Characterization of all-solid-state lithium secondary batteries using CuxMo6S8-y electrode and Li2S-P2S5 solid electrolyte

All-solid-state cells were fabricated using CuxMo6S8-y Chevrel-phase as an active material and Li2S-P2S5 glass-ceramics as a solid electrolyte. The cells showed good cycle performance with a constant capacity of about 100 mAh g(-1) for 2000 cycles at the current density of 1.28 mA cm(-2) at room temperature. The reaction mechanism in the all-solid-state cells was investigated using X-ray diffraction (XRD). The XRD pattern after the 100th charge was almost identical to that before cycling; it is therefore considered that the retention of the crystal structure during cycling brings about a good cycle performance. The use of CuxMo6S8-y as an electrode and Li2S-P2S5 glass-ceramics as a solid electrolyte led to the formation of a good solid-solid interface using impedance spectroscopy. All-solid-state cells using CuxMo6S8-y as an active material and the 70Li(2)S center dot 30P(2)S(5) (mol%) glass-ceramic as a solid electrolyte worked at a high current density of 12.8 mA cm(-2) at a high temperature of 160 degrees C and retained a reversible capacity of about 270 mAh g(-1) for 10 cycles. (C) 2008 Elsevier B.V. All rights reserved.