中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 17 No. 3 June 2007 |
SHENG Jun(盛 軍)1, HAN Xi-jiang(韓喜江)1
（1. Department of Applied Chemistry, Harbin Institute of Technology,
Harbin 150001,China;
2. Department of Product, DLG Battery (Shenzhen) Co. Ltd, Shenzhen 518109, China）
Abstract: The influence of transformation pH value on the performance of nano-scale Ni(OH)2 was analyzed. The measurement results of XRD and TEM indicate that the samples are composed of β-Ni(OH)2 with crystal size of 20−50 nm, and the crystal lattice parameters of nano-scale Ni(OH)2 prepared at different transformation pH values are different. With the increase of transformation pH value, the agglomeration of nano-scale Ni(OH)2 becomes obvious. Cyclic voltammograms(CV) and electrochemical impedance spectroscopy(EIS) measurement results show that transformation pH value affects the proton diffusion coefficient(D) and charge-transfer resistance(Rct) of the material. The specific capacity is up to 327.8 mA∙h/g, and the discharge performance of electrodes depends on both D and Rct, so the kinetic characteristics that electrodes reaction is controlled by both mass-transfer step and charge-transfer step was put forward.
Key words: nano material; Ni(OH)2; transformation pH; preparation
