Abstract: Due to its low cost，rich sources，environmental friendliness，and huge specific capacitance， nickel hydroxide has widely been investigated as an electrode material in pseudocapacitance. Herein，we introduced some preparation methods of the Ni（OH）₂ electrode and analyzed the strength and weakness of these methods. At the same time，the application of Ni（OH）₂ and its composite electrode materials（including Ni（OH）₂/other metal hydroxides/oxides，Ni（OH）₂/carbon materials，and Ni（OH）₂/conductive polymers）in the supercapacitors were reviewed，and the influence of the morphology， microstructure，and conductivity on the electrochemical performance of the supercapacitor was discussed.

Key words: supercapacitors, nickel hydroxide, electrode materials, pseudocapacitance