Abstract: The metal-hydride electrode of MH/Ni batteries was modified with a thin conductive film using plasma technology. The experimental results demonstrated that the resistance of the batteries with the modified electrode was decreased by 24％,the discharge capacity was remarkably increased, discharge capacity at 5C (7.5 A) was increased by 200 mA•h and discharge voltage was increased by 0.14 V, the conductive film also restrained the pulverization of the hydrogen storage alloy and the battery with modified electrode exhibited satisfactory durability, the inner pressure of batteries was also decreased . The performance of the batteries showed an obvious improvement.

Key words: MH/Ni batteries, Plasma technology, Surface modification, Electrode