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Erschienen in: Rare Metals 8/2017

11.04.2016

Microstructure and electrochemical properties of La0.8–x MM x Mg0.2Ni3.1Co0.3Al0.1 (x = 0, 0.1, 0.2, 0.3) alloys

verfasst von: Na Zhou, Wen-Bo Du, Pei-Long Zhang, Yong-Guo Zhu, Zhao-Hui Wang, Ke Liu, Shu-Bo Li

Erschienen in: Rare Metals | Ausgabe 8/2017

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Abstract

The present study aims to improve electrochemical properties of the La–Mg–Ni-based hydrogen storage alloys through partial substitution for La by mischmetal (MM). The La0.8–x MM x Mg0.2Ni3.1Co0.3Al0.1 (x = 0, 0.1, 0.2, 0.3) alloys were prepared by inductive melting, and their phase structures and electrochemical properties were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectrometry (EDX) and electrochemical tests. Results show that the alloys mainly consist of La2Ni7-type phase, La5Ni19-type phase, LaNi5-type phase and LaNi3-type phase. The addition of MM does not change the phase compositions, while it leads to more uniform phase distribution and obviously promotes the formation of La2Ni7-type phase which possesses favorable electrochemical properties. Electrochemical studies indicate that the substitution for La by MM could effectively improve the high rate dischargeability (HRD) of the alloy electrode, and the optimal value of HRD1500 (HRD at 1500 mA·g−1) increases from 40.63 % (x = 0) to 60.55 % (x = 0.3). Although the activation properties of the alloy electrodes keep almost unchanged, both the maximum discharge capacity (C max) and the cycling stability are significantly improved by MM addition.

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Metadaten
Titel
Microstructure and electrochemical properties of La0.8–x MM x Mg0.2Ni3.1Co0.3Al0.1 (x = 0, 0.1, 0.2, 0.3) alloys
verfasst von
Na Zhou
Wen-Bo Du
Pei-Long Zhang
Yong-Guo Zhu
Zhao-Hui Wang
Ke Liu
Shu-Bo Li
Publikationsdatum
11.04.2016
Verlag
Nonferrous Metals Society of China
Erschienen in
Rare Metals / Ausgabe 8/2017
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-016-0716-5

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