KOGA, Hideyuki; CROGUENNEC, Laurence; MÉNÉTRIER, Michel; DOUHIL, Kaïs; BELIN, Stéphanie; BOURGEOIS, Lydie; SUARD, Emmanuelle; WEILL, François; DELMAS, Claude

doi:10.1149/2.038306jes

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

KOGA, Hideyuki
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Toyota Motor Europe NV/SA

CROGUENNEC, Laurence
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

MÉNÉTRIER, Michel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Langue

Article de revue

Ce document a été publié dans

Journal of The Electrochemical Society. 2013, vol. 160, n° 6, p. A786-A792

Electrochemical Society

Résumé en anglais

Materials prepared by chemical Li deintercalation with NO2BF4 from Li1.20Mn0.54Co0.13Ni0.13O2 and chemical Li reinsertion with LiI show very similar chemical composition, oxidation state of each transition metal ion, structural properties and electrochemical performance to those of the material recovered after the 1st electrochemical cycle. Investigations combining redox titration, magnetic measurement, neutron diffraction and chemical analyzes reveal that uncommon redox processes are involved during the first charge at high voltage and explain the charge overcapacity and large reversible discharge capacity obtained for this material. This further assesses our proposal that oxygen, in addition to nickel and cobalt, participates to the redox processes in charge: within the bulk oxygen is oxidized without oxygen loss, whereas at the surface oxygen is oxidized to O2 and irreversibly lost from the structure. During the subsequent discharge, in addition to nickel, cobalt and oxygen, manganese is also slightly involved in the redox processes (reduction) to compensate for the initial surface oxygen loss.< Réduire

Mots clés en anglais

Solid solution

Lithium

Batteries

Redox process

Intercalation compounds

Métadonnées

Licence d’utilisation du document

Reversible oxygen participation to the redox processes revealed for Li1.20Mn0.54Co0.13Ni0.13O2

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche