Study of the insertion mechanism of lithium into anatase by operando X-ray diffraction and absorption spectroscopy

Marcus Fehse (1) , Laure Monconduit (2, 1) , Florent Fischer (3) , Cécile Tessier (3) , Lorenzo Stievano (1, 2)

1 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 RS2E - Réseau sur le stockage électrochimique de l'énergie
3 SAFT [Bordeaux]

Operando X-ray diffraction (XRD) and X-ray absorption (XAS) were used to study Li+ insertion into TiO2 anatase during electrochemical cycling in a Li cell. The evolution of long range order and local structure with the amount of lithium reacted were analyzed to identify and characterize the individual insertion domains. These results agree with a three-step insertion process, firstly solid solution, followed by characteristic biphasic plateau corresponding to the transformation from tetragonal to orthorhombic phase which is succeeded by a monophasic insertion.

Domaines: Matériaux

Marcus Fehse, Laure Monconduit, Florent Fischer, Cécile Tessier, Lorenzo Stievano. Study of the insertion mechanism of lithium into anatase by operando X-ray diffraction and absorption spectroscopy. Solid State Ionics, 2014, 268, pp.252-255. ⟨10.1016/j.ssi.2014.09.018⟩. ⟨hal-01091248⟩