Patents by Inventor Roland J. Koestner
Roland J. Koestner 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: 11967721Abstract: A battery cathode includes: a current collector; and a coating applied to the current collector, the coating including: conductive carbon; polyvinylidene fluoride binder polymer; acid-functionalized dispersant polymer; and electrochemically active layered metal oxide.Type: GrantFiled: November 23, 2022Date of Patent: April 23, 2024Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Bradley R Frieberg, Mengyuan Chen, Roland J. Koestner, Xiaosong Huang
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Publication number: 20240030456Abstract: The present disclosure provides an electrode assembly for use in an electrochemical cell that cycles lithium ions. The electrode assembly includes a current collector, an electroactive material layer disposed parallel with the current collector, and a protective coating disposed between the current collector and the electroactive material layer. The electroactive material layer is defined by a plurality of electroactive material particles. At least a portion of the electroactive material particles of the plurality of electroactive material particles includes a protective particle coating. The protective particle coating is a carbon coating that includes a first carbonaceous material. The protective coating is a carbon layer that includes a second carbonaceous material.Type: ApplicationFiled: July 20, 2022Publication date: January 25, 2024Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Mengyuan CHEN, Xiaosong HUANG, Bradley R. FRIEBERG, Roland J. KOESTNER
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Patent number: 11799088Abstract: A cathode configured for use within a fuel cell system is provided. The cathode includes a cathode substrate. The cathode further includes a coating disposed upon the cathode substrate and including a fluorocarbon polymer additive configured for sintering at a temperature of less than 200° C. The fluorocarbon polymer additive may be mixed with a catalyst ink coating or may be applied separately as a topcoat layer.Type: GrantFiled: January 11, 2022Date of Patent: October 24, 2023Assignee: GM Global Technology Operations LLCInventors: Nagappan Ramaswamy, Roland J. Koestner, Swaminatha P. Kumaraguru
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Publication number: 20230246182Abstract: An electrode is provided that includes a high-nickel electroactive material having greater than or equal to about 0.6 mole fraction of nickel, and greater than or equal to about 0.1 wt. % to less than or equal to about 2 wt. % of a sulfonated aromatic ionomer additive. The electrode is prepared by contacting an electroactive material slurry with one or more surfaces of a current collector, where a solids portion of the slurry includes greater than or equal to about 45 wt. % to less than or equal to about 99 wt. % of a high-nickel electroactive material, and greater than or equal to about 0.1 wt. % to less than or equal to about 2 wt. % of a sulfonated aromatic ionomer additive.Type: ApplicationFiled: February 3, 2022Publication date: August 3, 2023Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Roland J. KOESTNER, Bradley R. FRIEBERG, Mengyuan CHEN
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Publication number: 20230223552Abstract: A cathode configured for use within a fuel cell system is provided. The cathode includes a cathode substrate. The cathode further includes a coating disposed upon the cathode substrate and including a fluorocarbon polymer additive configured for sintering at a temperature of less than 200° C. The fluorocarbon polymer additive may be mixed with a catalyst ink coating or may be applied separately as a topcoat layer.Type: ApplicationFiled: January 11, 2022Publication date: July 13, 2023Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Nagappan Ramaswamy, Roland J. Koestner, Swaminatha P. Kumaraguru
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Publication number: 20230093081Abstract: A positive electrode including positive electrode active material particles, a polymeric binder, a polymeric dispersant, and a combination of electrically conductive carbon additive types. The combination of electrically conductive carbon additive types includes carbon particles, graphene sheet stacks, and carbon nanotubes.Type: ApplicationFiled: September 16, 2021Publication date: March 23, 2023Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Bradley R. Frieberg, Xiaosong Huang, Nicole Ellison, Roland J. Koestner
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Publication number: 20220238885Abstract: An electrode conductive filler precursor dispersion is provided that includes a conductive carbon-based particle selected from the group consisting of: graphene nanoplatelet (GNP), carbon nanofibers (CNF), carbon nanotubes (CNT), and combinations thereof. A stabilizing polymer comprising polyvinyl-4-pyridine (PVPy). The dispersion also includes a solvent. The electrode conductive filler precursor dispersion is substantially free of syneresis for greater than or equal to about 7 days. Methods of making the electrode conductive filler precursor dispersion and electrodes from the electrode conductive filler precursor dispersion are also provided.Type: ApplicationFiled: January 27, 2021Publication date: July 28, 2022Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Roland J. KOESTNER, Anita LUONG, Xiaosong HUANG
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Patent number: 11302926Abstract: Systems, methods, fuel cells, and mixtures to inhibit ionomer permeation into porous substrates using a crosslinked ionomer are described. A method includes preparing an ionomer premix, mixing a crosslinking additive with the ionomer premix to thereby form a crosslinked-ionomer solution, and adding catalyst particles to the crosslinked-ionomer solution to produce a catalyst ink. The ionomer premix includes an ionomer dispersed within a solvent. The catalyst ink includes the catalyst particles distributed homogenously therethrough. The catalyst ink may be cast onto a porous substrate and dried to thereby form a catalyst layer for use in a fuel cell.Type: GrantFiled: August 27, 2019Date of Patent: April 12, 2022Assignee: GM Global Technology Operations LLCInventors: Nagappan Ramaswamy, Roland J. Koestner, Swaminatha P. Kumaraguru
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Publication number: 20210066726Abstract: Systems, methods, fuel cells, and mixtures to inhibit ionomer permeation into porous substrates using a crosslinked ionomer are described. A method includes preparing an ionomer premix, mixing a crosslinking additive with the ionomer premix to thereby form a crosslinked-ionomer solution, and adding catalyst particles to the crosslinked-ionomer solution to produce a catalyst ink. The ionomer premix includes an ionomer dispersed within a solvent. The catalyst ink includes the catalyst particles distributed homogenously therethrough. The catalyst ink may be cast onto a porous substrate and dried to thereby form a catalyst layer for use in a fuel cell.Type: ApplicationFiled: August 27, 2019Publication date: March 4, 2021Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Nagappan Ramaswamy, Roland J. Koestner, Swaminatha P. Kumaraguru
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Patent number: 10381653Abstract: An electrode ink composition that forms a fuel cell catalyst layer with reduced mudcracking is provided. The ink composition includes a solvent, a platinum group metal-containing catalyst composition dispersed in the solvent, a primary polymer dispersed within the solvent, the primary polymer being an ionomer, and a secondary polymer dispersed within the solvent, the secondary polymer interacting with the primary polymer via a non-covalent interaction.Type: GrantFiled: March 2, 2017Date of Patent: August 13, 2019Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Roland J. Koestner, Swaminatha P. Kumaraguru, Irina A. Kozhinova
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Publication number: 20190058204Abstract: A membrane-electrode assembly (MEA) for use in electrical applications, for example in polymer electrolyte fuel cells (PEFCs), includes a protective high-stiffness interlayer coating interposed between a gas diffusion layer and an ion conducting membrane layer, and includes also a catalyst layer. The interlayer mitigates electrical shorting across the ion conducting membrane layer, for example by providing mechanical support against fiber protrusions from the gas diffusion layers into the ion conducting membrane layer or by smoothing the roughness of the gas diffusion layer. The interlayer is typically a mixture of carbon black and one or more ionomers, and its properties are controlled by modulating its thickness, mechanical modulus, ionomer loading, and electrical conductivity.Type: ApplicationFiled: August 17, 2017Publication date: February 21, 2019Inventors: YEH-HUNG LAI, ROLAND J. KOESTNER, SRIKANTH ARISETTY, MEHUL M. VORA
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Publication number: 20180254489Abstract: An electrode ink composition that forms a fuel cell catalyst layer with reduced mudcracking is provided. The ink composition includes a solvent, a platinum group metal-containing catalyst composition dispersed in the solvent, a primary polymer dispersed within the solvent, the primary polymer being an ionomer, and a secondary polymer dispersed within the solvent, the secondary polymer interacting with the primary polymer via a non-covalent interaction.Type: ApplicationFiled: March 2, 2017Publication date: September 6, 2018Inventors: ROLAND J. KOESTNER, SWAMINATHA P. KUMARAGURU, IRINA A. KOZHINOVA
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Publication number: 20160064741Abstract: A method of making a membrane electrode assembly for a fuel cell, a membrane electrode assembly, a fuel cell and a fuel cell system. The method includes preferentially adsorbing an ionomer and electrocatalyst mixture onto the surface of a porous fuel cell substrate by appropriate treatment of the mixture prior to or contemporaneous with placement of the mixture onto the substrate. This promotes retention of the ionomer-coated electrocatalyst at or near the surface of the substrate where catalytic activity between it and a proton exchange membrane is designed to take place. Retention of the ionomer-coated electrocatalyst near these interfacial regions by the present invention is preferable to having the ionomer and electrocatalyst be significantly absorbed into the substrate.Type: ApplicationFiled: September 2, 2014Publication date: March 3, 2016Inventors: Swaminatha P. Kumaraguru, Roland J. Koestner, Irina Kozhinova
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Publication number: 20130096215Abstract: An ink composition for forming fuel cell electrodes includes a solvent system, an ion-conducting polymer dispersed within the solvent system, a supported catalyst dispersed within the solvent system; and an onium compound having a hydrophobic hydrocarbon moiety. The onium compound is substantially soluble in the solvent system.Type: ApplicationFiled: October 18, 2011Publication date: April 18, 2013Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLCInventors: Roland J. Koestner, Heidi M. Viterise, Irina Kozhinova
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Patent number: 8252712Abstract: An ink composition for forming a fuel cell electrode includes a catalyst composition, a polymeric binder, a polymeric dispersant, and a solvent. The polymeric dispersant includes a perfluorocyclobutyl-containing polymer.Type: GrantFiled: November 13, 2009Date of Patent: August 28, 2012Assignee: GM Global Technology Operations LLCInventors: Roland J. Koestner, Sean M Mackinnon, Timothy J. Fuller, Jeanette E. Owejan
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Publication number: 20110117472Abstract: An ink composition for forming a fuel cell electrode includes a catalyst composition, a polymeric binder, a polymeric dispersant, and a solvent. The polymeric dispersant includes a perfluorocyclobutyl-containing polymer.Type: ApplicationFiled: November 13, 2009Publication date: May 19, 2011Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.Inventors: Roland J. Koestner, Sean M Mackinnon, Timothy J. Fuller, Jeanette E. Owejan
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Patent number: 7597956Abstract: A method of fabricating a polymeric film includes adsorbing an ammonium salt surfactant over a plurality of polymer beads. The method also includes adding the polymer beads to a polymer solution, wherein the ammonium salt surfactant substantially prevents flocculation of the polymer beads. Additionally, a polymeric film includes a plurality of polymer beads each having an outer surface. The polymeric film also includes an ammonium salt surfactant disposed over each of the outer surfaces, wherein the ammonium salt surfactant substantially prevents flocculation of the polymer beads.Type: GrantFiled: January 28, 2005Date of Patent: October 6, 2009Assignee: Eastman Kodak CompanyInventors: Roland J. Koestner, Craig T. Mollon, Timothy C. Schunk, William J. Gamble
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Patent number: 7173065Abstract: Backside conductive layers with increased conductive efficiency can be provided for thermally developable materials by formulating hydrophilic metal oxide clusters in a hydrophobic environment using low shear mixing conditions. The dry thickness and coating weight of the conductive layer are thereby reduced.Type: GrantFiled: March 24, 2006Date of Patent: February 6, 2007Assignee: Eastman Kodak CompanyInventors: Thomas J. Ludemann, Gary E. LaBelle, Roland J. Koestner, Samuel Chen
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Patent number: 7153636Abstract: Thermally developable materials including photothermographic and thermographic materials have an outermost backside layer that includes a combination of a polysiloxane and a smectite clay that has been modified with a quaternary ammonium compound. The resulting outermost backside layers exhibit improved abrasion resistance. The materials can also include conductive layers underneath the outermost backside layer.Type: GrantFiled: August 1, 2005Date of Patent: December 26, 2006Assignee: Eastman Kodak CompanyInventors: Thomas J. Ludemann, Gary E. LaBelle, Roland J. Koestner, Thomas J. Kub, Karissa L. Eckert
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Patent number: 7144689Abstract: The use of metal antimonates at high metal antimonate to binder ratios in buried backside conductive layers of thermographic and photothermographic materials allows the use of thin backside overcoat layers. The combination provides antistatic constructions having excellent antistatic properties that show less change in resistivity with changes in humidity. The thin backside overcoat layer serves to protect the buried antistatic layer.Type: GrantFiled: May 9, 2006Date of Patent: December 5, 2006Assignee: Eastman Kodak CompanyInventors: Thomas J. Ludemann, Gary E. LaBelle, Darlene F. Philip, Roland J. Koestner, Aparna V. Bhave