On the Na x Ni0.6Co0.4O2System: Physical and Electrochemical Studies
Identifieur interne : 000320 ( Istex/Curation ); précédent : 000319; suivant : 000321On the Na x Ni0.6Co0.4O2System: Physical and Electrochemical Studies
Auteurs : I. Saadoune [Maroc] ; A. Maazaz [Maroc] ; M. Ménétrier [France] ; C. Delmas [France]Source :
- Journal of Solid State Chemistry [ 0022-4596 ] ; 1996.
Abstract
Sodium chemical deintercalation from the NaNi0.6Co0.4O2phase was realized by using iodine as oxidizing agent. The Na0.58Ni0.6Co0.4O2phase obtained was used as the positive electrode in sodium batteries. Several structural transformations were observed during discharge (intercalation reaction). The magnetic and electrical study of the NaxNi0.6Co0.4O2(x= 1, 0.80, 0.58) phases shows clearly that NiIII(t62e1in LS configuration) is preferentially oxidized to the tetravalent state compared to CoIII(t62e0in LS configuration). The sodium diffusion coefficient was also calculated in the solid solution domains. It shows that the diffusion kinetics is faster when sodium ions are situated in a prismatic environment.
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DOI: 10.1006/jssc.1996.0090
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<front><div type="abstract" xml:lang="en">Sodium chemical deintercalation from the NaNi0.6Co0.4O2phase was realized by using iodine as oxidizing agent. The Na0.58Ni0.6Co0.4O2phase obtained was used as the positive electrode in sodium batteries. Several structural transformations were observed during discharge (intercalation reaction). The magnetic and electrical study of the NaxNi0.6Co0.4O2(x= 1, 0.80, 0.58) phases shows clearly that NiIII(t62e1in LS configuration) is preferentially oxidized to the tetravalent state compared to CoIII(t62e0in LS configuration). The sodium diffusion coefficient was also calculated in the solid solution domains. It shows that the diffusion kinetics is faster when sodium ions are situated in a prismatic environment.</div>
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