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›› 2003, Vol. 20 ›› Issue (3): 381-387.DOI: 10.7523/j.issn.2095-6134.2003.3.020

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Study on AB5-Type Hydrogen Storage Alloys for High-Power Nickel-Metal Hydride Batteries

YE Hui, ZHANG Hong   

  1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2002-12-31 Online:2003-05-10
  • Supported by:

    supported by Knowledge In novation Project of Chinese Academy of Sciences

Abstract:

Developing hydrogen storage alloys with high-rate dischareability is the key to extend the application of nickel/metal-hydride (Ni/MH)batteries to high-power fields.Based on the discussion of the thermodynamic and kinetic behaviors, the influence of the microstructure on discharge rate behavior of AB-type hydrogen storage alloys has been investigated.The results show that the addition of B and Mo can significantly improve the discharge capability at high-rate and also at low temperature due to the introduction of the non-stoichiometry with B/A >5 and secondary phase with catalytic activity.Again combined with the optimization of the rare earth composition in A side, a kind of MmNi3.55Co0.75Mn0.4Al0.3Bx alloy (Mm:mischmetal)with excellent rate characteristics has been developed.This kind of alloy is promising for Ni/MH batteries in both high power and low temperature applications.

Key words: AB5-type hydrogen storage alloy, high-rate discharge capability, low temperature performance microstructure, high-power Ni/MH battery

CLC Number: