Effects of Ni-P Coatings on the Electrochemical Properties of the La0.67Mg0.33Ni2.5Co0.5 Hydrogen Storage Alloy Electrode

Abstract:

The effects of Ni-P coatings on the electrochemical properties of La0.67Mg0.33Ni2.5Co0.5 hydrogen storage alloy electrode was studied. The kinetic properties of the alloy electrode were evaluated. The results show that the cycling stability of the electrode is improved. The Ni-P coated powder electrode is better than bare electrode in exchange current density I0, Limiting current density I1, high rate dischargeability and hydrogen diffusion coefficient D. It is found that the surface microencapsulation is ineffective in prohibiting disintegration, main reason for which is probably ascribed to the larger expansion of the La0.67Mg0.33Ni2.5Co0.5 hydrogen storage alloy hydride.