Patents by Inventor Andre Hamwi

Andre Hamwi 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).

  • Patent number: 9705133
    Abstract: The invention relates to the use of subfluorinated carbon nano-objects as an electrode material of primary lithium batteries, the electrode obtained by that use and a lithium battery comprising such an electrode. The subfluorinated carbon nano-objects used in the invention have a central part made of nonfluorinated carbon and a peripheral part made of fluorinated carbon of formula CFX where x represents the F/C atomic ratio, which is such that 0.25<x<1.1 and whereof the spectrum 19F MAS RMN has a single peak between ?150 and ?190 ppm/CFCl3 (outside of rotation bands). The invention applies to the field of storing and retrieving energy, in particular.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: July 11, 2017
    Assignee: UNIVERSITE BLAISE PASCAL-CLERMONT-FERRAND II
    Inventors: Katia Guerin Araujo Da Silva, Marc Denis Alphonse Dubois, Andre Hamwi
  • Publication number: 20160072130
    Abstract: The invention relates to the use of subfluorinated carbon nano-objects as an electrode material of primary lithium batteries, the electrode obtained by that use and a lithium battery comprising such an electrode. The subfluorinated carbon nano-objects used in the invention have a central part made of nonfluorinated carbon and a peripheral part made of fluorinated carbon of formula CFx where x represents the F/C atomic ratio, which is such that 0.25<x<1.1 and whereof the spectrum 19F MAS RMN has a single peak between ?150 and ?190 ppm/CFCl3 (outside of rotation bands). The invention applies to the field of storing and retrieving energy, in particular.
    Type: Application
    Filed: December 11, 2013
    Publication date: March 10, 2016
    Inventors: Katia GUERIN ARAUJO DA SILVA, Marc Denis Alphonse DUBOIS, Andre HAMWI
  • Publication number: 20090258294
    Abstract: Subfluorinated graphite fluorides of formula CFx wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.
    Type: Application
    Filed: June 23, 2009
    Publication date: October 15, 2009
    Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Rachid YAZAMI, Andre HAMWI
  • Publication number: 20070231697
    Abstract: Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFx in which 0.63<x?0.95, 0.66<x?0.95 or 0.7<x?0.95. The subfluorinated carbonaceous materials are capable of electrochemical performance superior to commercial CF at relatively high rates of discharge.
    Type: Application
    Filed: February 21, 2007
    Publication date: October 4, 2007
    Inventors: Rachid Yazami, Andre Hamwi
  • Publication number: 20070231696
    Abstract: The invention provides fluorinated multi-layered carbon nanomaterials and methods for their production. In one aspect of the invention, the carbon nanomaterials are partially fluorinated and retain some unreacted carbon. The invention also provides electrodes and electrochemical devices incorporating the fluorinated carbon nanomaterials of the invention.
    Type: Application
    Filed: November 16, 2006
    Publication date: October 4, 2007
    Inventors: RACHID YAZAMI, ANDRE HAMWI
  • Publication number: 20070218364
    Abstract: The present invention provides electrochemical cells providing good electronic performance at low temperatures. Electrochemical cells of the present invention include lithium batteries capable of providing useful specific capacities under significant discharge rates for temperatures as low as ?60 degrees Celsius. The present invention also provides methods for making electrochemical cells including a room temperature predischarge step preceding low temperature operation that enhances the performance of batteries having subfluorinated carbonaceous positive electrode active materials at low temperatures.
    Type: Application
    Filed: February 15, 2007
    Publication date: September 20, 2007
    Inventors: Jay Whitacre, Rachid Yazami, Ratnakumar Bugga, Surya Prakash, Marshall Smart, William West, Andre Hamwi
  • Publication number: 20070077493
    Abstract: Subfluorinated graphite fluorides of formula CFx, wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.
    Type: Application
    Filed: October 18, 2005
    Publication date: April 5, 2007
    Applicant: California Institute of Technology
    Inventors: Rachid Yazami, Andre Hamwi
  • Publication number: 20070077495
    Abstract: Subfluorinated graphite fluorides of formula CFx wherein x is in the range of 0.06 to 0.63, e.g., 0.10 to 0.46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e.g., batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.
    Type: Application
    Filed: June 6, 2006
    Publication date: April 5, 2007
    Applicants: CALIFORNIA INSTITUTE OF TECHNOLOGY, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Rachid Yazami, Andre Hamwi
  • Patent number: 5175066
    Abstract: The present invention relates to a rechargeable battery with solid electrolyte.The battery according to the invention comprises a solid polymer electrolyte, an anode composed of a lithium source and a cathode comprising a lithium-receiving material. The lithium-receiving material is a compound of the formula CF.sub.x M.sub.y, where M is chosen from I, Cl, Br, Re, W, Mo, B and 0.3.ltoreq.x.ltoreq.0.9, 0.02.ltoreq.y.ltoreq.0.06, and the structure of this material is such that the carbon atoms form planar hexagons.The battery according to the invention has improved capacity.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: December 29, 1992
    Assignee: Centre National de la Recherche Scientifique (CNRS)
    Inventors: Andre Hamwi, Rachid Yazami