Study of Li-rich lamellar oxides as positive electrode materials for lithium-ion batteries
type: Dataset
description: The charge and discharge mechanism of Li1.20Mn0.54Co0.13Ni0.13O2 was studied using several characterization tools in order to determine the origin of the high capacity observed for the system (1-x)LiMO2.xLi2MnO3 used as positive electrode for Li-ion batteries. The electrochemical results and in operando XAS analyses performed during the 1st cycle of Li//Li1.20Mn0.54Co0.13Ni0.13O2 cells suggested the possible participation of oxygen anion to the redox processes. It was supported by the in-depth analysis of materials prepared by chemical Li deintercalation and reinsertion. The results of XRD, HAADF-STEM and nanodiffraction analyses, combined with electrochemical experiments performed in different conditions (rate, temperature …), revealed that different types of reactions occur in the particles during the 1st cycle. Within the bulk Ni, Co and O are involved in the redox processes, whereas Mn is not: oxygen ions are oxidized in charge and reduced during the next discharge reversibly. At the surface, the same oxidation processes occur during the first charge, but with the release of oxygen gaz and a densification of the lattice. During the next discharge and subsequent cycles, the redox reaction occurring near the surface after the 1st charge involves thus Co, Ni and Mn.
identifier: NNT: 2013BOR14751
issued: 2026-05-07T15:52:11.895315
language: en
modified: 2026-05-07T15:52:11.895320
contact point: Organization
  fn: CCSD
keyword: charge-and-discharge-mechanism
keyword: chimothechemical-sciencesother
keyword: electrochemical-reaction
keyword: electrode-positive-pour-batteries-li-ion
keyword: infoeu-reposemanticsdoctoralthesis
keyword: li-rich-layered-oxides
keyword: mecanisme-de-charge-et-de-decharge
keyword: modifications-structurales
keyword: oxydes-lamellaires-riches-en-lithium
keyword: positive-electrode-for-li-ion-batteries
keyword: processus-redox
keyword: reaction-electrochimique
keyword: redox-processes
keyword: spiotherengineering-sciences-physicsother
keyword: structural-changes
keyword: theses
landing page: https://theses.hal.science/tel-00923812

Study of Li-rich lamellar oxides as positive electrode materials for lithium-ion batteries
type: Distribution
format: HTML
issued: 2026-05-07T15:52:11.899235
modified: 2026-05-07T15:52:11.880592
access URL: https://theses.hal.science/tel-00923812

test_moissonnage_selune
type: Agent