Abstract: A composition of active material for a positive electrode of a lithium-ion electrochemical cell is provided comprising: (a) a lithiated oxide of formula Li1+xMO2 in which: 0?x?0.15, M designates NiaMnbCocM?d where a>0; b>0; c>0; d?0 and a+b+c+d=1; M? being chosen from B, Mg, Al, Si, Ca, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, Mo or a mixture of these; (b) a lithiated phosphate of formula LiMn1?yM?yPO4 where M? represents at least one element chosen from the group consisting of Fe, Ni, Co, Mg and Zn; and 0<y<0.5; the particle size distribution of the lithiated oxide being characterized by a first volume median diameter of the particles Dv501?500 nm; the particle size distribution of the lithiated phosphate being characterized by a second volume median diameter of the particles Dv502?500 nm; and Dv502/Dv501?1.5.

Abstract: A lithium-ion electrochemical cell comprising: at least one negative electrode comprising an active material having an operating potential greater than or equal to 1 V with respect to the potential of the electrochemical couple Li+/Li; at least one positive electrode; the negative electrode and/or the positive electrode comprising a binder selected from polytetrafluoroethylene, polyamideimide, polyimide, styrene-butadiene rubber and polyvinyl alcohol or a mixture thereof; a liquid electrolyte comprising a solvent which is an ionic liquid; a separator having a shrinkage of less than or equal to 3% in the direction of its length and in the direction of its width, after exposure to a temperature of 200° C. for a period of at least one hour. This electrochemical cell can be used in charge or discharge at a temperature ranging from room temperature to 150° C. or higher.

Abstract: A lithium accumulator including: a current collector; a stack of at least two layers arranged on at least one surface of the current collector, wherein a first layer is in contact with the surface of the current collector and includes a mixture of at least two compounds selected from a lithiated manganese phosphate, a lithiated transition metal oxide, and a lithiated spinel-type manganese oxide; and an outer layer including an active material having at least 90% of a lithiated iron phosphate.

Abstract: A composition of active material for a positive electrode of a lithium-ion electrochemical cell is provided comprising: (a) a lithiated oxide of formula Li1+xMO2 in which: 0?x?0.15, M designates NiaMnbCocM?d where a>0; b>0; c>0; d?0 and a+b+c+d=1; M? being chosen from B, Mg, Al, Si, Ca, Ti, V, Cr, Fe, Cu, Zn, Y, Zr, Nb, Mo or a mixture of these; (b) a lithiated phosphate of formula LiMn1?yM?yPO4 where M? represents at least one element chosen from the group consisting of Fe, Ni, Co, Mg and Zn; and 0<y<0.5; the particle size distribution of the lithiated oxide being characterized by a first volume median diameter of the particles Dv501?500 nm; the particle size distribution of the lithiated phosphate being characterized by a second volume median diameter of the particles Dv502?500 nm; and Dv502/Dv501?1.5.

Abstract: The invention relates to a lithium accumulator comprising: a) a current collector (4); and b) a stack of at least two layers (1, 2, 3) arranged on at least one surface of the current collector, wherein a first layer (1) is in contact with the surface of the current collector and comprises a mixture of at least two compounds selected from: a lithiated manganese phosphate, a lithiated transition metal oxide, and a lithiated spinel-type manganese oxide; and an outer layer (2) comprises an active material comprising at least 90% of a lithiated iron phosphate.

Abstract: A method of synthesis of a metal fluorophosphate having the following general formula (1): XaMb(PO4)cFd (1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0?a?5; 0.5?b?3; 0.5?c?3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.

Abstract: A method of synthesis of a metal fluorophosphate having the following general formula (1): XaMb(PO4)cFd (1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0?a?5; 0.5?b?3; 0.5?c?3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.