Rechargeable LiCoO2 in inorganic electrolyte solution.

The charge/discharge reaction of LiCoOsub2 electrode in an inorganic electrolyte solution consisting mainly of LiAlClsub4 and SOsub2 has been studied. Three different phases of lithium intercalation/deintercalation were found in voltammograms. Cycling behaviour of LiCoOsub2 electrode shows an increasing electronic resistance in the LiCoOsub2 bulk. The studied electrode/electrolyte combination is capable to withstand overcharging up to 5 V versus Li/Lihighplus without any capacity decrease.