Microstructure and Electrochemical Distinctiveness of P-Nickel Hydroxide by means of Zinc Additive and pH

摘要

The properties of zinc additive and precipitation pH values on the electrochemical and microstructural characteristics of P-nickel hydroxide materials prepared by co-precipitation method have been studied. All the prepared nickel hydroxide samples showed an irregular flakes shape. A correlation between structural characteristics and electrochemical activity of β-nickel hydroxide has been established. The degree of crystallinity, crystallite size and crystal inter sheet distance of β-Ni(OH)2 were strongly associated with the pH values of the co-precipitation reaction. The electrochemical activity is represented by the (101) diffraction line, which increases with rising pH and the percentage of zinc additive. The percentage of SO4~(2-), CO3~(2-) and H2O molecules adsorbed by p-Ni(OH)2 crystals and the thermal stability of β-Ni(OH); were related to pH. In moderately elevated pH values, the prepared β-Ni(OH)2 materials possessed a condensed crystallite size and the substandard thermal stability. All these characteristics were expected to obtain better electrochemical activity from p-nickel hydroxide in nickel based secondary batteries.