Mechanochemical Synthesis of Fast Lithium Ion Conducting Solid Electrolytes in the Li2S-P2S5-SiS2-Al2S3 System
Yu. Shibutani, F. Mizuno, A. Hayashi and M. Tatsumisago
Department of Applied Chemistry, Graduate School of Engineering,
Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan)
E-mail:hayashi@chem.osakafu-u.ac.jp
Pages: 219-223
Abstract
Glassy solid electrolytes with higher Li2S content were mechanochemically prepared in the Li2S-P2S5 based multicomponent system, and showed high conductivity by the addition of glass formers SiS2 and Al2S3. The 78Li2S ×19.8P2S5×1.1SiS2×1.1Al2S3 (mol. %) glass exhibited the conductivity of 1.2×10-4 S/cm at room temperature, which was twice as high as the conductivity of the 78Li2S×19.8P2S5×2.2SiS2 glass without Al2S3. The glass ceramics obtained by crystallization of the glasses showed the same XRD patterns as superionic crystals called thio-LISICON II phase of Li4-xGe1-xPxS4, which is one of the best Li+ ion conducting crystals with very high conductivity over 10-3 S/cm at ambient temperature. The conductivity of the glass ceramic prepared by heating the glass at 230 oC was 1.2×10-3 S/cm, which was one order of magnitude higher than that of the corresponding glass. The precipitated thio-LISICON II analogs are responsible for the high conductivity of the glass ceramics.
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