| 摘要 |
PURPOSE:To prevent an internal pressure of a cell from rising when charged at a high rate, by coating metal material having high affinity for oxygen, which is processed by oxidation, with a water-repellent film, and bringing it into contact with a negative electrode. CONSTITUTION:Metal material having high affinity for oxygen is fired and processed by oxidation at high temperature in the air. After it is soaked in suspension of water-repellence treatment agent, it is fired in the air to be coated with the water-repellence treatment agent. This obtained metal material 5 is arranged so as to be brought into contact with a negative electrode 6 in the secondary cell. Thus, under overcharged conditions, oxygen gas is generated on a positive electrode 1, and on the other hand the oxygen gas generated on the positive electrode 1 is absorbed into the metal material 5 on the negative electrode 6, and effectively reduced into water or hydroxyl ion, and therefore an internal pressure of the cell is prevented from rising. |
