Patents by Inventor Patrick Willmann

Patrick Willmann 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: 8062561
    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.
    Type: Grant
    Filed: July 28, 2005
    Date of Patent: November 22, 2011
    Assignees: Centre National d'Etudes Spatiales, Central National de la Recherche Scientifique, Universite de Montpellier II
    Inventors: Jean-Claude Jumas, Pierre-Emmanuel Lippens, Josette Olivier-Fourcade, Florent Robert, Patrick Willmann
  • Publication number: 20080003502
    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.
    Type: Application
    Filed: July 28, 2005
    Publication date: January 3, 2008
    Inventors: Jean-Claude Jumas, Pierre-Emmanuel Lippens, Josette Olivier-Fourcade, Florent Robert, Patrick Willmann
  • Patent number: 6489063
    Abstract: The invention relates to additives to improve the reversibility of a carbon electrode of a lithium ion secondary electrochemical generator. These additives are composed of cyclic or non-cyclic &agr;-halogenated esters such as &agr;-bromo-&ggr;-butyrolactone or methyl chloroformiate. They may be added to the electrolyte at a rate of 0.5 to 3% by volume or adsorbed on the carbon electrode to form a passivation film on said electrode during the first use of the generator.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: December 3, 2002
    Assignee: Centre National d'Etudes Spatiales
    Inventors: Denis Billaud, Abdelaziz Naji, Patrick Willmann
  • Patent number: 6403260
    Abstract: The invention relates to a lithium-rich carbonaceous substance which can be used as a negative electrode in a lithium accumulator. This substance has the following formula: LiNaxCyOz  (I) in which x, y and z are such that 0.4≦x≦0.6 2.5≦y≦3.5 0.2≦z≦1 It can be prepared by the insertion of lithium electrochemically in a graphite-sodium-oxygen compound.
    Type: Grant
    Filed: May 8, 2000
    Date of Patent: June 11, 2002
    Assignee: Centre National d'Etudes Spatiales
    Inventors: Patrick Willmann, Denis Billaud, Laurent Thevenot
  • Patent number: 5993767
    Abstract: The invention relates to a lithium hexafluorophosphate solvate usable for the preparation of high purity lithium hexafluorophosphate.This solvate of lithium hexafluorophosphate and pyridine complies with the formula:Li(C.sub.5 H.sub.5 N)PF.sub.6and is prepared by a process comprising the following stages:a) preparation of pyridinium hexafluorophosphate of formula C.sub.5 H.sub.5 NHPF.sub.6 by the neutralization of hexafluorophosphoric acid HPF.sub.6 with pyridine andb) conversion of the pyridinium hexafluorophosphate into solvate LiPF.sub.6, C.sub.5 H.sub.5 N by exchange with a lithium compound chosen from among lithium hydroxide, lithium alkoxides and alkyl-lithiums.The LiPF.sub.6 can be regenerated from the solvate by vacuum decomposition.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: November 30, 1999
    Assignee: Centre National D'Etudes Spatiales
    Inventors: Patrick Willmann, Regine Naejus, Robert Coudert, Daniel Lemordant
  • Patent number: 5731107
    Abstract: The invention relates to a polyacetylene-lithium insertion compound, its use in a storage battery and a process for the preparation of polymer-lithium insertion compounds.This insertion compound contains at least six CH groups per lithium atom and has a monoclinic structure. Polymer-lithium compounds can be obtained by the compression of a polymer mixture, such as polyacetylene, and lithium, e.g. under 30 to 250 MPa and at ambient temperature.The compound can be used as a negative electrode (5) in a lithium storage battery having an oxide, sulphide or oxysulphide positive electrode (9) and a lithium ion-conducting electrolyte (8).
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 24, 1998
    Assignee: Centre National d'Etudes Spatiales
    Inventors: Patrick Willmann, Denis Billaud, Fran.cedilla.ois Xavier Henry
  • Patent number: 5453337
    Abstract: The use of vanadium oxide iron and/or aluminium bronzes as a cathode material in electrochemical generators is described. The cathode material is a vanadium oxide bronze having formula: M.sup.1.sub.x1 M.sup.2.sub.x2 V.sub.2 O.sub.5, wherein M.sup.1 is a vanadium oxide bronze or iron, M.sup.2 is a metal different from M.sup.1 having valency n and chosen from alkali metals, alkaline earth metals, transition metals and aluminium, and x.sub.1 and x.sub.2 are such that 0.06.ltoreq.x.sub.1 .ltoreq.0.13; 0.ltoreq.x.sub.2 .ltoreq.0.20; and 0.27.ltoreq.3x.sub.1 .ltoreq.nx.sub.2 .ltoreq.0.39; and may be combined as a cathode (9) with an Li or Li alloy anode (5) and with an electrolyte consisting of lithium perchlorate in propylene carbonate.
    Type: Grant
    Filed: July 5, 1994
    Date of Patent: September 26, 1995
    Assignee: Centre National d'Etudes Spatiales
    Inventors: Patrick Willmann, Jean-Pierre Pereira-Ramos, Rita Baddour-Hadjean, Noel Baffier