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

摘要

The Li2S-Cu active materials were prepared by mechanocbemical 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 75Li2S.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 μA 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.