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US 7,457,018 B2Granted
Synthesis method for carbon material based on LiMPO4
AssigneeHydro-Quebec
InventorsMichel Armand, Michel Gauthier, Jean-Francois Magnan, Nathalie Ravet
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AssigneeHydro-Quebec
InventorsMichel Armand, Michel Gauthier, Jean-Francois Magnan, Nathalie Ravet
Estimating the term…
Method of synthesis for a material made of particles having a core and a coating and/or being connected to each other by carbon cross-linking, the core of these particles containing at least one compound of formula LixM1-yM′y(XO4)n, in which x, y and n are numbers such as 0≦x≦2, 0≦y≦0.6 and 1≦n≦1.5, M is a transition metal, M′ is an element with fixed valency, and the synthesis is carried out by reaction and bringing into equilibrium the mixture of precursors, with a reducing gaseous atmosphere, in such a way as to bring the transition metal or metals to the desired valency level, the synthesis being carried out in the presence of a source of carbon called carbon conductor, which is subjected to pyrolysis. The materials obtained have excellent electrical conductivity, as well as very improved chemical activity.
A material comprising particles, the particles comprising a core and a carbon deposit on the core, wherein the core comprises at least one compound of the formula LixM1-yM′y(XO4)n, wherein x, y and n are numbers such that 0≦x≦2, 0≦y≦0.6, and 1≦n≦1.5, M is a transition metal or a mixture of transition metals from the first period of the periodic table, M′ is an element with fixed valency selected from the group consisting of Mg2+, Ca2+, Al3+, and Zn2+, X is S, P or Si, and wherein the conductivity of the material is greater than 10−8 S.cm−1, measured on a sample of powder compressed at a pressure greater than or equal to 3000 Kg.cm−2.
A material comprising particles, the particles comprising a core, wherein the particles comprise a cross-linking of carbon among the particles, wherein the core comprises at least one compound of the formula LixM1-yM′y(XO4)n, wherein x, y and n are numbers such that 0≦x≦2, 0≦y≦0.6, and 1≦n≦1.5, M is a transition metal or a mixture of transition metals from the first period of the periodic table, M′ is an element with fixed valency selected from the group consisting of Mg2+, Ca2+, Al3+, and Zn2+, X is S, P or Si, and wherein the conductivity of the material is greater than 10−8 S.cm−1, measured on a sample of powder compressed at a pressure greater than or equal to 3000 kg.cm−2.
Dependencies are inferred from the claim text.