Synthesis, characterization and electrochemical performance of high-density aluminum substituted α-nickel hydroxide cathode material for nickel-based rechargeable batteries

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2014.07.098
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume270
Pages121130; # of pages: 10
Subjectα-Nickel hydroxide; High tap-density; Nickel-based rechargeable batteries; Cathode materials
AbstractPositive electrode active materials, Al-substituted α-Ni(OH) 2, with a high tap-density and high performance for alkaline nickel-based rechargeable batteries have successfully been synthesized using a polyacrylamide (PAM) assisted two-step drying method and subsequent hydrothermal treatment at 140 °C for 2 h. X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), laser particle size analysis, tap-density measurement, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge-discharge test are used to characterize the physical and electrochemical properties of the synthesized material. The tap-density of the resulting powders reaches 1.84 g cm-3, which is significantly higher than that of α-Ni(OH)2 powders obtained by the conventional co-precipitation (CCP) and hydrothermal (HT) methods. Compared with commercial spherical β-Ni(OH)2, the resulting sample is electrochemically more active, providing discharge capacities of 315.0 and 255.2 mAh g-1, and volume capacities of 579.6 and 469.6 mAh cm -3 at rates of 0.2 C and 5 C, respectively. It is also found that although the hydrothermal treatment has a slight negative effect on the tap-density, it can improve the crystallinity of α-Ni(OH)2 and promote the anion exchange of NO3 - by OH-, resulting in a much better electrochemical performance.
Publication date
LanguageEnglish
AffiliationEnergy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21272915
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Record identifieree4af9c5-2198-44d9-9744-76f76862ebf7
Record created2014-12-03
Record modified2016-05-09
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