Alpha Nickel Hydroxides as Lightweight Nickel Electrode Materials for Alkaline Rechargeable Cells

• Published in: Chemistry of materials Vol. 15; no. 4; pp. 974 - 978
• Main Authors: Hu, Wei-Kang, Noréus, Dag
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 25.02.2003
• Subjects: Applied sciences; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Exact sciences and technology; Electrochemical properties; Nickel hydroxide; Secondary cell; Electrode material; Performance; Electrode capacity; Alkaline cell
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm021312z

A lightweight nickel hydroxide electrode was obtained through developing a stable α-phase nickel hydroxide with a 10 at. % Al substitution. The effects of an Al addition within 10−30 at. % on the interslab distance of the (001) plane as well as on the electrochemical properties were investigated. Pasted α- and β-type nickel hydroxide electrodes were fabricated to compare the specific capacity, weight, and volumetric energy densities of both types of electrodes. The results showed the α-type nickel electrode to have a higher specific capacity and weight energy density than the β-type nickel electrode. The volumetric energy density of the α-type nickel electrode was, however, inferior to that of the β-type nickel electrode. Two type AA size NiMH cells were also constructed by spirally winding the α- and β-type nickel electrodes and AB5-type MH electrodes, respectively. The cell performances were evaluated.