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Zhang P.,Whole Win Beijing Materials Science and Technology Co. | Zhu Y.,Whole Win Beijing Materials Science and Technology Co. | Luo G.,Whole Win Beijing Materials Science and Technology Co. | Ge J.,Whole Win Beijing Materials Science and Technology Co. | And 2 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2012

Rare earth-Mg-Ni-based hydrogen storage alloys were a new group of negative electrode materials with superlattice structures in which the AB 5 units and the AB 2 units were stacked with certain ratio along the c-axis direction. Because of high capacity and good activation ability, the alloys were widely concerned. But this kind of alloy exhibited poor cycling stability and high rate dischargeability. For commercial applications, numerous efforts to improve cycling stability were undertaken and studied. However, high rate dischargeability of the alloys was not able to meet the demand of hybrid electronic vehicles, and further efforts were in need. The influences of modification techniques such as element substitution, multi-component alloying, preparation technology, composite technology and surface treatment to the high rate dischargeability of rare earth-Mg-Ni-based hydrogen storage alloys were studied. Element substitution was found to be a significant means. The specific function of the constituent elements including rare earth elements and B-side elements was discussed. It was found that optimum composition of B-side contained mainly Ni, Co, Mn, and Al. As a complex process, how to find the synergy and mechanism of multi-component alloying became the key work. Taking optimized experimental scheme, and such modification techniques, rare earth-Mg-Ni-based hydrogen storage alloys with improved high rate dischargeability at industrial scale of electric tools application would be obtained. Hopefully, high rate dischargeablity of the alloys could be further improved in next work, which could meet the demand of hybrid electronic vehicles. So the study had significant economic and social benefits.


Zhang P.,University of Science and Technology Beijing | Zhang P.,Whole Win Beijing Materials Science and Technology Co. | Song X.,University of Science and Technology Beijing | Yang Z.,Whole Win Beijing Materials Science and Technology Co. | And 3 more authors.
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | Year: 2010

The technical level of the batteries is still the bottleneck constraining the development of the whole electric vehicle industry. While the high-rate discharge of the hydrogen storage alloys is the main factors affecting the performance of Ni/MH batteries, so the development of high-power hydrogen storage alloys is the hot spots at present. The effect of Mn, Zr and La content on the electrochemical properties of AB5.2-type Zr involved high-power hydrogen storage alloys was studied. The result showed that the Zr content should not be higher than 0.01, La/Mm should not be higher than 70%, and Mn content should be 0.4~0.6 depending on the value of La/Mm. The composition of the alloys was optimized and the alloy MmNi3.89Co0.4Mn0.6Al0.3 Zr0.01 with good high rate discharge performance was developed.

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