SOLID-STATE BATTERY USING COPPER-ION CONDUCTIVE SOLID ELECTROLYTE SHEET AND COPPER CHEVREL PHASE COMPOUND ELECTRODE FLEXIBLE SHEETS

A solid state rechargeable battery using a copper ion conductive solid electrolyte sheet of Rb4Cu16I7Cl13 and copper Chevrel phase compound electrode sheet of Cu2Mo6S7.8 was developed. Styrene-ethylene-butadiene-styrene copolymer rubber was admixed with the electrolyte and electrode powers to make the solid battery flexible and to minimize the leak current through the solid electrolyte sheet. The volume fraction of the rubber was optimized to be 65% in the electrolyte and 10% in the electrode. The cell with optimized electrolyte and electrode sheets provided a high current output of 10 mA/cm2 with over 60% of utilization of the Chevrel electrode, holding 70% of its initial capacity after 78 days storage at 80-degrees-C.