The self-discharge performance and charge efficiency at 60 ℃ for Ni-MH battery can be markedly enhanced by using NaOH electrolyte instead of KOH electrolyte.Both the results of electrochemical impedance spectroscopy and cyclic voltammetry tests indicate that the separation of H_2 from the negative electrode may be partly blocked in the former because of the change of the adsorption/desorption behavior of H on the surface of the negative electrode,thus results in an improvement of self-discharge performance of the battery.


Nickel-metal-hydride battery, Self-discharge, NaOH electrolyte, Electrochemical impedance spectroscopy, Cyclic voltammetry

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[1]Leb lance P,B lanchard P,Senyarich S.Self-d ischarge ofsealed n ickel-m etal hydride batteries[J].J.E lectro-chem.Soc.,1998,145:844~847.
[2]Rub in E J,Baboian R.A correlation of the solutionproperties and the electrochem ical behavior of the n ickelhydroxide electrode in b inary aqueous alkali hydroxides[J].J.E lectrochem.Soc.,1971,118:428~433.
[3]Lee J H,Lee K Y,Lee J Y.Self-d ischarge behavior ofsealed N i-MH batteries using MmN i3.3+xCo0.7A l1.0-xan-odes[J].J.A lloys Compd.,1996,232:197~203.
[4]W ang C.K inetic behavior ofm etal hydride electrode bym eans of AC impedence[J].J.E lectrochem.Soc.,1998,145:1801~1812.
[5]Castro E B,Real S G,Bonesi A,et al.E lectrochem i-cal impedence characterization of porous m etal hydrideelectrodes[J].E lectroch im.Acta,2004,49:3879~3890.
[6]Geng M,Feng F,Gamboa S A,et al.E lectrocatalyticcharacteristics of the m etal hydride electrode for ad-vanced N i/MH batteries[J].J.Power Sources,2001,96:90~93.



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