| 摘要 |
PURPOSE:To improve the charging and discharging capacity and life cycle, by giving a heat treatment to MnO2 powder alone or to an integration into which the mixed powder of MnO2 and another metallic oxide is pressed, giving a crush and oxidizing treatment by nitric acid, and drying by heat. CONSTITUTION:After giving a heat treatment to MnO2 powder alone or to an integration into which the mixed powder of MnO2 and another metallic oxide is pressed, the MnO2 alone or the crushed powder of the mixture is given an oxidizing treatment by nitric acid, and dried by heat. The MnO2 powder, if partly changed into a low grade oxide such as Mn2O2, etc., by the heat treatment, the Mn2O2 can again be restored to its original MnO2 through the successive oxidizing treatment by nitric acid. This enables the obtaining of MnO2 powder not including a low grade oxide. The substance is used for positive electrode active substance of a positive electrode plate 1 to improve the discharge capacity and life cycle. |
