R&D Center

In this study, I will describe my research on two types of solid state electrolytes; amorphous lithium thio-germanate thin-films and solid state bulk electrolytes. While the thin film electrolytes, Li2S + GeS2, were prepared by RF sputtering deposition, the solid state bulk electrolytes, Li2S + P2S5, were produced by mechanical milling. For the first time, new high quality lithium germanium sulfide thin-films have been successfully made by RF sputtering and synthesized as new solid state electrolytes. The maximum ionic conductivities of the two types solid state electrolytes are over ~10-3 (S/cm). The ionic conductivities of the thin-films and bulk electrolytes are ~three order of magnitudes higher than reported values for oxide electrolytes which have been used in commercial products. Although these materials are unstable in air the thin-films and bulk electroyltes were thoroughly characterized by XRD, Raman, SEM, XPS, and impedance spectroscopy using special setups to prevent contamination. In this way, this work may provide a new way for developing new thin-film electrolytes for solid state lithium ion batteries.

Acknowledgements :

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