Improved Electrochemical Performance of Surface-Modified Metal Hydride Electrodes

• 作 者: YANG Kai WU Feng CHEN Shi ZHANG Cun-zhong
• 机 构: School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, Chi
• 出 处: 北京理工大学学报（英文版）
• 发表日期: 2005年4期
• 关键词: surface modification multi-arc ion plating technique electrode MH/Ni batteries

A novel plating process was applied to the surface modification of the metal hydride (MH) electrode of the MH/Ni batteries. The electrode was plated with a thin nickel film about 0.1 μm thick by using multi-arc ion plating technique. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to analyze the electrodes. Influence of the surface modification on the performance of the MH/Ni batteries was studied. It is shown that the surface modification could enhance the electrode conductivity and decrease the batteries ohimic resistance by 28.2 %. After surface modification, the discharge capacity of modification also improves the cyclic durability of the batteries. The inner pressure of the batteries with modified electrode during overcharging is much lower than that with unmodified electrode. The experimental results demonstrate that this process is an effective way for the surface modification of the electrode of MH/Ni batteries.