Influence of synthesis parameters on the short-range structure and electrochemical performances of Li2MnO2F
WERNERT, Romain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
SAFT [Bordeaux]
Voir plus >
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
SAFT [Bordeaux]
WERNERT, Romain
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
SAFT [Bordeaux]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
SAFT [Bordeaux]
GUIGNARD, Marie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
CARLIER, Dany
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
< Réduire
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Réseau sur le stockage électrochimique de l'énergie [RS2E]
Advanced Lithium Energy Storage Systems - ALISTORE-ERI [ALISTORE-ERI]
Langue
en
Article de revue
Ce document a été publié dans
Inorganic Chemistry. 2024, vol. 63, n° 12, p. 5341-5350
American Chemical Society
Résumé en anglais
In the last years, disordered rocksalt structure (DRS) materials were proposed as a positive electrode for lithium-ion batteries. In particular, the fluorinated DRS materials were proposed to be more stable upon cycling ...Lire la suite >
In the last years, disordered rocksalt structure (DRS) materials were proposed as a positive electrode for lithium-ion batteries. In particular, the fluorinated DRS materials were proposed to be more stable upon cycling than pure oxide counterparts. These materials are mainly obtained by mechanosynthesis in order to incorporate a significant number of F ions and maintain a disordered structure. Since the local structural arrangement is crucial for battery application, we aim to monitor its evolution upon the synthesis of Li2MnO2F from two sets of precursors: Mn2O3, Li2O, and LiF or LiMnO2 and LiF. The synthesis progress was thus followed, by 7Li and 19F MAS NMR coupled to XRD to probe the structure at different scales. This allowed us to identify an optimal milling time to reach the final compounds. We show that they exhibit similar morphology (by SEM), medium- and short-range orders (by XRD, 7Li and 19F NMR, EXAFS), and average Mn oxidation degree (by XANES). The electrochemical performances of the two compounds are almost similar, with high specific capacities of 319 mAh·g–1 (“from LiMnO2”) and 304 mAh·g–1 (“from Mn2O3”) for the first charge to 4.8 V vs Li+/Li, proving their interest as post-NMC candidates as positive electrode materials.< Réduire
Mots clés en anglais
Li-ion batteries
Positive electrode material
Disordered rocksalt
Oxyfluoride
MAS-NMR
Oxygen redox
Origine
Importé de halUnités de recherche