| 摘要 |
PURPOSE:To improve the discharge characteristic of a positive electrode by heat-treating chemically synthesized PbO2 at 290-500 deg.C. CONSTITUTION:When chemically synthesized PbO2 is heated for a preset period at 290-500 deg.C, thermal decomposition occurs from the surface to some depth. The generated material depends on the treating temperature, and the thermal decomposition quantity depends on the treatment time. The surface layer of PbO2 crystal is converted into an oxide with a grade lower than that of PbO2. When it is brought into contact with dilute sulfuric acid of an electrolyte, lead sulfate is generated, and the crystal surface of the chemically synthesized PbO2 is electrochemically activated during the process to return it to PbO2 via electrolytic oxidation. The discharge characteristic of a positive electrode using it is sharply improved. |
