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The influences of Al substitution for Ni on the phase abundance, structures and electrochemical properties of La0.63Gd0.2Mg0.17Ni3.0-xCo0.3Alx (x = 0.0, 0.1, 0.2, 0.3, 0.4) alloys have been investigated. The main phase of Al-free base alloy is Ce2Ni7-type phase, Gd2Co7-type phase and CeNi3-type phase. After a little Al substitution, AB3 phase shifts to A2B7 phase. Further Al addition promotes the formation of CaCu5-type phase over the A2B7-type phase. The sample of x = 0.1 (AB3 to A2B7) increases cycling stability and its discharge capacity almost unchanged. The further addition of Al (A2B7 to CaCu5) still increases cycling stability, but decreases the maximum discharge capacity and high rate dischargeability. The substitution of Al elements increases the phase abundance of A2B7-type or CaCu5-type so as to improve the cycling stability. The ability of phase pulverization resistance of the metal hydride alloy at the negative electrode appeared to be the intrinsic reason of failure mode of this series of alloys.

Phase Structure and Electrochemical Performances of La0.63Gd0.2Mg0.17Ni3.0-xCo0.3Alx (x = 0.0, 0.1, 0.2, 0.3, 0.4) Alloys