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Batteries 2016, 2(3), 27; doi:10.3390/batteries2030027

Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides

1
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
2
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 20 April 2016 / Revised: 19 July 2016 / Accepted: 10 August 2016 / Published: 19 August 2016
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
View Full-Text   |   Download PDF [5481 KB, uploaded 19 August 2016]   |  

Abstract

Compositions of MgNi-based amorphous-monocrystalline thin films produced by radio frequency (RF) sputtering with a varying composition target have been optimized. The composition Mg52Ni39Co3Mn6 is identified to possess the highest initial discharge capacity of 640 mAh·g−1 with a 50 mA·g−1 discharge current density. Reproduction in bulk form of Mg52Ni39Co3Mn6 alloy composition was prepared through a combination of melt spinning (MS) and mechanical alloying (MA), shows a sponge-like microstructure with >95% amorphous content, and is chosen as the metal hydride (MH) alloy for a sequence of electrolyte experiments with various hydroxides including LiOH, NaOH, KOH, RbOH, CsOH, and (C2H5)4N(OH). The electrolyte conductivity is found to be closely related to cation size in the hydroxide compound used as 1 M additive to the 4 M KOH aqueous solution. The degradation performance of Mg52Ni39Co3Mn6 alloy through cycling demonstrates a strong correlation with the redox potential of the cation in the alkali hydroxide compound used as 1 M additive to the 5 M KOH aqueous solution. NaOH, CsOH, and (C2H5)4N(OH) additions are found to achieve a good balance between corrosion and conductivity performances. View Full-Text
Keywords: alkali hydroxide; organic hydroxide; electrolyte; corrosion; ionic conductivity alkali hydroxide; organic hydroxide; electrolyte; corrosion; ionic conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nei, J.; Young, K.-H.; Rotarov, D. Studies on MgNi-Based Metal Hydride Electrode with Aqueous Electrolytes Composed of Various Hydroxides. Batteries 2016, 2, 27.

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