Evolution mechanism of the Na<sub>0.6</sub>CoO<sub>2</sub> conductive additive during cycling in the alkaline electrolyte of Ni–MH batteries
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| hal.structure.identifier | Direction de la recherche | |
| dc.contributor.author | DOUIN, Myriam | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GUERLOU-DEMOURGUES, Liliane | |
| hal.structure.identifier | Direction de la recherche | |
| dc.contributor.author | GOUBAULT, Lionel | |
| hal.structure.identifier | Direction de la recherche | |
| dc.contributor.author | BERNARD, Patrick | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DELMAS, Claude | |
| dc.date.issued | 2009 | |
| dc.identifier.issn | 0013-4651 | |
| dc.description.abstractEn | The<sup> </sup>stability of the Na<sub>0.6</sub>CoO<sub>2</sub> phase, as intended to be used<sup> </sup>as a conductive additive at the positive electrode of Ni–MH<sup> </sup>batteries, was tested in electrochemical cycling conditions, in KOH alkaline<sup> </sup>electrolyte. Simple aging of Na<sub>0.6</sub>CoO<sub>2</sub> in the electrolyte entails its<sup> </sup>spontaneous transformation into a mixture of y and B(III) cobalt oxyhydroxides. This reaction, occurring within the solid state, is based<sup> </sup>on an original mechanism, which involves cationic exchange processes and<sup> </sup>passes through an intermediate interstratified phase. Electrochemical oxidation of Na<sub>0.6</sub>CoO<sub>2</sub><sup> </sup>in the alkaline electrolyte, as well as chemical oxidation, leads<sup> </sup>to a y cobalt oxyhydroxide, which can be totally reduced<sup> </sup>to B(III), depending on the reduction conditions. It is important<sup> </sup>to understand such an evolution mechanism of the Na<sub>0.6</sub>CoO<sub>2</sub> additive<sup> </sup>because it will have a significant and positive influence on<sup> </sup>the electrochemical cycling of the positive electrode in specific deep<sup> </sup>discharge or low potential storage conditions. | |
| dc.language.iso | en | |
| dc.publisher | Electrochemical Society | |
| dc.subject.en | Ageing | |
| dc.subject.en | Electrochemical electrodes | |
| dc.subject.en | Electrolytes | |
| dc.subject.en | Ion exchange | |
| dc.subject.en | Nickel compounds | |
| dc.subject.en | Oxidation | |
| dc.subject.en | Reduction (chemical) | |
| dc.subject.en | Secondary cells | |
| dc.subject.en | Sodium compounds | |
| dc.title.en | Evolution mechanism of the Na<sub>0.6</sub>CoO<sub>2</sub> conductive additive during cycling in the alkaline electrolyte of Ni–MH batteries | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1149/1.3111842 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of The Electrochemical Society | |
| bordeaux.page | A459-A467 | |
| bordeaux.volume | 156 | |
| bordeaux.issue | 6 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00388983 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00388983v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20The%20Electrochemical%20Society&rft.date=2009&rft.volume=156&rft.issue=6&rft.spage=A459-A467&rft.epage=A459-A467&rft.eissn=0013-4651&rft.issn=0013-4651&rft.au=DOUIN,%20Myriam&GUERLOU-DEMOURGUES,%20Liliane&GOUBAULT,%20Lionel&BERNARD,%20Patrick&DELMAS,%20Claude&rft.genre=article |
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