Chinese Journal of Applied Chemistry ›› 2011, Vol. 28 ›› Issue (11): 1323-1330.DOI: 10.3724/SP.J.1095.2011.00694

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The Charge and Discharge Properties and the Optimum Formulation of a Positive Electrode of Nickel Metal Hydride Batteries

YANG Zhiyu, HU Meng, JI Xiaodan, LEI Lixu*   

  1. (School of Chemistry and Chemical Engineering,Southeast University,Nanjing 211189)
  • Received:2010-11-22 Revised:2011-01-20 Published:2011-11-10 Online:2011-11-10
  • Contact: Hu Meng

Abstract:

Two layered double hydroxides, [Ni4Al(OH)10]OH and [Co4Al(OH)10]NO3, were synthesized by chemical co-precipitation. The former was used as the active material and the latter as well as graphite were used as the conductive additives, respectively. The optimum ratio of the three materials in a positive electrode was estimated through the simplex-centroid design to improve the charge/discharge properties efficiently at a high current density. When the mass fractions of [Ni4Al(OH)10]OH, [Co4Al(OH)10]NO3 and graphite are 64.45%, 12.27% and 23.28%, respectively, the discharge capacity can retain 270.5 mA·h/g(88.7% of the maximum) after 200 cycles a current density of 800 mA/g.

Key words: [Ni4Al(OH)10]OH, [Co4Al(OH)10]NO3, simplex-centroid design, charge and discharge at high current density

CLC Number: