High-Temperature Electrochemical Performance of Amorphous Nickel Hydroxide Codoped with Y and Mg

Abstract

Amorphous nickel hydroxide codoped with Y and Mg was synthesized by micro-emulsion precipitation method combined with rapid freezing technique. The physical properties and micro-structural features of the prepared sample were characterized and high-temperature electrochemical performance was analyzed by cyclic voltammetry and charge/discharge tests, respectively. The results indicate that this amorphous nickel hydroxide codoped with Y and Mg has more structural defects and better thermal stability, therefore results in a relatively high specific capacity(332.46 mAh•g-1 at a charge/discharge rate of 0.2C) and a high middle discharge voltage of 1.265V at 60°C. Moreover, the Y and Mg codoped amorphous nickel hydroxide exhibits good electrochemical reaction reversibility and structural stability.