Structural and electrochemical performance of additives-doped α-Ni(OH)₂

Abstract

The additives-doped α-nickel hydroxides were prepared by supersonic co-precipitation method. The crystal structure and grain size of the prepared samples were characterized by X-ray diffraction (XRD) and Particle size distribution (PSD), respectively. Cyclic voltammetry (CV) tests show that Al-Co-Y doped Ni(OH)₂ has better reaction reversibility, higher proton diffusion coefficient than those of Al-Co doped Ni(OH)₂. Al-Co-Y doped Ni(OH)₂ also has lower charge-transfer resistance as shown by electrochemical impedance spectroscopy (EIS). Charge/discharge tests show that the discharge capacity of Al-Co-Y doped Ni(OH)₂ reaches 328 mAh/g at 0.2 C and 306 mAh/g at 0.5 C, while Al-Co doped Ni(OH)₂ can only discharge a capacity of 308 mAh/g at 0.2 C and 267 mAh/g at 0.5 C.

Keywords

additives-doped / particle size distribution / reaction reversibility / proton diffusion coefficient / charge-transfer resistance

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