A comparative study, of 1 M and 8 M KOH electrolyte concentrations, used in Ni-MH batteries
Identifieur interne : 000525 ( Main/Exploration ); précédent : 000524; suivant : 000526A comparative study, of 1 M and 8 M KOH electrolyte concentrations, used in Ni-MH batteries
Auteurs : C. Khaldi [Tunisie] ; H. Mathlouthi [Tunisie] ; Jilani Lamloumi [Tunisie]Source :
- Journal of alloys and compounds [ 0925-8388 ] ; 2009.
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Abstract
One may wonder if we really should use a very high concentration of KOH electrolyte in Ni-MH batteries, to keep the thermodynamic and kinetic properties of the alloy, while this solution is very aggressive to the used alloys. In this work we present a comparative study, using different techniques of two concentrations, 1 M and 8M KOH electrolytes. The maximum capacity values are 295 mAh g-1 and 237 mAh g-1, the loss in capacity, after 23 cycles, are of 10% and 58%, the polarization after the activation are 110 mV and 360 mV and the thickness of the corrosion layer, on the electrode surface, are 7 nm and 42 nm, for the 1 M and 8 M KOH electrolytes, respectively. These results showed that replacing the solution 8 M with 1 M improves the performance of Ni-MH batteries and leads to better results.
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Mathlouthi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT, 5 Avenue Taha Hussein</s1><s2>1008 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT, 5 Avenue Taha Hussein</s1><s2>1008 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university" n="3">Université de Tunis</orgName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">09-0228102</idno><date when="2009">2009</date><idno type="stanalyst">PASCAL 09-0228102 INIST</idno><idno type="RBID">Pascal:09-0228102</idno><idno type="wicri:Area/PascalFrancis/Corpus">000197</idno><idno type="wicri:Area/PascalFrancis/Curation">000244</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000202</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000202</idno><idno type="wicri:doubleKey">0925-8388:2009:Khaldi C:a:comparative:study</idno><idno type="wicri:Area/Main/Merge">000539</idno><idno type="wicri:Area/Main/Curation">000525</idno><idno type="wicri:Area/Main/Exploration">000525</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">A comparative study, of 1 M and 8 M KOH electrolyte concentrations, used in Ni-MH batteries</title><author><name sortKey="Khaldi, C" sort="Khaldi, C" uniqKey="Khaldi C" first="C." last="Khaldi">C. Khaldi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT, 5 Avenue Taha Hussein</s1><s2>1008 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Mathlouthi, H" sort="Mathlouthi, H" uniqKey="Mathlouthi H" first="H." last="Mathlouthi">H. Mathlouthi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT, 5 Avenue Taha Hussein</s1><s2>1008 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName></affiliation></author><author><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Mécanique, Matériaux et Procédés, ESSTT, 5 Avenue Taha Hussein</s1><s2>1008 Tunis</s2><s3>TUN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Tunisie</country><placeName><settlement type="city">Tunis</settlement><region nuts="2">Gouvernorat de Tunis</region></placeName><placeName><settlement type="city">Tunis</settlement><region type="region" nuts="2">Gouvernorat de Tunis</region></placeName><orgName type="university" n="3">Université de Tunis</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of alloys and compounds</title><title level="j" type="abbreviated">J. alloys compd.</title><idno type="ISSN">0925-8388</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Concentration effect</term><term>Electrochemical properties</term><term>Electrolyte</term><term>Kinetics</term><term>Nickel hydrogen batteries</term><term>Polarization</term><term>Potassium hydroxide</term><term>Scanning electron microscopy</term><term>Thermodynamic properties</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Effet concentration</term><term>Propriété thermodynamique</term><term>Cinétique</term><term>Polarisation</term><term>Propriété électrochimique</term><term>Microscopie électronique balayage</term><term>Electrolyte</term><term>Batterie nickel hydrogène</term><term>Hydroxyde de potassium</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">One may wonder if we really should use a very high concentration of KOH electrolyte in Ni-MH batteries, to keep the thermodynamic and kinetic properties of the alloy, while this solution is very aggressive to the used alloys. In this work we present a comparative study, using different techniques of two concentrations, 1 M and 8M KOH electrolytes. The maximum capacity values are 295 mAh g<sup>-1</sup> and 237 mAh g<sup>-1</sup>, the loss in capacity, after 23 cycles, are of 10% and 58%, the polarization after the activation are 110 mV and 360 mV and the thickness of the corrosion layer, on the electrode surface, are 7 nm and 42 nm, for the 1 M and 8 M KOH electrolytes, respectively. These results showed that replacing the solution 8 M with 1 M improves the performance of Ni-MH batteries and leads to better results.</div></front></TEI><affiliations><list><country><li>Tunisie</li></country><region><li>Gouvernorat de Tunis</li></region><settlement><li>Tunis</li></settlement><orgName><li>Université de Tunis</li></orgName></list><tree><country name="Tunisie"><region name="Gouvernorat de Tunis"><name sortKey="Khaldi, C" sort="Khaldi, C" uniqKey="Khaldi C" first="C." last="Khaldi">C. Khaldi</name></region><name sortKey="Lamloumi, J" sort="Lamloumi, J" uniqKey="Lamloumi J" first="J." last="Lamloumi">Jilani Lamloumi</name><name sortKey="Mathlouthi, H" sort="Mathlouthi, H" uniqKey="Mathlouthi H" first="H." last="Mathlouthi">H. Mathlouthi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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