Abstract:Five kinds of Ni(OH)2 positive materials with different chemical compositions were prepared by a chemical coprecipitation method. The compounds with Co, Zn, Ca, Mg, Cu or Mn elements were mixed with nickel sulfate and reacted with each other at a special temperature and pH value under stirring. The XRD analysis indicates that the microstructure of as-prepared materials is β-Ni(OH)2. SEM images show the particles are spherical with a little rough surface. The electrochemical results indicate that the Ni(OH)2 B has the best performances at different rates and temperatures. The discharge capacities for Ni(OH)2 B sample can achieve more than 285 mAh·g-1 at 1 C/3 C rate both at 25 and 65 oC. The experiment shows that the Ni(OH)2 positive materials with perfect properties can be synthesized by coprecipitating other elements, which is helpful for the improvement of Ni-MH batteries