Effect of Doped Metal Ions on the Electrochemical Performance of Nickel Hydroxide Electrode for Nickel/Metal Hydride Battery

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Positive materials for nickel/metal hydride battery, nickel hydroxide doped by different metal ions were synthesized by coprecipitation, and subsequent hydrothermal treatment and anion exchange method. The structure of the samples was analyzed by XRD test, and the electrochemical performances were studied by galvanostatic charge-discharge, cyclic voltammetry and impedance tests. The obtained electrode material shows mainly β-Ni (OH)2 structure when only doping Zn2+, while α-Ni (OH)2 structure was obtained by only doping Al3+ or co-doping Al3+ and Zn2+. Ni (OH)2 co-doped Al3+ and Zn2+ had fine cyclic stability, high number of exchanged electrons per nickel atom (the maximum is 1.93), small charge-transfer and proton-diffusion resistances.

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2942-2945

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October 2013

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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