Electrochemical performance of multi-element doped α-nickel hydroxide prepared by supersonic co-precipitation method

► The α-nickel hydroxides doped with several elements were prepared by supersonic co-precipitation method. ► Cyclic voltammetry and electrochemical impedance spectroscopy show sample C has the best electrochemical performance. ► The charge/discharge tests show that the 0.5 C discharge capacity (346 mAh/g) of sample C is even larger than that (337 mAh/g) at 0.1 C rate, while the discharge capacity at 0.5 C rate is much lower than that at 0.1 C rate for samples A and B.