New Surface Modification of Zr-(1-x)Ti_x (NiVMnCo)_(2.1 hydride) Electrode

摘要

The Zr-(1-x)Ti_x (NiVMnCo)_(2.1) alloy electrodes are treated by hot charging treatment. The activation behavior, hydrogen diffusion coefficient and maximum discharging capacity, high rate discharging capability of alloy electrodes are tested. The surface element content is observed by scanning electron microscope. The results show that the surface modifications can markedly improve activation behavior and high rate charging capacity of alloy electrode. The alloy electrode is fully activated after the second charging -discharging cycle and has a high rate discharging capability of 80% at 900mA/g; The surface has a lot of micro-cracks and hydrogen diffusion coefficient is about 0.5 X 10~(-9)cm~2/s at 600mA/g. Moreover, the mechanism of the surface modifications of the alloy electrode is also discussed.