Abstract

Lithium-ion-conducting amorphous materials in the system Li2S-GeS2 were prepared by use of a high-energy ball-milling process. The amorphous materials were obtained over the wide composition range up to 66.7mol%Li2S content. The composition range in which the amorphous materials were obtained by the ball-milling process was much wider than the glass-forming region by conventional melt-quenching methods. The lithium-ion conductivities of the obtained amorphous materials increased with an increase in the Li2S content. The activation energies for conduction correspondingly decreased with increasing the Li2S content. The 66.7Li2S⋅33.3GeS2(mol%) sample showed the maximum conductivity 1.1×10-4Scm-1 at 298 K.DC polarization measurements suggested that a lithiumion transport number was almost unity for the obtained amorphous materials.

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