Calcium metaborate as a cathode additive to improve the high-temperature properties of nickel hydroxide electrodes for nickel-metal hydride batteries

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2014.03.134
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume263
Pages110117; # of pages: 8
SubjectNickelemetal hydride battery; High-temperature performance; Soluble calcium salt; Calcium metaborate; Cycle stability
AbstractIn this paper, a novel additive, calcium metaborate (CMB), is proposed to improve the high-temperature characteristics of the nickel electrodes for nickel-metal hydride batteries. As a soluble calcium salt, CMB can easily and uniformly be dispersed in the nickel electrodes. The effects of CMB on the nickel electrode are investigated via a combination of cyclability, capacity retention, electrochemical impedance spectroscopy, scanning electron microscope and X-ray diffraction. Compared with conventional nickel electrodes, the electrode containing 0.5 wt.% CMB exhibits superior electrode properties including enhanced discharge capacity, improved high-rate discharge ability and excellent cycle stability at an elevated temperature (70 °C). The improved cell performance of the nickel electrode containing CMB additives can be attributable to the increased oxygen evolution overvoltage and slower oxygen evolution rate. Compared with insoluble calcium salts, such as Ca(OH) 2, CaCO3, and CaF2, CMB is more effective as a cathode additive to improve the high-temperature performance of Ni-MH batteries.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21272739
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Record identifierd0349e0e-14da-47ca-96f6-559cce2d7409
Record created2014-12-03
Record modified2016-05-09
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