物理化学学报 >> 1996, Vol. 12 >> Issue (08): 704-708.doi: 10.3866/PKU.WHXB19960807

研究论文 上一篇    下一篇

金属氢化物电极的化学活化

陈卫祥,唐致远,刘昭林,郭鹤桐   

  1. 天津大学应用化学系,天津 300072
  • 收稿日期:1996-02-05 修回日期:1996-03-25 发布日期:1996-08-15
  • 通讯作者: 陈卫祥

Chemical Activation of Metal Hydride Electrodes

Chen Wei-Xiang,Tang Zhi-Yuan,Liu Zhao-Lin,Guo He-Tong   

  1. Department of Applied Chemistry,Tianjin University,Tianjin 300072
  • Received:1996-02-05 Revised:1996-03-25 Published:1996-08-15
  • Contact: Chen Wei-Xiang

摘要:

通过对Mm(NiMnCoAl)5电极的化学活化处理提高了金属氢化物电极的容量、电催化活性、活化性能和快速放电能力;讨论了化学活化处理对金属氢化物电极电化学性能的影响;在活化剂KBH4作用下,金属氢化物表面的氧化物技还原,在活化过程中一部分氢原子贮入合金之中,增加了电极的比表面,文中试验了这种活化方法对Ni/MH电池封口化成的作用,测试结果表明封口化成的AA型Ni-MH电池性能与开口化成电池的性能相当,其容量达到1050~1150mA.h,1C、3C、SC信率下放电容量分别达到0.2C下的96.7%、89.0%、83.8%

关键词: 金属氢化物电极, 电催化, 活化, 封口化成

Abstract:

 Metal hydride (Mm(NiMnCoAl)5) electrodes were chemically activated to improve their caparitiy, electrocatalytic activity, activation characteristics, and high-rate discharge ability. The influences of chemical action on the electochemical properties of metal hydride electrodes and sealed formation of Ni-MH batteries were discussed. Under the action of activator the oxide on the surface of hydrogen storage alloys were reduced and eliminated. The atomic hydrogen could penetrate into the lattice forming hydride. In addition, the specific surface area of MH electrode increased. It was found that the performances of Ni-MH batteries by sealed formation approached to those of the batteries by open formation. The discharge capacity of the AA size Ni-MH battery is about 1050~1150 mA•h. The capacities at 1C, 3C and 5C rate reach 96.7%, 89.0% and 83.8%of that at 0.2C rate respectively.

Key words: Metal hydride electrodes, Electrocatalytic activity, Activation, Sealed formation