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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 3    June 2007

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Effect of transformation pH on performance of nano-scale β-Ni(OH)2
ZHAO Li(赵 力)1, WANG Shou-jun(王守军)2,
SHENG Jun(盛 军)1, HAN Xi-jiang(韩喜江)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

ISSN 1672-7029
CN 43-1423/U

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