TY - GEN
T1 - Nanocrystalline nickel hydroxide in pasted nickel electrodes for rechargeable nickel batteries
AU - Song, Quansheng
AU - Chiu, C. H.
AU - Chan, S. L.I.
PY - 2006
Y1 - 2006
N2 - Nanocrystalline nickel hydroxide powder was modified by the planetary ball milling (PBM), and the physical properties of both the ball-milled and un-milled nickel hydroxides were characterized by scanning electron microscopy, specific surface area (BET), particle size distribution and X-ray diffraction. It was found that the ball milling processing could obviously increase the surface area, break up the agglomeration, decrease the particle and crystallite size, and reduce the crystallinity of β-Ni(OH)2, which were advantageous to the improvement of the electrochemical activity of Ni(OH) 2. The ball-milled nanocrystalline Ni(OH)2 was then used to alter the microstructure of pasted nickel electrodes and improve the distribution of the active material in the porous electrode substrate. Electrochemical performances of pasted nickel electrodes with an addition of ball-milled Ni(OH)2 to spherical Ni(OH)2 as the active material were investigated, and were compared with those of the pure spherical Ni(OH)2 electrodes. Charge/discharge tests showed that the addition of ball-milled Ni(OH)2 could enhance the charging efficiency, specific discharge capacity, discharge voltage and high-rate capability of pasted nickel electrodes. This performance improvement could be attributed to a more compact electrode microstructure and lower electrochemical impedance, as indicated by scanning electron microscopy and electrochemical impedance spectroscopy. Thus, it was an effective method to modify the microstructure and improve the electrochemical properties of pasted nickel electrodes by adding an appropriate amount of ball-milled nanocrystalline Ni(OH)2 to spherical Ni(OH)2 as the active material.
AB - Nanocrystalline nickel hydroxide powder was modified by the planetary ball milling (PBM), and the physical properties of both the ball-milled and un-milled nickel hydroxides were characterized by scanning electron microscopy, specific surface area (BET), particle size distribution and X-ray diffraction. It was found that the ball milling processing could obviously increase the surface area, break up the agglomeration, decrease the particle and crystallite size, and reduce the crystallinity of β-Ni(OH)2, which were advantageous to the improvement of the electrochemical activity of Ni(OH) 2. The ball-milled nanocrystalline Ni(OH)2 was then used to alter the microstructure of pasted nickel electrodes and improve the distribution of the active material in the porous electrode substrate. Electrochemical performances of pasted nickel electrodes with an addition of ball-milled Ni(OH)2 to spherical Ni(OH)2 as the active material were investigated, and were compared with those of the pure spherical Ni(OH)2 electrodes. Charge/discharge tests showed that the addition of ball-milled Ni(OH)2 could enhance the charging efficiency, specific discharge capacity, discharge voltage and high-rate capability of pasted nickel electrodes. This performance improvement could be attributed to a more compact electrode microstructure and lower electrochemical impedance, as indicated by scanning electron microscopy and electrochemical impedance spectroscopy. Thus, it was an effective method to modify the microstructure and improve the electrochemical properties of pasted nickel electrodes by adding an appropriate amount of ball-milled nanocrystalline Ni(OH)2 to spherical Ni(OH)2 as the active material.
KW - Electrochemical performance
KW - Electrode microstructure
KW - Nanocrystalline nickel hydroxide
KW - Pasted nickel electrode
KW - Planetary ball milling
UR - http://www.scopus.com/inward/record.url?scp=48749100356&partnerID=8YFLogxK
U2 - 10.1109/ICONN.2006.340567
DO - 10.1109/ICONN.2006.340567
M3 - 會議論文篇章
AN - SCOPUS:48749100356
SN - 1424404533
SN - 9781424404537
T3 - Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology, ICONN
SP - 127
EP - 129
BT - Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology, ICONN
T2 - 2006 International Conference on Nanoscience and Nanotechnology, ICONN 2006
Y2 - 3 July 2006 through 6 July 2006
ER -