Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries

Nickel hydroxide is widely used as the active material in positive electrodes in most nickel-based rechargeable alkaline batteries. The theoretical capacity of nickel hydroxide is 289 mAhg-1. The capacity of these batteries depends on the specific capacity of the positive electrode and the utilizati...

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Detalles Bibliográficos
Autores principales: Real, Silvia, Ortiz, Mariela, Castro, Élida Beatriz
Formato: Documento de conferencia publishedVersion docunento de conferencia
Lenguaje:Inglés
Publicado: Annual Meeting of the International Society of Electrochemistry 2017
Materias:
additives; electrochemical behaviour ; nickel hydroxide electrodes; batteries
Acceso en línea:http://hdl.handle.net/20.500.12272/2461
Aporte de:
RIA - Repositorio Institucional Abierto (UTN) de Universidad Tecnológica Nacional
id I68-R174-20.500.12272-2461
record_format dspace
institution Universidad Tecnológica Nacional
institution_str I-68
repository_str R-174
collection RIA - Repositorio Institucional Abierto (UTN)
language Inglés
topic additives; electrochemical behaviour ; nickel hydroxide electrodes; batteries
spellingShingle additives; electrochemical behaviour ; nickel hydroxide electrodes; batteries
Real, Silvia
Ortiz, Mariela
Castro, Élida Beatriz
Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
topic_facet additives; electrochemical behaviour ; nickel hydroxide electrodes; batteries
description Nickel hydroxide is widely used as the active material in positive electrodes in most nickel-based rechargeable alkaline batteries. The theoretical capacity of nickel hydroxide is 289 mAhg-1. The capacity of these batteries depends on the specific capacity of the positive electrode and the utilization of the active material because of the positive electrode capacity limitation. The poor conductivity of active material requires the addition of some additives to increase conductivity and, additionally, to increase the oxygen evolution potential, the charge efficiency and to inhibit the development of γ-NIOOH phase. Many studies have been published on nickel hydroxide with different additives to obtain optimum performance; for example: cobalt [1-2], carbonaceous materials [3], calcium [3], zinc [2] and nanomaterials [4]. In this work, we have studied the electrochemical behaviour of nickel hydroxide electrodes containing additives as: cobalt (by electroless technique), nanosized Ni(OH)2 (by direct mix with active material) and MWCNTs (incorporated to active material during hydrothermal synthesis). Their electrochemical characterization was investigated by using cyclic voltammetry, charge-discharge cycling, and electrochemical impedance spectroscopy (EIS) techniques. The experimental EIS data are used to identify the model parameters by fitting the theoretical impedance function; this was derived from the physicochemical model based on the theory of porous electrodes with the charge/discharge processes occurring at the active material/electrolyte interface [5]. The results are found to be useful to determine the key factors responsible of the electrochemical performance of nickel hydroxide electrodes.
format Documento de conferencia
publishedVersion
docunento de conferencia
author Real, Silvia
Ortiz, Mariela
Castro, Élida Beatriz
author_facet Real, Silvia
Ortiz, Mariela
Castro, Élida Beatriz
author_sort Real, Silvia
title Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
title_short Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
title_full Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
title_fullStr Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
title_full_unstemmed Effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
title_sort effect of different additives on the electrochemical behaviour of nickel hydroxide electrodes employed in batteries
publisher Annual Meeting of the International Society of Electrochemistry
publishDate 2017
url http://hdl.handle.net/20.500.12272/2461
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AT ortizmariela effectofdifferentadditivesontheelectrochemicalbehaviourofnickelhydroxideelectrodesemployedinbatteries
AT castroelidabeatriz effectofdifferentadditivesontheelectrochemicalbehaviourofnickelhydroxideelectrodesemployedinbatteries
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