LITHIUM/SULFUR SECONDARY BATTERY WITH GRAPHITIC NANO FIBER MEMBRANE, WHICH HAS IMPROVED DISCHARGING CAPACITY AT ROOM TEMPERATURE

摘要

PURPOSE: Provided is lithium/sulfur secondary battery with improved discharging capacity at room temperature by adapting graphitic nano fiber (GNF) membrane between anode and electrolyte. CONSTITUTION: The lithium/sulfur battery comprises anode collector(11), anode(12), ionic conductive medium(14), cathode(15) and cathode collector(16). Between the anode(11) and the ionic conductive medium(14), graphite nano fiber membrane(13) is added. The membrane(13) is prepared by conducting ultra-sonic treatment for 5 hours, and adding PvdFco-HFP copolymer and self-stirring the copolymer for 24 to 48 hours. PVdF-co-HFP polymer and the graphitic nano fiber are 70:30 to 80:20 ratio by weight.