FeWO₄Cl as cathode material for lithium rechargeable battery

Sookhyeon Im (1) , Jinhee Park (1) , Heesung Oh (1) , Jin-Ho Choy (2) , Claude Delmas (3) , Kyoo-Seung Han (1)

1 Department of Fine Chemical Engineering and Chemistry
2 National Nanohybrid Materials Laboratory, School of Chemistry
3 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Lithium has been electrochemically and chemically intercalated into layered FeWP₄Cl. The discharge curve between FeW0₄Cl and Li₂FeWO₄Cl is constituted by three potential plateaux and two domains where the cell voltage decreases rapidly upon the intercalation of lithium ions. A wide bi-phase domain is obtained for x in Li_xFeW0₄Cl ranging between 0.0 and 0.85. The limit of a solid solution extends in the vicinity of the LiFeWO₄Cl composition. The theoretical and practical discharge capacities for Li_1-xFeWO₄Cl are 79.03 mAh/g and 78.45 mAh/g respectively. The structures of FeWO₄Cl and LiFeWO₄Cl were determined: from single crystal analysis and by Rietveld refinement of the powder X-ray diffraction pattern respectively. The modifications of the Fe-O bond lengths emphasize the iron reduction during the discharge process. Moreover, the strong change of Fe-Cl distance suggests a reversible framework modification.

Mots clés: FeWO₄Cl; Lithium rechargeable battery; Cathode; Intercalation

Domaines: Matériaux

Sookhyeon Im, Jinhee Park, Heesung Oh, Jin-Ho Choy, Claude Delmas, et al.. FeWO₄Cl as cathode material for lithium rechargeable battery. Journal of Electroceramics, 2009, 23 (2-4), pp.305-311. ⟨10.1007/s10832-008-9444-z⟩. ⟨hal-00468336⟩