Studies on negative electrode of Zn-Ni battery by means of XRD

The compound of calcium zincate, of which the composition was Ca(OH)2·2 Zn(OH)2·2 H2O,was prepared by a chemical method. The crystal structure was verified by XRD. The mixture of zinc oxide and barium hydroxide was prepared by a mechanical method. The calcium zincate and the mixture of zinc oxide and barium hydroxide were used for active materials as negative electrode of Zn-Ni battery. The simulated Zn-Ni battery was assembled. The morphology changes of discharged productions of active materials in cathode and the changed current of quantity of components were studied by XRD. The results showed cathodic active materials were prepared by the calcium zincate , the discharged production zinc oxide partly changed into calcium zincate by combining with calcium hydroxide; while cathodic active materials were prepared by the mixture of zinc oxide and barium hydroxide, barium hydroxide changed into barium carbonate by combining with carbon dioxide which was dissolved in electrolyte and zinc oxide could not combine with barium hydroxide and dissolved in electrolyte quickly .