Effect of synthesis temperature on the phase structure and electrochemical performance of nickel hydroxide |
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Authors: | Yanwei Li Qingxia Yang Jinhuan Yao Zhenggang Zhang and Changjiu Liu |
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Institution: | (1) Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Department of Material and Chemical Engineering, Guilin University of Technology, Guilin, 541004, People’s Republic of China |
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Abstract: | Nickel hydroxide powder is prepared by chemical precipitation method, and the effect of synthesis temperature on the phase
structure and electrochemical performances of nickel hydroxide is investigated. The phase structure is characterized by X-ray
diffraction (XRD), and the electrochemical performances are characterized by cyclic voltammetry, electrochemical impedance
spectroscopy, and charge/discharge tests. The XRD results show that low temperatures (0–20 °C) induce the precipitation of
badly crystallized nickel hydroxide while at high temperatures (40–60 °C) crystallized β-nickel hydroxide is formed. Electrochemical
performance tests show that the nickel hydroxide synthesized at low temperature has better electrochemical reversibility,
lower electrochemical reaction impedance, and higher discharge capacity than that of the nickel hydroxide synthesized at high
temperature. |
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Keywords: | |
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