Enhanced electrochemical performance of high-density Al-substituted α-nickel hydroxide by a novel anion exchange method using NaCl solution

High-density Al-substituted α-nickel hydroxide with interlayer NO3− for alkaline nickel-based rechargeable batteries has been synthesized using a polyacrylamide (PAM) assisted two-step drying method. In order to improve its electrochemical performance, Al-substituted α-Ni(OH)2 with interlayer NO3− i...

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Bibliographic Details
Published in:International journal of hydrogen energy 2015-01, Vol.40 (4), p.1852-1858
Main Authors: Li, Jing, Shangguan, Enbo, Nie, Mengzhen, Jin, Qingxiao, Zhao, Kang, Chang, Zhaorong, Yuan, Xiao-Zi, Wang, Haijiang
Format: Article
Language:English
Subjects:
Activation
Aluminum
Anion exchange
Anion exchanging
Cathode materials
Electrochemical analysis
Electrochemical impedance spectroscopy
Exchange
Hydroxides
Interlayers
Nickel-based rechargeable batteries
Scanning electron microscopy
α-Nickel hydroxide
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Summary:High-density Al-substituted α-nickel hydroxide with interlayer NO3− for alkaline nickel-based rechargeable batteries has been synthesized using a polyacrylamide (PAM) assisted two-step drying method. In order to improve its electrochemical performance, Al-substituted α-Ni(OH)2 with interlayer NO3− is modified by a simple anion exchange method using NaCl solution. The physical and electrochemical properties of the synthesized material are characterized by means of X-ray diffraction (XRD), infrared spectroscopy (IR), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and a charge–discharge test. Compared with NO3− intercalated α-Ni(OH)2 precursor, the resulting Cl− intercalated α-Ni(OH)2 samples possess more excellent electrochemical activities, including higher proton diffuse coefficient, lower electrochemical impedance, higher specific capacity, and better cyclic stability. Especially, it is also found that the introduction of Cl− can greatly accelerate the activation process of α-Ni(OH)2 electrodes. •An anion exchange method to enhance the performance of α-Ni(OH)2 is first reported.•The enhancement of the activation rate of high-density α-Ni(OH)2 is significant.•The Cl− intercalated α-Ni(OH)2 possess more excellent electrochemical activities.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.11.150