Universitè De Montpellier

Centre National De La Recherche Scientifique

Umicore

Institut Francais Du Pe'trole

Saft Groupe Sa

Centre National Detudes Spatiales

Ifp Energies Nouvelles

Saft

Universite De Montpellier II

Josette Olivier-Fourcade

Blaise Didillon

Fabienne Le Peltier

Priscilla Avenier

Jean-Claude Jumas

Michèle Van Thournout

Cécile Tessier

Laure Monconduit

Claire Villevieille

Pierre-Emmanuel Lippens

Patrick Willmann

Stéphane Levasseur

Florent Fischer

Fermin Cuevas

Florent Robert

Pierre Kubiak

Aurélie Picard

Laurent Aldon

Costana Ionica-Bousquet

Alix Ladam

Nicolas Bibent

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

A negative electrode material, a method for producing this material, and to a negative electrode and a lithium-ion battery comprising this material are described. The material comprises an active phase consisting of a material M based on Al, Si, Sn, Sb or a mixture thereof, and a support phase consisting of a material XaYbOc, where: O is an oxygen; Y is a cation with oxidation degree m=3, 4, 5 or 6; X is a cation with oxidation degree d=1, 2, 3, 4 or 5, X ensuring the electroneutrality of XaYbOc; and where: c is such that 2&#x2266;c&#x2266;10; b is such that 1&#x2266;b&#x2266;4; and a=(2c&#x2212;bm)/d. An interface of mixed composition exists between the XaYbOc material and the active phase M, the interface consisting of the elements M, X, Y and O.

Negative electrode composite material, production method, negative electrode and lithium-ion battery

An active material for high-voltage negative electrodes (&#x3e;1V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula LiTiFeMM'O, where M and M&#x2032; are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti, Co, Co, Ni, Ni, Cu, Mg, A, In, Sn, Sb, Sb, &#x3b1; is related to the formal oxidation numbers n and n&#x2032; of M and M&#x2032; by the relation 2&#x3b1;=v+4w&#x2212;3x&#x2212;ny&#x2212;n&#x2032;z and the ranges of values are &#x2212;0.5&#x2266;V&#x2266;0.5, 0&#x2266;w&#x2266;0.2, x&#x3e;0, y+z&#x3e;0 and x+y+z&#x2266;0.7. The structure is related to that of ramsdellite for all the compositions. The negative active material is prepared by ceramics process wherein lithium oxide, titanium oxide, iron oxide, M and/or M&#x2032; oxide are used as starting material for synthesis. Inorganic or organic solid precursors of the oxides can also be used instead. After reactant dispersion the mixture is fired. The resulting electrochemically active material provides low working voltage and capacity with excellent cycling capabilities at both low and high current densities.

Negative electrode for lithium batteries

A novel supported bimetallic catalyst comprises a group VIII metal such as platinum, and tin, at least a portion of which interacts strongly with the group VIII metal in the catalyst in the reduced state. In the partially oxidized state, the catalyst of the invention contains at least 10% of tin in the form of a reduced tin species with oxidation state 0, said species having an isomer shift in the range 0.80 to 2.60 mm/s and a quadrupolar splitting in the range 0.65 to 2.00 mm/s. The invention also concerns the preparation of said catalyst, and processes using said catalyst for transforming hydrocarbons into aromatic compounds, such as gasoline reforming processes and aromatic production processes.

Supported bimetallic catalyst with a strong interaction between a group VIII metal and tin, and its use in a catalytic reforming process

A process for dehydrogenating organic compounds, in particular paraffins and naphthenes, is carried out in the presence of a supported catalyst comprising a group VIII metal such as platinum, and tin, at least a portion of which interacts strongly with the group VIII metal in the catalyst in the reduced state. In the partially oxidised state, the catalyst contains at least 10% of tin in the form of a reduced tin species with oxidation state 0, said species having an isomer shift in the range 0.80 to 2.60 mm/s and a quadrupolar splitting in the range 0.65 to 2.00 mm/s.

Process for dehydrogenating organic compounds in the presence of a supported bimetallic catalyst with a strong interaction between a group VIII metal and tin

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Josette Olivier-Fourcade