Reversible densification in nano-Li 2 MnO 3 cation disordered rock-salt Li-ion battery cathodes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Materials Chemistry A Année : 2020

Reversible densification in nano-Li 2 MnO 3 cation disordered rock-salt Li-ion battery cathodes

Résumé

The full structure of nano-Li 2 MnO 3 with superior reversible capacities of 290 mA h g À1 for over 10 cycles was investigated by neutron and X-ray total scattering, which demonstrate that contrary to previous claims, a phase transformation occurs during synthesis forming a disordered cubic MnO-type rock-salt with nanodomains of Li/Mn layering of $1 nm. A comprehensive study of the structural and charge evolution combining in operando X-ray total scattering with advanced spectroscopic methods at the Mn K-edge such as High Energy Resolved Fluorescence Detected XANES, EXAFS and Emission Spectroscopies including main and valence-to-core transitions, point to a lattice densification with an effective loss of Li 2 O, with the subsequent electrochemical activation of Li 2 O as the main responsible mechanism for the exchanged capacity. Interestingly, and unlike previous studies, no capacity losses could be associated to the material's densification.
Fichier principal
Vignette du fichier
2020_JMatChemA_nano-Li2MnO3_Maria.pdf (1.56 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02906320 , version 1 (21-09-2020)

Identifiants

Citer

Maria Diaz-Lopez, Philip Chater, Yves Joly, Olivier Proux, Jean-Louis F Hazemann, et al.. Reversible densification in nano-Li 2 MnO 3 cation disordered rock-salt Li-ion battery cathodes. Journal of Materials Chemistry A, 2020, 8 (21), pp.10998-11010. ⟨10.1039/d0ta03372c⟩. ⟨hal-02906320⟩
50 Consultations
61 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More