Electrochemical performance of nickel hydroxide doped with
multi-wall carbon nanotubes
(1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China)
2. College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China)
Abstract: Nickel hydroxide doped with multi-wall carbon nanotubes (MCNTs) was synthesized by chemical coprecipitation method. The MCNTs doped nickel hydroxide was used as the electrochemical active material in the positive electrodes of rechargeable alkaline batteries. The powder X-ray diffraction (XRD) analysis shows that the addition of MCNTs induces more structural defect within the crystal lattice of the nickel hydroxide. The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) tests demonstrate the better reaction reversibility and lower electrochemical impedance of MCNTs doped nickel hydroxide as compared with the pure nickel hydroxide. The charge/discharge tests show that MCNTs addition can improve the specific discharge capacity and increase the discharge voltage of the nickel hydroxide electrode.
Key words: nickel hydroxide; carbon nanotube; Ni/MH batteries; specific capacity; electrochemical impedance spectroscopy