Synthesis of New Fluorosulphate Materials Using Different Approaches

Mohammed Ati (1, 2) , Moulay Tahar Sougrati (1, 3) , Nadir Recham (2) , Prabeer Barpanda (2) , Marine Reynaud (2) , Charles Delacourt (2) , Michel Armand (2) , Jean-Claude Jumas (3) , Jean‐marie Tarascon (2)

1 RS2E - Réseau sur le stockage électrochimique de l'énergie
2 LRCS - Laboratoire réactivité et chimie des solides - UMR CNRS 7314
3 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier

Searching for possible new cathode materials with the ability to outperform LiFePO4, our group has recently discovered LiFeSO4F, a novel metal fluorosulphate compound. Needing no further optimization, it delivers excellent reversible capacity (~140 mAh/g) involving a 3.6 V FeII/III redox plateau. This parent fluorosulphate phase has been synthesized by three different routes, namely ionothermal synthesis, solid-state synthesis and polyol-assisted synthesis. These low temperature processing routes are described focusing on synthesis of LiFeSO4F. Furthermore, these methods were successfully employed to unravel other LiMSO4F compounds (M = Co/Ni/Mn/Zn) as well as sodium-based metal fluorosulphate NaMSO4F compounds (M = Fe/Co/Ni/Mn). These syntheses were realized at temperature not exceeding 300°C. We have discovered many interesting and at times intriguing structural, electrochemical and transport properties in these fluorosulphate materials. A few of these findings are illustrated to show the richness of the metal fluorosulphate chemistry.

Domaines: Matériaux

Mohammed Ati, Moulay Tahar Sougrati, Nadir Recham, Prabeer Barpanda, Marine Reynaud, et al.. Synthesis of New Fluorosulphate Materials Using Different Approaches. 219th ECS Meeting, 2010, United States. pp.57-63, ⟨10.1149/1.3655687⟩. ⟨hal-00815534⟩