TY - JOUR
T1 - Performance improvement of pasted nickel electrodes with an addition of ball-milled nickel hydroxide powder
AU - Song, Q. S.
AU - Chiu, C. H.
AU - Chan, S. L.I.
N1 - Funding Information:
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).
PY - 2006/9/15
Y1 - 2006/9/15
N2 - Spherical β-Ni(OH)2 was modified by a low-cost method of normal ball milling (NBM), and the physical properties of both ball-milled and un-milled Ni(OH)2 were characterized by transmission electron microscopy, specific surface area, particle size distribution and X-ray diffraction. It was found that NBM could obviously increase the surface area, 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. NBM also lowered the packing density and flowability of Ni(OH)2, as revealed by the measurements of tapping density and angle of repose. 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 ball-milled Ni(OH)2 addition could enhance the charging efficiency, specific discharge capacity, discharge voltage and high-rate capability of the electrodes. This performance improvement could be attributed to a more compact electrode microstructure, better reaction reversibility and lower electrochemical impedance, as indicated by scanning electron microscopy, cyclic voltammetry 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 Ni(OH)2 to spherical Ni(OH)2 as the active material.
AB - Spherical β-Ni(OH)2 was modified by a low-cost method of normal ball milling (NBM), and the physical properties of both ball-milled and un-milled Ni(OH)2 were characterized by transmission electron microscopy, specific surface area, particle size distribution and X-ray diffraction. It was found that NBM could obviously increase the surface area, 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. NBM also lowered the packing density and flowability of Ni(OH)2, as revealed by the measurements of tapping density and angle of repose. 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 ball-milled Ni(OH)2 addition could enhance the charging efficiency, specific discharge capacity, discharge voltage and high-rate capability of the electrodes. This performance improvement could be attributed to a more compact electrode microstructure, better reaction reversibility and lower electrochemical impedance, as indicated by scanning electron microscopy, cyclic voltammetry 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 Ni(OH)2 to spherical Ni(OH)2 as the active material.
KW - Electrochemical performance
KW - Electrode microstructure
KW - Nickel hydroxide
KW - Normal ball milling
KW - Pasted nickel electrode
UR - http://www.scopus.com/inward/record.url?scp=33747852390&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2006.04.041
DO - 10.1016/j.electacta.2006.04.041
M3 - 期刊論文
AN - SCOPUS:33747852390
SN - 0013-4686
VL - 51
SP - 6548
EP - 6555
JO - Electrochimica Acta
JF - Electrochimica Acta
IS - 28
ER -