Effect of Cobalt Addition on Structure and Electrochemical Behaviour of Nickel Hydroxide Synthesized by Chemical Precipitation Method under Different Conditions

摘要

This paper relates to research work focused on utilization of nickel hydroxide with improved electrochemical properties in rechargeable alkaline batteries where it is used as a positive material. A treatment of chemical composition, i.e. cobalt amount, and synthesis conditions of nickel hydroxide were carried out for purposes of the product optimizing ensuring excellent electrochemical parameters and their durability in long-term cycling process. Set of several samples with variously modified molar ratios of cobalt to nickel as well as precipitated from mixed nickelous and cobaltous salt solutions in different concentrations of alkaline hydroxide solutions was prepared. We applied cobalt as two species, primarily incorporated through co-precipitation and secondary as surface modification/coating of particles Ni(OH)_2. In this way prepared samples have been electrochemically tested.