Amorphous solid electrolytes were prepared, from a mixture of the crystalline components, by using a mechanical milling technique at room temperature. In the case of (100-x)(0.6Li2S•0.4SiS2)-xLi4SiO4, where x ranged from 0 to 5, the conductivities of powders which had been mechanically milled for 20h could be as high as 10-4S/cm at room temperature. These values were comparable to those for the corresponding compositions of melt-quenched glasses. As the mechanical milling treatment-time was increased from 0 to 20h, the structure of the milled powders became similar to that of glasses prepared by melt-quenching. Such structural changes resulted in a large conductivity increase, in the resultant powders, from 10-9 to 10-4S/cm.

Preparation of Amorphous Solid Electrolytes in the System Li2S-SiS2-Li4SO4 by Mechanical Milling. M.Tatsumisago, H.Morimoto, H.Yamashita, T.Minami: Solid State Ionics, 2000, 136-137, 483-8