Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (09): 1151-1154.doi: 10.3866/PKU.WHXB20060923

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The Measurement and Application of Hydrogen Diffusion Coefficient in MH Electrode

HU Dao-Zhong;CHEN Shi;WANG Zi-Dong;ZHAO Shu-Hong   

  1. School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, P. R. China; China North Vehicle Research Institute, Battery Test Base of 863 Special Project for Electric Vehicle, Beijing 100072, P. R. China
  • Received:2006-03-10 Revised:2006-04-20 Published:2006-09-04
  • Contact: CHEN Shi

Abstract: The average value of hydrogen diffusion coefficient in metal hydride (MH) electrode was measured by constant current discharge method. The relationship between hydrogen diffusion coefficient and state of charge (SOC) was determined by potentiostatic method. According to the MH electrode model, the fast charging performance of MH electrode can be improved by increasing hydrogen diffusion coefficient or decreasing the particle size of hydrogen storage alloy. The time when the surface hydrogen atom concentration on the MH electrode reaches maximum value under different initial states of charge and charge rates also can be calculated.

Key words: Model of MH electrode, Hydrogen diffusion coefficient, Fast charging, Inner pressure