Preparation and Study of Spherical Nickel Hydroxide Coated by Cobalt Oxy-Hydroxide

Abstract:

Nanometer nickel hydroxide particles coated by cobalt oxy-hydroxide are prepared through chemical precipitation method. The properties of coated Ni(OH)2 particles is characterized by using X-ray diffraction, scanning electron microscopy, constant current charge/discharge test and cyclic voltammetry. Studies are focused on the effects of different amounts of cobalt oxy-hydroxide on structure and electrochemical characteristics of nickel hydroxide. The results show that a structure of β-Ni(OH)2 is preserved and 2.5 wt % CoOOH can form a well distributed conductive network on the surface of nickel hydroxide particles, thereby leading to higher utilization of active material; Compared to other electrodes, the electrodes with 2.5 wt % coated CoOOH show higher specific capacity and better cycling durability, and the electrodes also has better reversibility of the Ni(OH)2/NiOOH redox couple, and higher oxygen evolution potential.

• Periodical: Advanced Materials Research (Volume 668)
• Pages: 383-387
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.668.383
• Online since: March 2013
• Authors: Xin Gang Hou, Wen Wu Liu, Cai Xia Li, You Fu Wang
• Keywords: Coat, Coooh, Electrochemical Property, Nanometer Nickel Hydroxide, Phase Structure

References

[1] R.D. Armstrong, W.D. Briggs, E.A. Charles. Some effects of the addition of cobalt to the nickel electrodes [J]. Journal of Applied Electrochemistry, 2000, 18(2): 215-219.

[2] V. Pralong, Y. Chabre, A. Delahayevidal, A. Heinz. Study of the contribution of cobalt additive to the behavior of the nickel oxy-hydroxide electrode by potentiodynamic techniques [J]. Solid State Ionics, 2002, 147(2): 73-84.

DOI: 10.1016/s0167-2738(02)00009-7

[3] M. Onishi, M. Oshitani, Nickel Electrode for Alkaline Storage Battery, Japan Patent 3, 077, 271. (2004).

[4] M. Oshitani, H. Yufu, Nickel Electrode for Alkaline Battery, Japan Patent 1, 272, 050. (2006).