Enhancement of the high-temperature performance of advanced nickel-metal hydride batteries with NaOH electrolyte containing NaBO2

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DOIResolve DOI: http://doi.org/10.1016/j.ijhydene.2013.06.005
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TypeArticle
Journal titleInternational Journal of Hydrogen Energy
ISSN0360-3199
Volume38
Issue25
Pages1061610624; # of pages: 9
SubjectConventional batteries; Cycle stability; Electrochemical impedance; Nickel metal hydride battery; Oxygen evolution overpotential; Sodium metaborate; Steady state polarization; Nickel cadmium batteries; Oxygen; Sodium; Electrolytes
AbstractIn this paper, an alternative approach to improve the high-temperature performance of nickel-metal hydride (Ni-MH) batteries is proposed by introducing NaOH electrolyte with sodium metaborate (NaBO2) additives. Compared with conventional batteries using KOH electrolyte, the in-house prepared batteries with proposed electrolytes exhibit an enhanced discharge capacity, improved high-rate discharge ability, increased cycle stability and reduced self-discharge rate at an elevated temperature (70 °C). The charge acceptance of these Ni-MH batteries at 70 °C is over 96% at a charge/discharge rate of 1 C. These performance improvements are ascribed to the increased oxygen evolution overpotential, slower oxygen evolution rate and lower electrochemical impedance, as indicated by CV, steady-state polarization measurements 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 number21270453
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Record identifierfa3324dc-40f4-4ad0-a1ef-49f97ceee98f
Record created2014-02-12
Record modified2016-05-09
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