Electrochemical Properties of Sn Doped AB5 Non-Stoichiometric Hydrogen Absorbing Alloys-Ⅱ
来源期刊：JOURNAL OF RARE EARTHS2001年第1期
论文作者：彭文杰 王志兴 陈启元 李新海 郭炳昆 郭华军
Abstract: The effects of some substituting elements on the specific discharge capacity, activation and cycling life of AB5 non-stoichiometric hydrogen absorbing alloys were studied electrochemically. Results show that the characteristics of hydrogen absorbing alloys under low current density are greatly improved through the substitution of Ni by Sn, Co, and Mn. Three hydrogen storage alloys, i.e., La(NiSn)5.14, La(NiSnCo)5.12 and La(NiSnMn)5.12 have the higher specific capacity and easy activation. However, Al in the alloy shows the opposite effect on the electrochemical properties. Under high current density, the discharge capacity and potential of La(NiSn)5.14 is superior to La(NiSnCo)5.12 and La(NiSnMn)5.12, but the cycling life of La(NiSn)5.14 is very short. The addition of Mn, Co and Al to the alloys improves the cycling characteristics. In all these alloys, La(NiSnCo)5.12 is considered as an ideal hydrogen storage alloy.
彭文杰1，王志兴1，陈启元1，李新海1，郭炳昆1，郭华军1
(1.Institute of Metallurgical Physico-Chemistry and Materials, Central South University of Technology,)
Abstract:The effects of some substituting elements on the specific discharge capacity, activation and cycling life of AB5 non-stoichiometric hydrogen absorbing alloys were studied electrochemically. Results show that the characteristics of hydrogen absorbing alloys under low current density are greatly improved through the substitution of Ni by Sn, Co, and Mn. Three hydrogen storage alloys, i.e., La(NiSn)5.14, La(NiSnCo)5.12 and La(NiSnMn)5.12 have the higher specific capacity and easy activation. However, Al in the alloy shows the opposite effect on the electrochemical properties. Under high current density, the discharge capacity and potential of La(NiSn)5.14 is superior to La(NiSnCo)5.12 and La(NiSnMn)5.12, but the cycling life of La(NiSn)5.14 is very short. The addition of Mn, Co and Al to the alloys improves the cycling characteristics. In all these alloys, La(NiSnCo)5.12 is considered as an ideal hydrogen storage alloy.
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