| 摘要 |
PURPOSE:To obtain a lithium secondary battery whose cycle characteristic is improved by using a specific mixed liquid as the organic solvent of an electrolyte in which lithium salts are dissolved. CONSTITUTION:A lithium secondary battery comprises a case 1 serving as a positive electrode terminal, a sealing plate 2 serving as a negative electrode terminal, a gasket 3 made of polypropylene insulating the case and the sealing plate from each other, a positive electrode 4 formed by high temperature vacuum drying of a sheet of manganese dioxide etc., and pressed to a positive electrode current collector 5 initially welded to the case 1, metal lithium 6 pressed to a negative electrode current collector 7, and a separator 8 formed by a microporous film made from polypropylene. A mixed solution consisting of propylene carbonate, ethylene carbonate and dimethyl sulfoxide is used as the organic solvent of an electrolyte having lithium salts dissolved therein. A lithium secondary battery whose cycle characteristic is improved is thus obtained. |
