Sodium tungstate as electrolyte additive to improve high-temperature performance of nickel-metal hydride batteries

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DOIResolve DOI: http://doi.org/10.1016/j.ijhydene.2013.02.047
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TypeArticle
Journal titleInternational Journal of Hydrogen Energy
ISSN0360-3199
Volume38
Issue12
Pages51335138; # of pages: 6
SubjectCharge/discharge test; Cycle stability; Electrochemical impedance; High temperature performance; Nickel hydroxide electrode; Performance improvements; Sodium tungstate; Cyclic voltammetry; Electrochemical impedance spectroscopy; Electrolytes; Nickel cadmium batteries; Tungsten compounds; Sodium
AbstractSodium tungstate (Na2WO4) used as new electrolyte additive to enhance the high-temperature performance of Nickel-metal hydride (Ni-MH) battery is investigated in this paper. The effects of Na 2WO4 on nickel hydroxide electrodes are investigated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and a charge/discharge test. It is found that the Ni-MH cell with the conventional KOH electrolyte containing 1 wt.% Na2WO4 additive exhibits higher discharge retention and better cycling performance than the cell without Na2WO4 additive at both 25 °C and 70 °C. These performance improvements are ascribed to the enhancement of oxygen evolution overvoltage and lower electrochemical impedance, as indicated by CV and EIS. The results suggest that the proposed approach be an effective way to improve the high temperature performance of Ni-MH batteries.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21270454
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Record identifier1e56bde6-f8de-41de-a81e-108b53f90e43
Record created2014-02-12
Record modified2016-05-09
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