Saft Groupe Sa

Centre National De La Recherche Scientifique

Universitè De Montpellier

Umicore

Saft

H.e.f.

Saft Group Sa

Universite De Montpellier II

Cécile Tessier

Michèle Van Thournout

Josette Olivier-Fourcade

Laure Monconduit

Claire Villevieille

Philippe Biensan

Jean-Claude Jumas

Laurent Dubost

Jean-Paul Peres

Philippe Borel

Stéphane Levasseur

Florent Fischer

Julien Breger

Erwan Dumont

Kamen Nechev

Bridget Deveney

Olivier Jan

Costana Ionica-Bousquet

Frédéric Castaing

Celine Lavaud

Michel Joseph Pierre Marie Martin

Michel Ulldemolins

Yannick Borthomieu

Thomas Greszler

Chengsong Ma

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.

Metal foil for electrochemical element electrode comprising a material, based on ti, c and h

A composition of active material for a positive electrode of a lithium-ion electrochemical cell is provided comprising: (a) a lithiated oxide of formula LiMOin which: 0&#x2264;x&#x2264;0.15, M designates NiMnCoM'where a&#x3e;0; b&#x3e;0; c&#x3e;0; d&#x2265;0 and a+b+c+d=1; M&#x2032; 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 LiMnM&#x2033;POwhere M&#x2033; represents at least one element chosen from the group consisting of Fe, Ni, Co, Mg and Zn; and 0&#x3c;y&#x3c;0.5; the particle size distribution of the lithiated oxide being characterized by a first volume median diameter of the particles Dv&#x2265;500 nm; the particle size distribution of the lithiated phosphate being characterized by a second volume median diameter of the particles Dv&#x2265;500 nm; and Dv/Dv&#x2265;1.5.

Positive electrode for a lithium electrochemical cell

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.

Positive electrode material for lithium-ion accumulator

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

Thermo-mechanically activated current interrupter

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 LiTiOor LiTiO. The active material comprises a carbon substituted ramsdellite phase having a general formula LC&#x2014;TiO, with 0.1&#x3c;c&#x3c;0.5, and more than 0.1 mol % of spinel phase having a general formula Li+xTiOwith 0&#x3c;x&#x3c;0.33.

High voltage negative active material for a rechargeable lithium battery

An active material for a lithium battery electrode comprises a phase having the formula LiCTiFeMM'O, in which M and M&#x2032; are metal ions of groups oftohaving an ionic radius betweenand&#x212b; in an octahedral environment, v, w, x, y, z and &#x3b1; being associated by the relationships:&#x3b1;=&#x2212;v+w&#x2212;x&#x2212;ny&#x2212;n&#x2032;z, with n and n&#x2032; being the respective formal degrees of oxidation of M and M&#x2032;; &#x2212;&#x2266;v&#x2266;; y+z&#x3e;; x+y+z=w; and&#x3c;w&#x2266;; and wherein at least part of the lithium is substituted by carbon according to the relationship&#x3c;c(+v)/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 ofto&#xb0; C. in order to make a ceramic phase; and rapidly cooling the ceramic phase to produce the active material.

Negative electrode material for Li-ion batteries

Growing community of inventors

Bruges, France

Cécile Tessier