Patents by Inventor Sylvain Gwizdala
Sylvain Gwizdala has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8236453Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4, phase, coated with conductive carbon.Type: GrantFiled: March 8, 2011Date of Patent: August 7, 2012Assignees: Umicore, Le Centre National de la Recherche ScientifiqueInventors: Albane Audemer, Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Publication number: 20110212365Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon.Type: ApplicationFiled: March 8, 2011Publication date: September 1, 2011Applicants: UMICORE, LE CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUEInventors: Albane AUDEMER, Calin WURM, Mathieu MORCRETTE, Sylvain GWIZDALA, Christian MASQUELIER
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Patent number: 7923154Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon.Type: GrantFiled: November 14, 2008Date of Patent: April 12, 2011Assignees: Umicore, Le Centre National de la Recherche ScientifiqueInventors: Albane Audemer, Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Patent number: 7670721Abstract: Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPO4 with controlled size and morphology, M being FexCoyNizMnw, where 0?x?1, 0?y?1, 0?w?1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePO4 including the steps of providing an equimolar aqueous solution of Li1+, Fe3+ and PO43?, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500° C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800° C. in a reducing atmosphere to produce the LiFePO4 powder. The obtained powders can have a particle size of less than 1 ?m, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.Type: GrantFiled: April 11, 2007Date of Patent: March 2, 2010Assignees: Le Centre National de la Rocherche Scientifique, UmicoreInventors: Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Patent number: 7618747Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon.Type: GrantFiled: June 19, 2003Date of Patent: November 17, 2009Assignees: Umicore, Le Centre National de la Recherche ScientifiqueInventors: Albane Audemer, Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Publication number: 20090111024Abstract: Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPO4 with controlled size and morphology, M being FexCoyNizMnw, where 0?x?1, 0?y?1, 0?w?1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePO4 including the steps of providing an equimolar aqueous solution of Li1+, Fe3+ and PO43?, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500° C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800° C. in a reducing atmosphere to produce the LiFePO4 powder. The obtained powders can have a particle size of less than 1 ?m, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.Type: ApplicationFiled: April 11, 2007Publication date: April 30, 2009Applicants: Le Centre National de la Recherche Scientifique, UmicoreInventors: Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Publication number: 20090072203Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon.Type: ApplicationFiled: November 14, 2008Publication date: March 19, 2009Applicants: Umicore, Le Centre National de la Recherche ScientifiqueInventors: Albane AUDEMER, Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Patent number: 7371482Abstract: Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPO4 with controlled size and morphology, M being FexCoyNizMnw, where 0?x?1,0?y?1, 0?w?1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePO4 including the steps of providing an equimolar aqueous solution of Li1+, Fe3+ and PO43?, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500° C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800° C. in a reducing atmosphere to produce the LiFePO4 powder. The obtained powders can have a particle size of less than 1 ?m, and can provide superior electrochemical performance when mixed for an appropriate time with an electrically conductive powder.Type: GrantFiled: November 21, 2003Date of Patent: May 13, 2008Assignees: Le Centre National de la Recherche Scientifique, UmicoreInventors: Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier
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Publication number: 20060035150Abstract: The invention provides a new route for the synthesis of carbon-coated powders having the olivine or NASICON structure, which form promising classes of active products for the manufacture of rechargeable lithium batteries. Carbon-coating of the powder particles is necessary to achieve good performances because of the rather poor electronic conductivity of said structures. For the preparation of coated LiFePO4, sources of Li, Fe and phosphate are dissolved in an aqueous solution together with a polycarboxylic acid and a polyhydric alcohol. Upon water evaporation, polyesterification occurs while a mixed precipitate is formed containing Li, Fe and phosphate. The resin-encapsulated mixture is then heat treated at 700° C. in a reducing atmosphere. This results in the production of a fine powder consisting of an olivine LiFePO4 phase, coated with conductive carbon.Type: ApplicationFiled: June 19, 2003Publication date: February 16, 2006Inventors: Albane Audemer, Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christain Masquelier
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Publication number: 20040175614Abstract: Methods of manufacture and use of phosphates of transition metals are described as positive electrodes for secondary lithium batteries, including a process for the production of LiMPO4 with controlled size and morphology, M being FexCoyNizMnw, where 0≦x≦1,0≦y≦1, 0≦w≦1, and x+y+z+w=1. According to an exemplary embodiment, a process is described for the manufacture of LiFePO4 including the steps of providing an equimolar aqueous solution of Li1+, Fe3+ and PO43−, evaporating water from the solution to produce a solid mixture, decomposing the solid mixture at a temperature of below 500° C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800° C. in a reducing atmosphere to produce the LiFePO4 powder.Type: ApplicationFiled: November 21, 2003Publication date: September 9, 2004Inventors: Calin Wurm, Mathieu Morcrette, Sylvain Gwizdala, Christian Masquelier