Lithium ion conducting amorphous solid electrolytes were prepared from SiS2 and various kinds of lithium compounds by mechanical milling. Electrolytes using Li2S, Li3N, and Li2O as a lithium source exhibited high conductivities of 10(-5)-10(-4) S cm(-1) at room temperature, while those using Li3PO4, LiOH, and LiCl showed conductivities lower than 10(-6) S cm(-1). The conductivity of the 50Li(2)O . 50SiS(2) (mol%) solid electrolyte drastically increased with the milling period from 0 to 5 It. The enhancement of conductivity during milling is due to the formation of the corner-shared and isolated SiS4 and SiOS3 tetrahedral units in the solid electrolyte. (C) 2004 Elsevier B.V. All rights reserved.