Patents by Inventor Dave Lessard

Dave Lessard 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).

  • Publication number: 20230411742
    Abstract: The present technology relates to laminates for lithium-ion batteries comprising at least one cathode layer; at least one anode layer; at least one electrolyte layer disposed between the at least one cathode layer and the at least one anode layer; and a viscosity modifier present on at least a portion of the laminate which limits the penetration of reactive fluids into the laminate and thereby controls the extent of oxidization of the anode, and prevents the formation of dendrites in said laminate. The present technology further relates to methods for preparing such laminates, and lithium-ion batteries comprising same.
    Type: Application
    Filed: June 8, 2023
    Publication date: December 21, 2023
    Inventors: Philippe PERRET, Michel PARENT, Dave LESSARD, Francois LAPIERRE, Frederic COTTON, Patrick LEBLANC
  • Patent number: 8420158
    Abstract: A process for making an electrode sheet for lithium electrochemical cells is disclosed. The process comprises the steps of: a) admixing a polyether polymer or copolymer soluble in water, at least one lithium salt, at least one electrochemically active material, water and an organic solvent miscible with water in a water/organic solvent ratio of a maximum of 50% organic solvent by volume to form a water-based solution/suspension containing by weight at least 20% active electrode material, at least 5% of a polyether polymer or copolymer, and at least 1.5% lithium salt; b) coating the water-based solution/suspension in the form of an electrode thin film onto an electrode support; and, c) drying the electrode thin film to obtain an electrode thin sheet having less than 1000 ppm of residual water.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: April 16, 2013
    Assignee: Bathium Canada Inc.
    Inventors: Patrick Leblanc, Frederic Cotton, Dave Lessard, Alain Vallee
  • Patent number: 8147916
    Abstract: A process for making an electrode sheet for a solid lithium electrochemical cells is disclosed. The process comprises the steps of: a) admixing a polyether polymer or copolymer, at least one lithium salt, at least one electrochemically active material and purified water to form an aqueous solution/suspension containing by weight at least 40% purified water, at least 20% active electrode material, up to 10% electrically conductive material, at least 5% polyether polymer or copolymer, and at least 1.5% lithium salt; b) coating the aqueous solution/suspension in the form of an electrode thin film onto an electrode support; and, c) evaporating the water from the electrode thin film to obtain an electrode sheet having less than 1000 ppm of residual water. The evaporation step is preferably carried out through a dryer/oven tunnel having incremental drying zones.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: April 3, 2012
    Assignee: Bathium Canada Inc.
    Inventors: Patrick Leblanc, Frederic Cotton, Dave Lessard, Alain Vallee
  • Publication number: 20090226636
    Abstract: A process for making an electrode sheet for lithium electrochemical cells is disclosed. The process comprises the steps of: a) admixing a polyether polymer or copolymer soluble in water, at least one lithium salt, at least one electrochemically active material, water and an organic solvent miscible with water in a water/organic solvent ratio of a maximum of 50% organic solvent by volume to form a water-based solution/suspension containing by weight at least 20% active electrode material, at least 5% of a polyether polymer or copolymer, and at least 1.5% lithium salt; b) coating the water-based solution/suspension in the form of an electrode thin film onto an electrode support; and, c) drying the electrode thin film to obtain an electrode thin sheet having less than 1000 ppm of residual water.
    Type: Application
    Filed: March 6, 2009
    Publication date: September 10, 2009
    Applicant: BATHIUM CANADA INC.
    Inventors: Patrick LEBLANC, Frederic COTTON, Dave LESSARD, Alain VALLEE
  • Publication number: 20090226635
    Abstract: A process for making an electrode sheet for a solid lithium electrochemical cells is disclosed. The process comprises the steps of: a) admixing a polyether polymer or copolymer, at least one lithium salt, at least one electrochemically active material and purified water to form an aqueous solution/suspension containing by weight at least 40% purified water, at least 20% active electrode material, up to 10% electrically conductive material, at least 5% polyether polymer or copolymer, and at least 1.5% lithium salt; b) coating the aqueous solution/suspension in the form of an electrode thin film onto an electrode support; and, c) evaporating the water from the electrode thin film to obtain an electrode sheet having less than 1000 ppm of residual water. The evaporation step is preferably carried out through a dryer/oven tunnel having incremental drying zones.
    Type: Application
    Filed: March 7, 2008
    Publication date: September 10, 2009
    Applicant: BATHIUM CANADA INC.
    Inventors: Patrick LEBLANC, Frederic COTTON, Dave LESSARD, Alain VALLEE
  • Patent number: 7272972
    Abstract: An apparatus for monitoring a thickness of a film in motion. The apparatus comprises a roller for receiving and supporting the film in motion, the roller being adapted to rotate about an axis of rotation. The apparatus also comprises a position detector for detecting when the roller is in a specific angular position as the roller rotates about the axis of rotation. The apparatus further comprises a measurement unit aligned with a specific portion of the roller and coupled to the position detector. The measurement unit is responsive to a detection of the roller being in the specific angular position to measure the thickness of the film.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: September 25, 2007
    Assignee: Avestor Limited Partnership
    Inventor: Dave Lessard
  • Publication number: 20060288771
    Abstract: An apparatus for monitoring a thickness of a film in motion. The apparatus comprises a roller for receiving and supporting the film in motion, the roller being adapted to rotate about an axis of rotation. The apparatus also comprises a position detector for detecting when the roller is in a specific angular position as the roller rotates about the axis of rotation. The apparatus further comprises a measurement unit aligned with a specific portion of the roller and coupled to the position detector. The measurement unit is responsive to a detection of the roller being in the specific angular position to measure the thickness of the film.
    Type: Application
    Filed: June 24, 2005
    Publication date: December 28, 2006
    Inventor: Dave Lessard