In this paper, rare earth Y-doped amorphous nano-sized nickel hydroxide powder was prepared through the method of micro emulsion deep freeze deposition with the system of Tween-80/n-C4H9OH/c-C6H12/NiSO4 solution. XRD, SAED, SEM, TEM, EDS, Raman, IR, and particle size distribution and specific surface area measurements were used to analyze the structure and morphology of the material samples. Their charge-discharge performance and electrochemical impedance spectroscopy were also studied. The results showed that the disorder intensity of amorphous nickel hydroxide is increased, the average particle size is decreased and the specific surface area is also increased by adding rare earth Y, to the benefit of decreasing solution resistance, charge transfer resistance and Warburg impedance for the sample electrodes due to the increase of discharge specific capacity. The discharge specific capacity is 333.3 mAh·g-1 when adding 4% Y (mass fraction) at a charge-discharge system of 0.2 C and a cut-off voltage of 1 V if used for the anode materials of MH-Ni battery