Abstract: The present invention relates to an electrode comprising a current collector formed by a metal strip which is coated on at least one of the faces thereof with a composition of electrochemically active materials, the composition comprising at least one lithium manganese iron phosphate having the following formula: LixMn1-y-zFeyMzPO4, where M is selected from the group consisting of B, Mg, Al, Si, Ca, Ti, V, Cr, Co, Ni, Cu, Zn, Y, Zr, Nb and Mo, alone or in a mixture, with 0.8?x?1.2; 0.5?1-y-z<1; 0.05?y?0.5 and 0?z?0.2; the current collector having undergone chemical pickling of at least one of the faces thereof.

Abstract: The use of a blend of a lithium nickel oxide and a lithium manganese iron phosphate as an active material composition in the cathode of a lithium secondary electrochemical cell for automotive applications, such as hybrid and electric vehicles. This blend allows decreasing the porosity of a lithium manganese iron phosphate-based cathode. It also allows improving the detectability of a gas release in the cell in case of an abnormal operation of the cell. It allows lowering the cell impedance at a low state of charge, typically less than 30%, and reducing the impedance increase of the cell during the cell lifespan.

Abstract: A metal foil including on at least one of its sides a layer of a material including: a metal or a metal alloy, carbon, hydrogen, and optionally oxygen, the atomic percentage of the metal or of the metals of the alloy in the material ranging from 10 to 60%, the atomic percentage of carbon in the material ranging from 35 to 70%, the atomic percentage of hydrogen in the material ranging from 2 to 20%, and the atomic percentage of oxygen if present in the material being less than or equal to 10%. The metal foil can be used in the manufacture of a cathode of a lithium-ion electrochemical cell. The deposition of this layer reduces the internal resistance of the cell.

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 metal foil including on at least one of its sides a layer of a material including: a metal or a metal alloy, carbon, hydrogen, and optionally oxygen, the atomic percentage of the metal or of the metals of the alloy in the material ranging from 10 to 60%, the atomic percentage of carbon in the material ranging from 35 to 70%, the atomic percentage of hydrogen in the material ranging from 2 to 20%, and the atomic percentage of oxygen if present in the material being less than or equal to 10%. The metal foil can be used in the manufacture of a cathode of a lithium-ion electrochemical cell. The deposition of this layer reduces the internal resistance of the cell.

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 Low Earth Orbit (LEO) satellite has 95 to 105 minutes orbit time with only 60-65 minutes available for recharging. Due to the low charge capability of a Li-ion graphite cell, depth of discharge is limited for this application. The cell of the invention using a lithiated titanate oxide or a titanate oxide able to be lithiated in the negative electrode allows increase of depth of discharge. Increasing charge rate without amplifying capacity loss per cycle allows improvement of useful specific energy per cycle. Depth of discharge values up to 70-80% can be envisioned. Even if the cell exhibits low specific energy, the LEO application is a specific case where useful energy per cycle can be optimized to 70 to 80 Wh/kg.

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 composition including (a) a lithiated oxide of transition metals containing at least nickel, cobalt and aluminum and (b) a lithiated phosphate of at least one transition metal, the surface of which is at least partially covered by a layer of carbon. In the composition, the proportion by mass of the lithiated oxide of transition metals containing at least nickel, cobalt and aluminum is less than or equal to 10% of the weight of the composition, and the proportion by mass of the lithiated phosphate of at least one transition metal is greater than or equal to 90% of the weight of the composition. A lithium-ion or lithium-polymer type accumulator including at least one positive electrode containing this composition.

Abstract: A safety current interrupter device for a rechargeable cell is provided comprising a deformable material (2) adapted to deform when the temperature reaches a threshold value, a deformable membrane (3) adapted to deform under the effect of pressure and/or deformation of the deformable material (2), and an electrically conductive link member (4), adapted to break as a result of the deformation of the deformable membrane (3).

Abstract: The invention relates to active material for the negative electrode of secondary rechargeable lithium batteries, wherein the active material is based on doped or undoped carbon-bearing lithium titanium ramsdellite oxide with general formula Li2Ti3O7 or Li2.28Ti3.43O8. The active material comprises a carbon substituted ramsdellite phase having a general formula Li2?4cCc—Ti3O7, with 0.1<c<0.5, and more than 0.1 mol % of spinel phase having a general formula Li1+xTi2?xO4 with 0<x<0.33.

Abstract: An active material for a lithium battery electrode comprises a phase having the formula Li2+v?4cCcTi3?wFexMyM?zO7??, in which M and M? are metal ions of groups of 2 to 15 having an ionic radius between 0.5 and 0.8 ? in an octahedral environment, v, w, x, y, z and ? being associated by the relationships: 2?=?v+4w?3x?ny?n?z, with n and n? being the respective formal degrees of oxidation of M and M?; ?0.5?v?0.5; y+z>0; x+y+z=w; and 0<w?0.3; and wherein at least part of the lithium is substituted by carbon according to the relationship 0<c(2+v)/4. The invention also includes a method for synthesizing the active material which comprises mixing and grinding the precursor compounds containing the metal components, carbon and oxygen; heating the mixture in an inert atmosphere at a temperature of 950 to 1050° C. in order to make a ceramic phase; and rapidly cooling the ceramic phase to produce the active material.

Abstract: An electrode material comprising a LixFeyMzPw04 compound for an electrode for a Li rechargeable battery, wherein 0.90<=x<=1.03, 0.85<=y<=1.0, 0.01<=z<=0.15, 0.90<=w<=1.0, 1.9<=x+y+z<=2.1; wherein M comprises at least one element selected from the group consisting of Mn, Co, Mg, Cr, Zn, Al, Ti, Zr, Nb, Na, and Ni; and wherein the compound comprises a charge transfer resistance increase of less than 20% between room temperature and 0° C.

Abstract: The invention relates to active material for the negative electrode of secondary rechargeable lithium batteries, wherein the active material is based on doped or undoped carbon-bearing lithium titanium ramsdellite oxide with general formula Li2Ti3O7 or Li2.28Ti3.43O8. The active material comprises a carbon substituted ramsdellite phase having a general formula Li2?4cCc—Ti3O7, with 0.1<c<0.5, and more than 0.1 mol % of spinel phase having a general formula Li1+xTi2?xO4 with 0<x<0.33.

Abstract: A safety current interrupter device for a rechargeable cell is provided comprising a deformable material (2) adapted to deform when the temperature reaches a threshold value, a deformable membrane (3) adapted to deform under the effect of pressure and/or deformation of the deformable material (2), and an electrically conductive link member (4), adapted to break as a result of the deformation of the deformable membrane (3).

Abstract: The present invention relates to lithium cells, accumulators and batteries, and more particularly an active material for the negative electrode of rechargeable batteries. It concerns more particularly a material comprising a phase having a general formula Li2+v?4cCcTi3-wFexMyM?zO7?, in which M and M? are metal ions of groups of 2 to 15 having an ionic radius between 0.5 and 0.8 ? in an octahedral oxygen environment, v, w, x, y, z and ? being associated by the relationships: 2?=?v+4w?3x-ny-n?z, with n and n? the respective formal degrees of oxidation of M and M?; ?0.5?v?+0.5; y+z>0; x+y+z=w; and 0<w?0.3; characterized in that at least part of the lithium is substituted by carbon according to the relationship 0<c?(2+v)/4. The material has improved mass and volume capacities that may reach 190 Ah/kg, while preserving the previously acquired advantages, notably: a small loss of capacity at the first cycle, of 2 to 10 Ah/kg; excellent cyclability; low polarization of 30 to 70 mV in C/15 régime.

Abstract: A composition comprising: a) a lithiated oxide of transition metals containing at least nickel, cobalt and aluminium; b) a lithiated phosphate of at least one transition metal, the surface of which is at least partially covered by a layer of carbon, the proportion by mass of the lithiated oxide of transition metals containing at least nickel, cobalt and aluminium, being less than or equal to 10 % of the weight of the composition. the proportion by mass of the lithiated phosphate of at least one transition metal being greater than or equal to 90 % of the weight of the composition. A lithium-ion or lithium-polymer type accumulator comprising at least one positive electrode containing this composition.