Patents by Inventor Michael R. Wixom
Michael R. Wixom 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: 9979053Abstract: A rechargeable, hybrid battery system incorporates a high power battery component and a high energy density battery component. The voltage of the high energy density battery varies as a function of its state of charge, but remains greater than the voltage of the high power battery throughout the operating range of the battery system.Type: GrantFiled: December 5, 2012Date of Patent: May 22, 2018Assignee: A123 Systems, LLCInventors: Viet Vu, Michael R. Wixom
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Publication number: 20140368158Abstract: A rechargeable, hybrid battery system incorporates a high power battery component and a high energy density battery component. The voltage of the high energy density battery varies as a function of its state of charge, but remains greater than the voltage of the high power battery throughout the operating range of the battery system.Type: ApplicationFiled: December 5, 2012Publication date: December 18, 2014Applicant: A123 SYSTEMS, INC.Inventors: Viet Vu, Michael R. Wixom
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Publication number: 20120199784Abstract: Materials useful as electrodes for lithium batteries have very good electronic and ionic conductivities. They are fabricated from a starting mixture which includes a metal, a phosphate ion, and an additive which enhances the transport of lithium ions in the resultant material. The mixture is heated in a reducing environment to produce the material. The additive may comprise a pentavalent metal or a carbon. In certain embodiments the material is a two-phase material. Also disclosed are electrodes which incorporate the materials and lithium batteries which incorporate those electrodes.Type: ApplicationFiled: April 18, 2012Publication date: August 9, 2012Applicant: A123 Systems, Inc.Inventors: Michael R. Wixom, Chuanjing Xu
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Patent number: 8076030Abstract: Disclosed is a lithium titanate material, which may include an additive, and its use as an electrode in a battery. Specifically disclosed is a lithium titanate based material, with primary particle size larger than 100 nm, having very good high rate charge and discharge capabilities when incorporated into a lithium battery.Type: GrantFiled: December 12, 2007Date of Patent: December 13, 2011Assignee: A123 Systems, Inc.Inventors: Pu Zhang, Suresh Mani, Yet-Ming Chiang, Shih-Chieh Yin, Brian Glomski, Young-Il Jang, Christopher Silkowski, Michael R. Wixom
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Publication number: 20110068298Abstract: Materials useful as electrodes for lithium batteries have very good electronic and ionic conductivities. They are fabricated from a starting mixture which includes a metal, a phosphate ion, and an additive which enhances the transport of lithium ions in the resultant material. The mixture is heated in a reducing environment to produce the material. The additive may comprise a pentavalent metal or a carbon. In certain embodiments the material is a two-phase material. Also disclosed are electrodes which incorporate the materials and lithium batteries which incorporate those electrodes.Type: ApplicationFiled: November 29, 2010Publication date: March 24, 2011Applicant: A123 Systems, Inc.Inventors: Michael R. WIXOM, Chuanjing XU
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Patent number: 7879493Abstract: Disclosed is a doped lithium titanate and its use as an electrode in a battery. Further disclosed is a method for making an alkali metal titanate, which method includes mixing an alkali metal compound and a titanium compound, impact milling the mixture, and heating the milled mixture for a time, and at a temperature, sufficient to convert the mixture to the alkali metal titanate. The alkali metal compound can be in the form of Li2CO3 and the titanium compound can be in the form of TiO2. A dopant may be included in the mixture.Type: GrantFiled: June 4, 2007Date of Patent: February 1, 2011Assignee: A123 Systems, Inc.Inventors: Pu Zhang, Suresh Mani, Michael R. Wixom
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Patent number: 7842420Abstract: Materials useful as electrodes for lithium batteries have very good electronic and ionic conductivities. They are fabricated from a starting mixture which includes a metal, a phosphate ion, and an additive which enhances the transport of lithium ions in the resultant material. The mixture is heated in a reducing environment to produce the material. The additive may comprise a pentavalent metal or a carbon. In certain embodiments the material is a two-phase material. Also disclosed are electrodes which incorporate the materials and lithium batteries which incorporate those electrodes.Type: GrantFiled: February 2, 2006Date of Patent: November 30, 2010Assignee: A123 Systems, Inc.Inventors: Michael R. Wixom, Chuanjing Xu
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Publication number: 20090170002Abstract: Disclosed is a lithium titanate material, which may include an additive, and its use as an electrode in a battery. Specifically disclosed is a lithium titanate based material, with primary particle size larger than 100 nm, having very good high rate charge and discharge capabilities when incorporated into a lithium battery.Type: ApplicationFiled: December 12, 2007Publication date: July 2, 2009Inventors: Pu Zhang, Suresh Mani, Yet-Ming Chiang, Shih-Chieh Yin, Brian Glomski, Young-II Jang, Christopher Silkowski, Michael R. Wixom
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Publication number: 20070281211Abstract: Disclosed is a doped lithium titanate and its use as an electrode in a battery. Further disclosed is a method for making an alkali metal titanate, which method includes mixing an alkali metal compound and a titanium compound, impact milling the mixture, and heating the milled mixture for a time, and at a temperature, sufficient to convert the mixture to the alkali metal titanate. The alkali metal compound can be in the form of Li2CO3 and the titanium compound can be in the form of TiO2. A dopant may be included in the mixture.Type: ApplicationFiled: June 4, 2007Publication date: December 6, 2007Applicant: T/J Technologies, Inc.Inventors: Pu Zhang, Suresh Mani, Michael R. Wixom
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Patent number: 7282301Abstract: A composite material includes a first phase which comprises LixMy(PO4)z wherein M is at least one metal, y and z are independently 0, and x is less than or equal to 1. The material includes a second phase which has an electronic and/or lithium ion conductivity greater than that of the first phase. The material is prepared by heating a starting mixture which includes lithium, iron, a phosphate ion, and a catalyst in a reducing atmosphere. Also disclosed are electrodes which incorporate the material and batteries which utilize those electrodes as cathodes.Type: GrantFiled: October 28, 2005Date of Patent: October 16, 2007Assignee: T/J Technologies, Inc.Inventors: Michael R. Wixom, Chuanjing Xu
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Patent number: 5888669Abstract: A non-oxide, transition metal based ceramic material has the general formula A.sub.y M.sub.2 Z.sub.x, wherein A is a group IA element, M is a transition metal and Z is selected from the group consisting of N, C, B, Si, and combinations thereof, and wherein x.ltoreq.2 and y.ltoreq.6-x. In these materials, the group IA element occupies interstitial sites in the metallic lattice, and may be readily inserted into or released therefrom. The materials may be used as catalysts and as electrodes. Also disclosed herein are methods for the fabrication of the materials.Type: GrantFiled: March 14, 1997Date of Patent: March 30, 1999Assignee: T/J/ TechnologiesInventors: Levi T. Thompson, Jr., Michael R. Wixom
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Patent number: 5837630Abstract: Mesoporous desigels are fabricated as nitrides, carbides, borides, and silicides of metals, particularly transition metals, and most particularly early transition metals. The desigels are prepared by forming a gel of a metallic compound, and removing solvent from the gel. In some instances, the thus produced desigel may be further reacted to change its composition, while preserving its mesoporous structure. The materials are particularly suited as electrodes for capacitors, including ultracapacitors, and for batteries.Type: GrantFiled: October 31, 1996Date of Patent: November 17, 1998Assignee: T/J Technologies Inc.Inventors: Lynne Owens, Levi T. Thompson, Jr., Michael R. Wixom
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Patent number: 5680292Abstract: High surface area electrodes for use in electrical and electrochemical energy storage and conversion devices comprise conductive transition metal nitrides, carbides, borides or combinations thereof where the metal is molybdenum or tungsten. Disclosed is a method of manufacturing such electrodes by forming or depositing a layer of metal oxide, then exposing the metal oxide layer at elevated temperature to a source of nitrogen, carbon or boron in a chemically reducing environment to form the desired metal nitride, carbide or boride film. Also disclosed is an ultracapacitor comprised of the new high surface area electrodes having a specific capacitance of 100 mF/cm.sup.2 and an energy density of 100 mJ/cm.sup.3 with improved conductivity and chemical stability when compared to currently available electrodes.Type: GrantFiled: December 12, 1994Date of Patent: October 21, 1997Assignee: T/J Technologies, Inc.Inventors: Levi T. Thompson, Jr., Michael R. Wixom, Jeffery M. Parker
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Patent number: 4991150Abstract: A piezoelectric or ferroelectric stress sensing material in intimate electrical communication with an electroluminescent material produces light at an amplitude dependent on the stress applied to the stress sensing material. The light signal is transmitted from the electroluminescent material by fiber optic cable to an optical signal detector. In the preferred embodiments the electroluminescent material comprises a light emitting diode as a small electrical short circuit load across two otherwise insulated faces of a piezoelectric or ferroelectric element. The embodiments include a composite stress sensing and electroluminescent material, separate stress sensing and electroluminescent materials joined by conductive film, foil or wire and additional means to bias, amplify and control the optical signal produced by the electroluminescent material and transmitted by the fiber optic cable.Type: GrantFiled: August 10, 1989Date of Patent: February 5, 1991Inventor: Michael R. Wixom