Amorphous TiS3 active materials were prepared using a high-energy ball mill and first applied to all-solid-state cells with Li2S-P2S5 solid electrolyte. The solid-state cell operated as a rechargeable lithium battery with a high capacity of 400 mA h g(-1) at room temperature. The cell exhibited a higher capacity than a solid-electrolyte cell with crystalline TiS2 and showed better cyclability than a liquid-electrolyte cell with crystalline TiS3.