Reversible oxygen participation to the redox processes revealed for Li1.20Mn0.54Co0.13Ni0.13O2
KOGA, Hideyuki
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Toyota Motor Europe NV/SA
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Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Toyota Motor Europe NV/SA
KOGA, Hideyuki
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Toyota Motor Europe NV/SA
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Toyota Motor Europe NV/SA
BOURGEOIS, Lydie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut des Sciences Moléculaires [ISM]
< Reduce
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Institut des Sciences Moléculaires [ISM]
Language
en
Article de revue
This item was published in
Journal of The Electrochemical Society. 2013, vol. 160, n° 6, p. A786-A792
Electrochemical Society
English Abstract
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, ...Read more >
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.Read less <
English Keywords
Solid solution
Lithium
Batteries
Redox process
Intercalation compounds
Origin
Hal imported