Electrochemical performance of all-solid-state lithium batteries with mechanochemically activated Li2S-Cu composite electrodes

The Li2S-Cu active materials were prepared by mechanochemical activation using a planetary ball mill apparatus. The all-solid-state cells of In/Li2S-P2S5 glass-ceramic/Li2S-CU were constructed. The cell using the 75Li(2)S center dot 25Cu (mol%) electrode exhibited the highest initial capacity of about 490 mAh g(-1) in the Li2S-Cu system at the current density of 64 mu A cm(-2). The utilization of carbon composite electrodes Li2S-Cu-C, which was prepared by mechanical milling for the mixture of the Li2S-Cu powder milled beforehand and acetylene-black powder, was effective in enhancing the rate capability of all-solid-state cells. The cells with the Li2S-Cu-C electrode was charged and discharged at the high current densities more than 1 mA cm(-2) at room temperature. (C) 2008 Elsevier B.V. All rights reserved.