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: The invention concerns a catalyst comprising at least one metal M from group VIII, tin, a phosphorus promoter, a halogenated compound, a porous support and at least one promoter X1 selected from the group constituted by gallium, indium, thallium, arsenic, antimony and bismuth. In 119Sn Mössbauer spectroscopy, the catalyst in the reduced form has a signal with a quadripole splitting value in the range 0 to 0.45 mm/s and an isomer shift, IS, in the range 1.5 to 2.4 mm/s with respect to CaSnO3, said signal representing in the range 1% to 30% of the total area of the signals.

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 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?c?10; b is such that 1?b?4; and a=(2c?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.

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: An active material for high-voltage negative electrodes (>1V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3?WFeXMyM?ZO7??, where M and M? are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, ? is related to the formal oxidation numbers n and n? of M and M? by the relation 2?=v+4w?3x?ny?n?z and the ranges of values are ?0.5?V?0.5, 0?w?0.2, x>0, y+z>0 and x+y+z?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? 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.

Abstract: This invention relates to a negative electrode material, a method for producing this material, and to a negative electrode and a lithium-ion battery comprising this material. The material of the invention 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?c?10; b is such that 1?b?4; and a=(2c?bm)/d. An interface of mixed composition exists between the XaYbOc material and the active phase M, the said interface consisting of the elements M, X, Y and O. XaYbOc may be for example BPO4.

Abstract: An active material for high-voltage negative electrodes (>1 V vs. Li) of secondary rechargeable lithium batteries is disclosed. Chemical composition is represented by the general formula Li2+vTi3?WFeXMyM?ZO7??, where M and M? are metal ions having an ionic radius between 0.5 and 0.8 A and forming an octahedral structure with oxygen, like Ti3+, Co2+, Co3+, Ni2+, Ni3+, Cu2+, Mg2+, Al3+, In3+, Sn4+, Sb3+, Sb5+, ? is related to the formal oxidation numbers n and n? of M and M? by the relation 2?=v+4w ?3x?ny?n?z and the ranges of values are ?0.5?V?0.5, 0?w?0.2, x>0, y+z>0 and x+y+z?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? 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.