Abstract
The partial substitution of Zr for La has been performed in order to ameliorate the electrochemical hydrogen storage performances of La–Mg–Ni based A2B7-type electrode alloys. The melt spinning technology was used to prepare the La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1 (x=0, 0.05, 0.1, 0.15, 0.2) electrode alloys. The impacts of the melt spinning and the substituting La with Zr on the structures and the electrochemical hydrogen storage characteristics of the alloys were systemically investigated. The analysis of XRD and TEM reveals that the as-cast and spun alloys have a multiphase structure, composing of two main phases (La, Mg)2Ni7 and LaNi5 as well as a residual phase LaNi2. The electrochemical measurement indicates that both the substitution of Zr for La and the melt spinning ameliorate the electrochemical cycle stability of the alloys dramatically. Furthermore, the high rate discharge ability (HRD) of the as-spun (10 m/s) alloys notably declines with growing the amount of Zr substitution, while it first augments and then falls for the (x=0.1) alloy with rising the spinning rate.
Highlights
With rapid development of electric equipments, the requirement for new electrode materials with superior performances, especially high discharge capacity and electrochemical hydrogen storage kinetics, has become more and more pressing
The Chinese researchers in this area were deeply frustrated by a fact that the production of the new type alloys as the negative electrode in Ni–MH battery has not been found in China as a result of little poor electrochemical cycle stability of the electrode alloys
The A2B7-type La0.75−xZrxMg0.25Ni3.2 Co0.2Al0.1 (x=0-0.2) alloys were prepared by melt spinning, and a systematic investigation on the effects of the substitution of Zr for La and the melt spinning on the electrochemical cycle stability and kinetics of the electrode alloys has been performed
Summary
With rapid development of electric equipments, the requirement for new electrode materials with superior performances, especially high discharge capacity and electrochemical hydrogen storage kinetics, has become more and more pressing. The National High Technology Research and Development Program of China (for short “863” Program) provides powerful financial support in order to promote the industrialization of these new-type alloys. Such a lot of efforts have been dedicated to realizing this target and dramatic progress has been achieved, about which Liu et al have published a perfect summarization recently [3,4]. The A2B7-type La0.75−xZrxMg0.25Ni3.2 Co0.2Al0.1 (x=0-0.2) alloys were prepared by melt spinning, and a systematic investigation on the effects of the substitution of Zr for La and the melt spinning on the electrochemical cycle stability and kinetics of the electrode alloys has been performed
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