Formation of superionic crystals from mechanically milled Li2S-P2S5 glasses

A superionic crystal analogous to highly conductive thio-LISICON, which is a series of sulfide crystalline solid electrolytes such as Li4GeS4-Li3PS4, was successfully formed by the crystallization of mechanically milled Li2S-P2S5 glasses. The thio-LISICON phases have not been obtained by solid-phase reaction in the Li2S-P2S5 binary system so far, and this report is the first case of obtaining the thio-LISICON analogue in the binary system. The formation of this superionic crystal enhanced the conductivities of the glass, and the high ambient temperature conductivity of 7.2 x 10(-4) S cm(-1) was achieved in the glass-ceramics derived from the Li-rich 80Li(2)S . 20P(2)S(5) (mol%) glass. (C) 2002 Elsevier Science B.V. All rights reserved.