胶态电解质锂硫电池电化学性能研究

Study on electrochemical property of gelled polymer electrolyte lithium-sulfur battery

采用多壁碳纳米管与升华硫在一定条件下合成了一种新型纳米复合材料。用该复合材料作为正极活性物质所制备的锂电池,分别在液态电解质和胶态聚合物电解质中进行了充放电性能比较。结果表明:胶态锂硫电池比液态锂硫电池具有更好的循环性能、更高的比容量和比能量。这种胶态电解质抑制了锂硫电池中单质硫本身和正极活性物质的放电产物多硫化物的溶解。

A novel muhiwalled carbon nanotubes-sulfur composite cathode material was synthesized by heating sublimed sulfur and muhiwalled carbon nanotubes（MWNTs） in certain conditions. Lithium batteries with such activated cathode were fabricated. The comparison of charge -discharge performance between liquid electrolyte battery and gelled electrolyte battery was described. The results indicated that the lithium -sulfur battery with gelled electrolyte had better cycle ability, higher specific capacity and higher specific energy. The gelled polymer electrolyte helped to restrain the solution of polysulfides produced from discharging product and the sulfur itself in the active material of cathode.