Patents by Inventor Ivan Exnar
Ivan Exnar 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: 8357468Abstract: The present invention concerns a carbon coated lithium metal phosphate material containing a manganese oxide layer between the LiMnPO4 material or the C/LiMn1-x ZxPO4 material, where Z=Fe, Co, Ni, Mg, Ca, Al, Zr, V, Ti and x=0.01-0.3, and the carbon layer.Type: GrantFiled: July 3, 2008Date of Patent: January 22, 2013Assignee: Dow Global Technologies LLCInventors: Ivan Exnar, Thierry Drezen, Marketa Zukalova, James Miners, Otakar Frank, Ladislav Kavan
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Patent number: 8313863Abstract: Novel process for the preparation of finely divided, nano-structured, olivine lithium metal phosphates (LiMPO4) (where metal M is iron, cobalt, manganese, nickel, vanadium, copper, titanium and mix of them) materials have been developed. This so called Polyol” method consists of heating of suited precursor materials in a multivalent, high-boiling point multivalent alcohol like glycols with the general formula HO—(—C2H4O—), —H where n=1-10 or HO—(—C3H6O—)n—H where n=1-10, or other polyols with the general formula HOCH2—(—C3H5OH—)n—H where n=1-10, like for example the tridecane-1,4,7,10,13-pentaol. A novel method for implementing the resulting materials as cathode materials for Li.-ion batteries is also developed.Type: GrantFiled: April 6, 2006Date of Patent: November 20, 2012Assignee: Dow Global Technologies LLCInventors: Ivan Exnar, Thierry Drezen
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Patent number: 8133616Abstract: A process for the production of nano-structured olivine lithium manganese phosphate (LiMnPO4) electrode material comprising of the following steps: sol gel preparation in a chelating environment; preparation of lithium manganese phosphate/carbon composite by ball-milling; and electrode preparation.Type: GrantFiled: February 14, 2006Date of Patent: March 13, 2012Assignee: Dow Global Technologies LLCInventors: Ivan Exnar, Thierry Drezen, Nam Hee Kwon-Roth, Motoshi Isono
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Patent number: 8097361Abstract: This invention concerns a novel method for surface derivatization of electrode materials for Li-ion batteries. The derivatization is based on adsorption of a composite assembly consisting of amphiphilic redox active molecule attached to single walled carbon nanotube (SWCNT). Its role consists in the enhancement of electronic conductivity of electrode materials, such as phosphate olivines, without requesting any significant increase of the electrode volume and mass. The SWCNT is linked to the redox molecule via non-covalent or covalent interaction with the hydrophobic part of the molecule or electrostatic interaction. The hydrophilic part of the molecule serves as the anchoring site for surface modification of the electrode active material. The redox potential of the molecule is close to the redox potential of the electrode active material. The adsorbed assembly of redox-molecule & SWCNT thus improves the charge transfer from a current collector to the electrode active material.Type: GrantFiled: October 18, 2007Date of Patent: January 17, 2012Assignee: Dow Global Technologies LLCInventors: Ivan Exnar, Shaik Mohammed Zakeeruddin, Michael Gratzel, Ladislav Kavan
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Patent number: 8003260Abstract: A lithium-ion battery comprising a first electrode made of cathodic material, a second electrode made of anodic material and an electrolyte, said lithium-ion battery containing an overcharge protection material consisting of redox molecules, characterized by the fact that said redox molecules have a reduction potential which is lower than said anodic material.Type: GrantFiled: September 5, 2007Date of Patent: August 23, 2011Assignee: Dow Global Technologies Inc.Inventors: Ivan Exnar, Qing Wang
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Publication number: 20100178562Abstract: The present invention concerns a carbon coated lithium metal phosphate material containing a manganese oxide layer between the LiMnPO4 material or the C/LiMn1-x ZxPO4 material, where Z?Fe, Co, Ni, Mg, Ca, Al, Zr, V, Ti and x=0.01-0.3, and the carbon layer.Type: ApplicationFiled: July 3, 2008Publication date: July 15, 2010Applicant: Dow Global TechnologiesInventors: Ivan Exnar, Thierry Drezen, Marketa Zukalova, James Miners, Otakar Frank, Ladislav Kavan
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Patent number: 7749658Abstract: The main object of the invention is to obtain LiMnPO4 having an excellent crystalline and a high purity at a lower temperature. The present invention provides a method for manufacturing LiMnPO4 including the steps of: precipitating for obtaining precipitate of manganese hydroxide (Mn(OH)x) by adding a precipitant to a Mn source solution in which a Mn source is dissolved; reducing for obtaining a reduced dispersion solution by dispersing the precipitate in a reducing solvent; adding for obtaining an added dispersion solution by adding a Li source solution and a P source solution to the reduced dispersion solution; pH adjusting for adjusting the pH of the added dispersion solution in the range of 3 to 6 to obtain a pH-adjusted dispersion solution; and synthesizing for synthesizing by reacting the pH-controlled dispersion solution by a heating under pressure condition.Type: GrantFiled: October 27, 2006Date of Patent: July 6, 2010Assignees: Toyota Jidosha Kabushiki Kaisha, Dow Global Technologies Inc.Inventors: Motoshi Isono, Thierry Drezen, Ivan Exnar, Ivo Teerlinck
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Publication number: 20100081059Abstract: A lithium-ion battery comprising a first electrode made of cathodic material, a second electrode made of anodic material and an electrolyte, said lithium-ion battery containing an overcharge protection material consisting of redox molecules, characterized by the fact that said redox molecules have a reduction potential which is lower than said anodic material.Type: ApplicationFiled: September 5, 2007Publication date: April 1, 2010Inventors: Ivan Exnar, Qing Wang
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Publication number: 20100068621Abstract: This invention concerns a novel method for surface derivatization of electrode materials for Li-ion batteries. The derivatization is based on adsorption of a composite assembly consisting of amphiphilic redox active molecule attached to single walled carbon nanotube (SWCNT). Its role consists in the enhancement of electronic conductivity of electrode materials, such as phosphate olivines, without requesting any significant increase of the electrode volume and mass. The SWCNT is linked to the redox molecule via non-covalent or covalent interaction with the hydrophobic part of the molecule or electrostatic interaction. The hydrophilic part of the molecule serves as the anchoring site for surface modification of the electrode active material. The redox potential of the molecule is close to the redox potential of the electrode active material. The adsorbed assembly of redox-molecule & SWCNT thus improves the charge transfer from a current collector to the electrode active material.Type: ApplicationFiled: October 18, 2007Publication date: March 18, 2010Inventors: Ivan Exnar, Shaik Mohammed Zakeeruddin, Michael Gratzel, Ladislav Kavan
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Publication number: 20090184296Abstract: The main object of the invention is to obtain LiMnPO4 having an excellent crystalline and a high purity at a lower temperature. The present invention provides a method for manufacturing LiMnPO4 including the steps of: precipitating for obtaining precipitate of manganese hydroxide (Mn(OH)x) by adding a precipitant to a Mn source solution in which a Mn source is dissolved; reducing for obtaining a reduced dispersion solution by dispersing the precipitate in a reducing solvent; adding for obtaining an added dispersion solution by adding a Li source solution and a P source solution to the reduced dispersion solution; pH adjusting for adjusting the pH of the added dispersion solution in the range of 3 to 6 to obtain a pH-adjusted dispersion solution; and synthesizing for synthesizing by reacting the pH-controlled dispersion solution by a heating under pressure condition.Type: ApplicationFiled: October 27, 2006Publication date: July 23, 2009Inventors: Motoshi Isono, Thierry Drezen, Ivan Exnar, Ivo Teerlinck
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Publication number: 20090186275Abstract: Novel process for the preparation of finely divided, nano-structured, olivine lithium metal phosphates (LiMPO.sub.4) (where metal M is iron, cobalt, manganese, nickel, vanadium, copper, titanium and mix of them) materials have been developed. This so called Polyol” method consists of heating of suited precursor materials in a multivalent, high-boiling point multivalent alcohol like glycols with the general formula HO—(—C2H4O—).sub.n-H where n=1-10 or HO—(—C3H6O—).sub.n.-H where n=1-10, or other polyols with the general formula HOCH2—(—C3H5OH—).sub.n-H where n=1-10, like for example the tridecane-1,4,7,10,13-pentaol. A novel method for implementing the resulting materials as cathode materials for Li.-ion batteries is also developed.Type: ApplicationFiled: April 6, 2006Publication date: July 23, 2009Inventors: Ivan Exnar, Thierry Drezen
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Publication number: 20090176162Abstract: This invention concerns a lithium rechargeable electrochemical cell containing electrochemical redox active compounds in the electrolyte. The cell is composed of two compartments, where the cathodic compartment comprises a cathodic lithium insertion material and one or more of p-type redox active compound(s) in the electrolyte; the anodic compartment comprises an anodic lithium insertion material and one or more of n-type redox active compound(s) in the electrolyte. These two compartments are separated by a separator and the redox active compounds are confined only in each compartment. Such a rechargeable electrochemical cell is suitable for high energy density applications. The present invention also concerns the general use of redox active compounds and electrochemically addressable electrode systems containing similar components which are suitable for use in the electrochemical cell.Type: ApplicationFiled: April 6, 2007Publication date: July 9, 2009Inventors: Ivan Exnar, Qing Wang, Michael Gratzel, Shaik Mohammed Zakeeruddin, Ladislav Kavan
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Publication number: 20090130560Abstract: A process for the production of nano-structured olivine lithium manganese phosphate (LiMnPO.sub.4) electrode material comprising of the following steps: sol gel preparation in a chelating environment; preparation of lithium manganese phosphate/carbon composite by ball-milling; and electrode preparation.Type: ApplicationFiled: February 13, 2006Publication date: May 21, 2009Inventors: Ivan Exnar, Thierry Drezen, Nam Hee Kwon-Roth, Motoshi Isono
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Publication number: 20090123837Abstract: This invention concerns a lithium rechargeable electrochemical cell comprising an electrochemically addressable electrode system. The electrodes are composed of a cathodic lithium insertion material (2) incorporating a p-type conductive compound (4), and an anodic lithium insertion material (3) incorporating an n-type conductive compound (5). Such a rechargeable electrochemical cell is suitable for high energy density applications. The present invention also concerns the general use of conductive compounds and electrochemically addressable electrode systems comprising similar components which are suitable for use in the electrochemical cell.Type: ApplicationFiled: June 2, 2006Publication date: May 14, 2009Inventors: Michael Gratzel, Ivan Exnar, Qing Wang
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Patent number: 6841295Abstract: The invention concerns a battery including a metallic container (1) delimiting a cavity (16) containing an electrolyte and a composite strip (2) formed by a first metallic sheet coated with a material forming the positive electrode, by a second metallic strip coated with a material forming the negative electrode and by porous insulating separators, composite strip (2) being wound onto a core (20) located at the centre of the cavity (16) and electrodes being connected by connecting means (8, 9) to external terminals (6, 7). It is characterized in that all or part of the central core (20) is made of a material with a high heat transmission coefficient in heat contact with at least the metallic closing cap (3).Type: GrantFiled: December 8, 2001Date of Patent: January 11, 2005Assignee: Renata AGInventor: Ivan Exnar
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Publication number: 20020081484Abstract: The battery includes a metal container containing active materials, forming respectively the anode and the cathode, and an electrolyte, said container being sealed at its upper part by a hermetically sealed cap and separated from the active materials by an insulating element, said cap being provided with two contact terminals, electrically connected to the anode and the cathode by connecting means, and a through passage formed by a tube arranged in proximity to or merged with the negative terminal, said through passage, connecting the interior and the exterior of the battery, being closed to wards the exterior by a metal hotmelt composition.Type: ApplicationFiled: December 4, 2001Publication date: June 27, 2002Applicant: RENATA A.G.Inventor: Ivan Exnar
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Publication number: 20020071986Abstract: The invention concerns a battery including a metallic container (1) delimiting a cavity (16) containing an electrolyte and a composite strip (2) formed by a first metallic sheet coated with a material forming the positive electrode, by a second metallic strip coated with a material forming the negative electrode and by porous insulating separators, said composite strip (2) being wound onto a core (20) located at the center of the cavity (16) and said electrodes being connected by connecting means (8, 9) to external terminals (6, 7). It is characterized in that all or part of the central core (20) is made of a material with a high heat transmission coefficient in heat contact with at least the metallic closing cap (3).Type: ApplicationFiled: December 8, 2001Publication date: June 13, 2002Inventor: Ivan Exnar
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Patent number: 5569561Abstract: A high capacity primary or secondary electrochemical generator in which at least one electrode (4,5) is composed of nanocrystalline particles of an electrically active material, said particles being electrically connected together, either by sintering a colloidal film of said electrically active material, or by compressing a mixture containing said nanocrystalline particles in pulverised form.Type: GrantFiled: January 20, 1995Date of Patent: October 29, 1996Assignee: Renata A.G.Inventors: Ivan Exnar, Michael Graetzel, Jean-Paul Randin