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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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Electrochemical performance of multiphase nickel hydroxide
LUO Fang-chen(罗方承)1, 2, CHEN Qi-yuan(陈启元)1,YIN Zhou-lan(尹周澜)1

1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Jiangxi Kingan High-Tech Co. Ltd, Nanchang 330508, China

Abstract:The high density nano-crystalline multiphase nickel hydroxide containing at least three doping elements was synthesized and its electrochemical characteristics were studied. The electrochemical behavior of the high density spherical multiphases α-Ni(OH)2 were also investigated. The results show that the structure of the material is a mixed phase of α-Ni(OH)2 and b-Ni(OH)2, which has a the same stabilized structure as α-Ni(OH)2 during long-term charge/discharge process. High density spherical multiphases α-Ni(OH)2 have a much better redox reversibility, a much lower oxidation potential of Ni(Ⅱ) than the corresponding oxidation state in the case of b-Ni(OH)2, and a much higher reduction potential. They exchange one electron during electrochemical reaction and have a higher proton diffusion coefficient. The mechanism of the electrode reaction is proton diffusion, and the proton diffusion coefficient is 5.67´10−10 cm2/s. Moreover, they reveal a higher discharge capacity than b-Ni(OH)2/b-NiOOH because they exchange one electron per nickel atom during charge/discharge process.

 

Key words: multiphase nickel hydroxide; electrochemical performance; voltammogram; exchange electron number; manganese

ISSN 1672-7029
CN 43-1423/U

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