Effects of ball milling on the physical and electrochemical characteristics of nickel hydroxide powder |
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| Authors: | QS SONG CH CHIU SLI CHAN |
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| Affiliation: | (1) Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, P.R. China;(2) Department of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan;(3) School of Materials Science and Engineering, University of New South Wales, Sydney, NSW, 2052, Australia |
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| Abstract: | Nickel hydroxide powder was modified by the method of ball milling, and the physical properties of both the ball-milled and
un-milled nickel hydroxide were characterized by scanning electron microscopy, specific surface area, particle size distribution
and X-ray diffraction. It was found that the ball milling processing could obviously increase the surface area, decrease the
particle and crystallite size, and reduce the crystallinity of β-Ni(OH)2, which was advantageous to the improvement of the electrochemical activity of nickel hydroxide powder. Electrochemical performances
of pasted nickel electrodes using the ball-milled nickel hydroxide as an active material were investigated, and were compared
with those of the electrodes prepared with the un-milled nickel hydroxide. Charge/discharge tests showed that the ball-milled
nickel hydroxide electrodes exhibited better performances in the charging efficiency, specific discharge capacity, active
material utilization and discharge voltage. The improvement of the performances of β-Ni(OH)2 through ball milling could be attributed to the better reaction reversibility, higher coulombic efficiency, higher oxygen
evolution potential and lower electrochemical impedance, as indicated by the cyclic voltammetry and electrochemical impedance
spectroscopy studies. Thus, ball milling was an effective method to modify the physical properties and enhance the electrochemical
performances of nickel hydroxide powder for the active material of rechargeable alkaline nickel batteries. |
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| Keywords: | ball milling electrochemical performance nickel hydroxide particle and crystallite size pasted nickel electrode structural characteristics |
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