Structural and electrochemical characterization of nickel hydroxide obtained by the new synthesis route of electrodialysis. a comparison with spherical β-Ni(OH)2

Both structural and electrochemical properties of non-doped nickel hydroxide produced by a new synthesis route of electrodialysis are investigated. A comparison with two spherical β-type Ni(OH)₂ is made. Structural characterization is carried out by X-ray diffraction, vibrational spectroscopy and thermal analysis. Electrochemical properties are studied by cyclic voltammetric and chronoamperometric experiments. The material obtained by electrodialysis is found to have a highly defective structure, which corresponds to a complex electrochemical behavior. More particlarly, it is shown that this new nickel hydroxide is more stable regarding the β → γ transformation. Project financed by the E.U. under the Brite Euram program (#BRPR-CT97-0515) Paper presented at the 6th Euroconference on Solid State Ionics, Sept. 12–19, 1999, Cetraro, Calabria, Italy