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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Acknowledgements
This work was supported by the Tianjin Municipal Natural Science Foundation of China (Grant No. 05YFJMJC09900), and by the Project-sponsored by SRF for ROCS, the Ministry of Education of China (Grant No. 2004-176).
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SONG, Q., CHIU, C. & CHAN, S. Effects of ball milling on the physical and electrochemical characteristics of nickel hydroxide powder. J Appl Electrochem 36, 97–103 (2006). https://doi.org/10.1007/s10800-005-9045-3
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DOI: https://doi.org/10.1007/s10800-005-9045-3