| 摘要 |
PURPOSE:To increase discharge capacity and lengthen life by controlling pH of a positive active material having a specified composition to 10 or less. CONSTITUTION:A positive active material is a composite oxide having layer structure or spinel structure represented by LiMxOy (M is at least one of Co, Ni, Mn, and Fe.), and whose pH is 10 or less. The active material is mixed with acetylene black and polytetrafluoroethylene powder in a weight ratio of 85:10:5, and toluene is added to the mixture, then they are kneaded, molded in a sheet, blanked in a disc, then heated under reduced pressure to obtain a positive electrode 1. The positive electrode is pressed against a positive can 4 through a current collector. A negative electrode 2 is formed by blanking a lithium foil in a disc, and pressed against a negative can 5 through a current collector. An electrolyte prepared by dissolving LiClO4 in propylene carbonate is used. A lithium battery is assembled with the positive electrode 1, the negative electrode 2, the electrolyte, and a separator 3. |
