A comparative study of structural and electrochemical properties of high-density aluminum substituted α-nickel hydroxide containing different interlayer anions

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2015.02.059
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume282
Pages158168; # of pages: 11
SubjectAluminum; Cathodes; Cyclic voltammetry; Electric discharges; Electrochemical impedance spectroscopy; Electrochemical properties; Electrodes; Infrared spectroscopy; Negative ions; Nickel; Organic polymers; Scanning electron microscopy; X ray diffraction; Alpha nickel hydroxide; Anion doping; Cath-ode materials; Degree of crystallinity; Electrochemical performance; High rate discharge ability; Nickel hydroxides; Proton diffusion rates; Ions
AbstractAl-substituted α-type nickel hydroxides (α-Ni(OH)2) containing different interlayer anions (NO3 -, SO4 2-, Cl-, CO32-, OH-) are synthesized via a polyacrylamide (PAM) assisted two-step drying method. The effects of interlayer anions on the microstructure, morphology and electrochemical performance of Al-substituted α-Ni(OH)2 are investigated by X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscope (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge/discharge tests. The results demonstrate that the intercalated anions have a critical effect on the basal plane spacing, degree of crystallinity, and electrochemical properties of the end products. Especially, the intercalated anions have a marked impact on the activation process of the nickel electrodes. The Cl- intercalated α-Ni(OH)2 sample exhibits better high-rate discharge ability and cycle stability than samples with other interlayer anions. This is attributed to the higher crystallinity, better exchange ability and smaller anion size of Cl-. The anion exchange ability and the size of anions also play an important role in the proton diffusion rate, which directly affects the electrochemical properties of α-Ni(OH)2. The relationships between the specific capacity and basal spacing are also discussed in details for the five samples.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment
Peer reviewedYes
NPARC number21275723
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Record identifiereba37783-8edb-4f34-ab1d-3b8cd338d2d1
Record created2015-07-14
Record modified2016-05-09
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