Synthesis of Nonstoichiometric Amorphous Mg-Based Alloy Electrodes by Mechanical Milling

L. Sun, University of Wollongong
H. K. Liu, University of Wollongong
D. H. Bradhurst, University of Wollongong
S. X. Dou, University of Wollongong

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This article was originally published as Sun, L, Wang, GX, Liu, HK, Bradhurst, DH and Dou, SX, Synthesis of Nonstoichiometric Amorphous Mg-Based Alloy Electrodes by Mechanical Milling, Electrochemical and Solid-State Letters, 3(3), 2000, 121-124. Copyright The Electrochemical Society. Original journal available here.

Abstract

Nonstoichiometric amorphous Mg-Ni and Mg-Ni-V alloys were synthesized by mechanical milling the crystalline Mg2Ni alloy with Ni and/or V powders. All the nonstoichiometric amorphous Mg-based alloys result in Mg-based alloy electrodes with very high discharge capacities by comparison with crystalline Mg2Ni alloys. The results indicate that nonstoichiometric amorphous Mg-based alloys can be obtained either by increasing the Ni content, adding a range of other elements, or both, using a mechanical milling method. The nonstoichiometric Mg-based alloy electrodes studied have shown improved initial discharge capacities compared with the stoichiometric amorphous MgNi alloy. These results describe a method of achieving better Mg-based alloy electrodes with high discharge capacities and improved cycle life. The method enables a larger composition range to be achieved with a range of vanadium additions.