Synthesis and Electrochemical Properties of Nano-Micro Spherical β-Ni(OH)2 with Super High Charge-Discharge Speed

A spherical beta-Ni(OH)(2) product with nano-micro structure was synthesized by a new controllable crystallization complexation precipitation method. The results show that the nano-micro spherical Ni(OH)(2) possesses superior electrochemical properties due to its own nano-micro structure. Furthermore, the new samples of cobalt-doped, zinc-doped, and cobalt-zinc codoped Ni(OH)(2) with nano-micro structure were also synthesized. The electrochemical properties of these four nano-micro spherical Ni(OH)(2) samples were investigated by galvanostatic charge-discharge and cyclic voltammetric (CV) tests. The electrochemical experimental results indicate that the diffusivity of proton of the doped Ni(OH)(2) samples is significantly improved as compared with the pure Ni(OH)(2) sample. The Co-Zn codoped Ni(OH)(2) sample offers a high discharge specific capacity of 257 mA h g(-1) and a long life of more than 800 cycles at a super high charge-discharge speed of 50 C, and the charging time of the product is as short as to 1.2 min.