物理化学学报 >> 2006, Vol. 22 >> Issue (09): 1151-1154.doi: 10.3866/PKU.WHXB20060923

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MH电极中氢扩散系数的测定及其应用

胡道中;陈实;王子冬;赵淑红   

  1. 北京理工大学化工与环境学院, 北京 100081; 中国北方车辆研究所, 国家863计划电动车重大专项动力电池测试基地, 北京 100072
  • 收稿日期:2006-03-10 修回日期:2006-04-20 发布日期:2006-09-04
  • 通讯作者: 陈实 E-mail:csbit@bit.edu.cn

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 E-mail:csbit@bit.edu.cn

摘要: 利用恒流放电法测定了金属氢化物(MH)电极中氢原子扩散系数的平均值. 通过恒电位法测定了MH电极中氢原子的扩散系数与其荷电态(SOC)的关系. 根据MH电极模型可知, 增大氢原子扩散系数或减小储氢合金粒径均能提高MH电极的快速充电性能, 并能计算出MH电极在不同的初始荷电态、不同充电倍率下, 表面氢原子浓度达到最大值所需的时间.

关键词: MH电极模型, 氢原子扩散系数, 快速充电, 内压

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