Abstract: A method for preparing a Na3V2(PO4)2F3 material, including at least the steps: a) reducing the vanadium oxide, V2O5, under a reducing atmosphere in the absence of elementary carbon and in the presence of at least one phosphate anion precursor in order to form vanadium phosphate, VPO4; and b) exposing, under an inert atmosphere, a mixture of the VPO4 material obtained in step a) with an effective amount of sodium fluoride, NaF, and at least one hydrocarbon- and oxygen-containing compound which is a source of elementary carbon, to temperature conditions that are favourable for calcining said mixture so as to form said Na3V2(PO4)2F3 compound. Also, a related electrode material, an electrode and a secondary sodium battery using the presented material.

Abstract: A method for preparing a Na3V2(PO4)2F3 material, including at least the steps: a) reducing the vanadium oxide, V2O5, under a reducing atmosphere in the absence of elementary carbon and in the presence of at least one phosphate anion precursor in order to form vanadium phosphate, VPO4; and b) exposing, under an inert atmosphere, a mixture of the VPO4 material obtained in step a) with an effective amount of sodium fluoride, NaF, and at least one hydrocarbon- and oxygen-containing compound which is a source of elementary carbon, to temperature conditions that are favourable for calcining said mixture so as to form said Na3V2(PO4)2F3 compound. Also, a related electrode material, an electrode and a secondary sodium battery using the presented material.

Abstract: The invention relates to a lithium battery positive electrode material comprising a powder of over-lithiated lamellar oxide fitting the following formula (I) : wherein: x is comprised in a range from 0.1 to 0.26; a+b+c=1 with the condition that a and b are different from 0; when c is different from 0, M is a transition element other than cobalt, said powder having a specific surface area ranging from 1.8 to 6 m2/g and having a tapped density greater than or equal to 1.6 g/cm3.

Abstract: A two-phase positive electrode material for a lithium battery in which particles of lithium-enriched layered oxide of formula Li1+x(MnaNibMc)1?xO2 are at least partially coated on the surface with a metal oxide of formula LiyVOz. Such a material is advantageously produced by mixing the lithium-enriched lamellar oxide with at least one precursor of the metal oxide in aqueous solution, followed by thermal treatment at a temperature no lower than 280° C.

Abstract: The invention relates to a two-phase positive electrode material for a lithium battery, which includes particles of a lithium-enriched lamellar oxide, the surface of which is at least partially covered by a metal oxide having formula LiyVOz, wherein 0<y<3 and 2.5<z<4. The lithium-enriched lamellar oxide has the following specific formula Li1+x(MnaNibMc)1?x02, wherein: 0.1<x<0.25; a+b+c =1, a, b and c having non-zero values; and M is a metal selected from the group comprising Mg, Zn, Al, Na, Ca, K. Such a material is advantageously produced by mixing the lithium-enriched lamellar oxide with at least one precursor of the metal oxide placed in aqueous solution, followed by a step comprising thermal treatment at a temperature no lower than 280° C.