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

Abstract:

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.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 2942-2945
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.2942
• Online since: October 2013
• Authors: Xiao Rui Gao*, Kang Le Jiang, Yu Qiao Wang, Yong Jing Hao
• Keywords: Electrochemical Performance, Metal Ions, Nickel Hydroxide Electrode, Nickel/Metal Hydride Battery

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