INVESTIGADORES
ORTIZ Mariela Gisela
artículos
Título:
Dynamic monitoring of structural changes in nickel hydroxide electrodesduring discharge in batteries
Autor/es:
MARIELA GISELA ORTIZ; DANIELA BECKER; GUILLERMO GARAVENTTA; ARNALDO VISINTIN; ELIDA CASTRO; SILVIA REAL
Revista:
ELECTROCHIMICA ACTA
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 56 p. 7946 - 7954
ISSN:
0013-4686
Resumen:
The nickel hydroxide electrode is used as the positive plate of many rechargeable battery systems such as thenickel/cadmium, nickel/hydrogen,and nickel/metal hydrides. The electrochemical energy storage in the nickel hydroxide electrodes is related to the reversible characteristics of there do couple nickel hydroxide/oxhydroxide. In the present work we describe the use of the electrochemical impedance spectroscopy (EIS) technique as a tool to characterize the dynamic behaviour of nickel hydroxide electrodes at  different states of discharge (SOD) in KOH 7M electrolytic solutions. The parameter identification procedure allows the estimation of the active area per unit volume, the solution conductivity as well as diffusion and kinetic constants related to the process, that represent very important parameters to evaluate the electrode performance.