TY - JOUR
T1 - Ball-milling processing of nanocrystalline nickel hydroxide and its effects in pasted nickel electrodes for rechargeable nickel batteries
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 - 2008/2
Y1 - 2008/2
N2 - Nanocrystalline Ni(OH) 2 powder synthesized by a chemical precipitation method was processed using the planetary ball milling (PBM), and the physical properties of both the ball-milled and unmilled Ni(OH) 2 were characterized by scanning electron microscopy (SEM), specific surface area, particle size distribution, and X-ray diffraction. It was found that the PBM processing could significantly break up the agglomeration, uniformize the particle size distribution, increase the surface area, decrease the crystallite size, and reduce the crystallinity of nanocrystalline β-Ni(OH) 2, which were advantageous to the improvement of the electrochemical activity of Ni(OH) 2. The ball-milled nanocrystalline (BMN) 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 a mixture of BMN and spherical Ni(OH) 2 as the active material were investigated, and were compared with those of pure spherical Ni(OH) 2 electrodes. Charge/discharge tests showed that BMN Ni(OH) 2 addition 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, better reaction reversibility, and lower electrochemical impedance, as indicated by SEM, 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 BMN Ni(OH) 2 to spherical Ni(OH) 2 as the active material.
AB - Nanocrystalline Ni(OH) 2 powder synthesized by a chemical precipitation method was processed using the planetary ball milling (PBM), and the physical properties of both the ball-milled and unmilled Ni(OH) 2 were characterized by scanning electron microscopy (SEM), specific surface area, particle size distribution, and X-ray diffraction. It was found that the PBM processing could significantly break up the agglomeration, uniformize the particle size distribution, increase the surface area, decrease the crystallite size, and reduce the crystallinity of nanocrystalline β-Ni(OH) 2, which were advantageous to the improvement of the electrochemical activity of Ni(OH) 2. The ball-milled nanocrystalline (BMN) 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 a mixture of BMN and spherical Ni(OH) 2 as the active material were investigated, and were compared with those of pure spherical Ni(OH) 2 electrodes. Charge/discharge tests showed that BMN Ni(OH) 2 addition 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, better reaction reversibility, and lower electrochemical impedance, as indicated by SEM, 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 BMN Ni(OH) 2 to spherical Ni(OH) 2 as the active material.
KW - Electrode microstructure
KW - Nanocrystalline nickel hydroxide
KW - Pasted nickel electrode
KW - Planetary ball milling
KW - Solid-state proton diffusion
UR - http://www.scopus.com/inward/record.url?scp=36349000645&partnerID=8YFLogxK
U2 - 10.1007/s10008-007-0370-9
DO - 10.1007/s10008-007-0370-9
M3 - 期刊論文
AN - SCOPUS:36349000645
SN - 1432-8488
VL - 12
SP - 133
EP - 141
JO - Journal of Solid State Electrochemistry
JF - Journal of Solid State Electrochemistry
IS - 2
ER -