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Batteries 2015, 1(1), 54-73; doi:10.3390/batteries1010054

Effects of Salt Additives to the KOH Electrolyte Used in Ni/MH Batteries

1,†
,
1,2,* and 1,†
1
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
2
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Joeri Van Mierlo
Received: 21 September 2015 / Revised: 16 November 2015 / Accepted: 18 November 2015 / Published: 27 November 2015
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
View Full-Text   |   Download PDF [769 KB, uploaded 3 December 2015]   |  

Abstract

KOH-based electrolytes with different salt additives were investigated to reduce their corrosive nature toward Mg/Ni metal hydride alloys used as negative electrodes in nickel metal hydride (Ni/MH) batteries. Alkaline metal halide salts and oxyacid salts were studied as additives to the traditional KOH electrolyte with concentrations varying from 0.005 M to 1.77 M. Effects of the cations and anions of the additives on charge/discharge performance are discussed. The reduction potential of alkaline cations and radii of halogen anions were correlated with initial capacity and degradation of the metal hydride alloy. A synergistic effect between KOH and some oxyacid salt additives was observed and greatly influenced by the nature of the salt additives. It was suggested that both the formation of a solid film over the metal hydride surface and the promotion of proton transfer in the additives containing electrolytes led to a decreased degradation of the electrodes and an increased discharge capacity. 12 salt additives, NaC2H3O2, KC2H3O2, K2CO3, Rb2CO3, Cs2CO3, K3PO4, Na2WO4, Rb2SO4, Cs2SO4, NaF, KF, and KBr, were found to increase the corrosion resistance of the MgNi-based metal hydride alloy. View Full-Text
Keywords: nickel metal hydride (Ni/MH) battery; electrolyte additives; corrosion; MgNi based anodes; alkaline halides nickel metal hydride (Ni/MH) battery; electrolyte additives; corrosion; MgNi based anodes; alkaline halides
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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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Yan, S.; Young, K.-H.; Ng, K.S. Effects of Salt Additives to the KOH Electrolyte Used in Ni/MH Batteries. Batteries 2015, 1, 54-73.

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