| 摘要 |
PURPOSE:To improve a charge/discharge cycle life and a capacity keeping factor, by composing a hydrogen storage electrode with hydrogen storage alloy, a PVdF bonding agent, conductive material, and remaining pores having a specific ratio respectively to be heat-treated. CONSTITUTION:A hydrogen storage electrode has ranges of a hydrogen storage alloy of 42-84vol.%, a bonding agent of 3-13vol.%, a conductive material of 3-15vol.%, and a remaining pore of 10-30vol.%. Polyvinyldene fluoride is used as the bonding agent, the mean grain diameter for the conductive material is made 1.3mum, and is heattreated. This heat-treatment is prefarable to perform in a range of about 160-200 deg.C in vacuum or an inactive gas atmosphere. Consequently, the bonding network can maintain its initial stage condition for a long time even in the alkaline electrolyte, improving a capacity keeping factor with the falling of alloy grains properly prevented and a charge/discharge cycle prolonged. |
