Mechanochemical synthesis of high lithium ion conducting materials in the system Li3N-SiS2

High lithium ion conducting materials were mechanochemically synthesized using Li3N and SiS2 as starting materials. The obtained Li3N-SiS2 materials were almost amorphous; the amorphous phases consisted Of SiS4 tetrahedral units with no edge sharing and the local structure was very similar to that of mechanically milled Li2S-SiS2 amorphous materials. High lithium ion conducting Li3N-SiS2 materials could be synthesized in very short milling periods, around 20 min, since explosive reactions occurred in this system. The mechanically milled 40Li(3)N.60SiS(2) (mol %) material exhibited excellent properties as solid electrolytes such as high conductivity around 10(-4) S cm(-1) at room temperature, unity of lithium ion transport number, and a wide electrochemical window of about 10 V vs Li+/Li.