title: Iron(III) phosphates obtained by thermal treatment of the Tavorite-type FePO4·H2O material: structures and electrochemical properties in lithium batteries.
abstract: Thermal treatment of the Tavorite-type material FePO(4)·H(2)O leads to the formation of two crystallized iron phosphates, very similar in structure. Their structural description is proposed taking into account results obtained from complementary characterization tools (thermal analyses, diffraction, and spectroscopy). These structures are similar to that of the pristine material FePO(4)·H(2)O: iron atoms are distributed between the chains of corner-sharing FeO(6) octahedra observed in FePO(4)·H(2)O and the octahedra from the tunnels previously empty, in good agreement with the formation of a Fe(4/3)PO(4)(OH)-type phase. The formation of an extra disordered phase was also proposed. These samples obtained by thermal-treatment of FePO(4)·H(2)O also intercalate lithium ions through the reduction of Fe(3+) to Fe(2+) at an average voltage of ~2.6 V (vs Li(+)/Li), with a good cyclability and a reversible capacity around 120 mA h g(-1) (>160 mA h g(-1) during the first discharge).
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, IPB-ENSCBP, 87 av. Schweitzer, 33608 Pessac cedex, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Marx
authors.forename: Lydie
authors.initials: L
authors.lastname: Bourgeois
authors.forename: Dany
authors.initials: D
authors.lastname: Carlier
authors.forename: Alain
authors.initials: A
authors.lastname: Wattiaux
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Suard
authors.forename: Frédéric
authors.initials: F
authors.lastname: Le Cras
authors.forename: Laurence
authors.initials: L
authors.lastname: Croguennec