| 摘要 |
PURPOSE:To obtain a positive plate which is thin and flexible and has large surface area by using very fine MnO2 powder under 325 mesh as a positive active material. CONSTITUTION:A positive plate 3 is obtained is such a way that very fine MnO2 powder under 325 mesh is heated at 340 deg.C, and 5wt% graphite powder serving as conductor and 3wt% polytetrafluoroethylene serving as binder and water are added to the MnO2 powder and they are kneaded. The mixture is rolled with a roller to make a sheet, and the sheet is pressed against a porous titanium current collector, and dried at 110 deg.C, then cut in a specified dimension. A lead plate 4 is welded to the sheet and the both sides of the welded part of the lead plate are covered with an insulating tape. The positive plate obtained is faced to a negative lithium plate with a separator comprising a microporous polypropylene film interposed and they are spirally wound by using one end of the positive plate as a winding axis to form a spiral plate group. |
