Some effects of cobalt hydroxide upon the electrochemical behaviour of nickel hydroxide electrodes
1989; Elsevier BV; Volume: 25; Issue: 2 Linguagem: Inglês
10.1016/0378-7753(89)85001-3
ISSN1873-2755
Autores Tópico(s)Advanced battery technologies research
ResumoThe effects of cobalt addition upon the behaviour of the nickel hydroxide electrode have been studied using linear potential sweep, EDAX, scanning electron microscopy, and X-ray analysis. Thin film, homogeneous electrodes prepared by cathodic deposition from nitrate solutions containing 0 – 100% cobalt were examined and were found to exhibit a change in oxidation level achieved by the nickel along with a change in film structure. The nickel component reached a maximum oxidation level of (IV) when around 50% cobalt was present and the electrode capacity was also maximised at this level of additive. Evidence of a two-step oxidation process was observed over a 25% – 75% cobalt range, and the changes in electrode behaviour have been shown to be related to the film morphology. X-ray analysis showed that the addition of cobalt stabilised the alpha-and gamma-phases of the active material. Die Einflusse des Kobaltzusatzes bei der Nickelhydroxidelektrode wurden mit linearer Potentialvariation, EDAX sowie SEM untersucht. Homogene Dunnschichtelektroden (durch Kathodenablagerung ans Nitratloosungen, 0 – 100% Kobalt, dargestellt) wiesen eine Nickeloxidationstufenanderung zusammen mit einer Anderung der Schichtstruktur vor. Bei einen 50%-Kobaltzusat erreichte der Nickelkomponent seine maximale Oxidationsstufe von IV; unter disen Umstanden wurde auch die Elektrodenkapazitat maximiert. Im Bereich 25 – 75% Kobalt wurde ein zweistufiger Oxidationsprozess beobachtet. Die Wandlingen der Elektrodeneigeneschaften hangen mit der Schichtstruktur zusammen.
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