Patents Represented by Attorney Michael D. Ross
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Patent number: 7261977Abstract: The invention provides new and novel lithium-metal-fluorophosphates which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-metal-fluorophosphates. The lithium-metal-fluorophosphates comprise lithium and at least one other metal besides lithium.Type: GrantFiled: January 14, 2005Date of Patent: August 28, 2007Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
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Patent number: 7214448Abstract: The present invention relates to novel electrode active materials represented by the general formula AaMb(XY4)2Zd, wherein: (a) A is one or more alkali metals, and 0<a?8; (b) M is at least one metal capable of undergoing oxidation to a higher valence state, and 1?b?3; (c) XY4 is selected from the group consisting of X?O4?xY?x, X?O4?yY?2?y, X?S4, and a mixture thereof, where X? is P, As, Sb, Si, Ge, S, and mixtures thereof; X? is P, As, Sb, Si, Ge, and mixtures thereof, Y? is halogen, 0?x<3, 0<y<4, and 0<c?3; and (d) Z is OH, a halogen, or mixtures thereof, and 0<d?6.Type: GrantFiled: June 16, 2004Date of Patent: May 8, 2007Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
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Patent number: 7205067Abstract: The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to the first electrode, and an electrolyte. The first electrode includes a polyanion-based electrode active material. The electrochemical cell is in a heat transfer relationship with a heat dissipation subassembly containing one or more passive heat sinks for dissipating heat generated by the cell.Type: GrantFiled: January 24, 2006Date of Patent: April 17, 2007Assignee: Valence Technology, Inc.Inventors: Stephan Godevais, Joe Lamoreux, Larry Stone
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Patent number: 7087346Abstract: Electrode active materials comprising lithium or other alkali metals, a transition metal, and a phosphate or similar moiety, of the formula: Aa+xMbP1?xSixO4 wherein (a) A is selected from the group consisting of Li, Na, K, and mixtures thereof, and 0<a<1.0 and 0?x?1; (b) M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, where 0<b?2; and wherein M, a, b, and x are selected so as to maintain electroneutrality of said compound.Type: GrantFiled: September 20, 2004Date of Patent: August 8, 2006Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
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Patent number: 7041239Abstract: Electrode active materials comprising two or more groups of particles having differing chemical compositions, wherein each group of particles comprises a material selected from: (a) materials of the formula A1aM1b(XY4)cZd; and (b) materials of the formula A2eM2fOg; and wherein (i) A1, A2, and A3 are Li, Na, or K; (ii) M1 and M3 comprise a transition metal; (iv) XY4 a phosphate or similar moiety; and (v) Z is OH, or halogen. In a preferred embodiment, A2eM3fOg is A3hMniO4 having an inner and an outer region, wherein the inner region comprises a cubic spinel manganese oxide, and the outer region comprises a manganese oxide enriched in Mn+4 relative to the inner region. In a preferred embodiment, the compositions also comprise a basic compound.Type: GrantFiled: April 3, 2003Date of Patent: May 9, 2006Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Tracy E. Kelley
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Patent number: 7026072Abstract: The invention provides novel lithium-mixed metal materials which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-mixed metal materials. Methods for making the novel lithium-mixed metal materials and methods for using such lithium-mixed metal materials in electrochemical cells are also provided. The lithium-mixed metal materials comprise lithium and at least one other metal besides lithium. Preferred materials are lithium-mixed metal phosphates which contain lithium and two other metals besides lithium.Type: GrantFiled: April 19, 2005Date of Patent: April 11, 2006Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi
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Patent number: 7019487Abstract: Circuits, apparatuses, electrochemical device charging methods, and lithium-mixed metal electrode cell charging methods are provided. According to one aspect, a circuit includes charging circuitry adapted to apply electrical energy to an electrochemical device to charge the electrochemical device, and the electrochemical device being configured to assume an open-circuit condition in a substantially charged state; shunting circuitry electrically coupled with the charging circuitry and configured to shunt the electrical energy around the electrochemical device responsive to the electrochemical device reaching the substantially charged state; and indication circuitry configured to output a signal responsive to the shunting of the electrical energy to indicate a charge status of the electrochemical device.Type: GrantFiled: June 10, 2005Date of Patent: March 28, 2006Assignee: Valence Technology, Inc.Inventor: John Cummings
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Patent number: 7008566Abstract: The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to said first electrode, and an electrolyte material interposed there between. The first electrode includes an active material having an alkali metal-containing oligo phosphate-based electrode active material.Type: GrantFiled: April 8, 2003Date of Patent: March 7, 2006Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi
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Patent number: 7008726Abstract: The invention provides an electrochemical cell which includes a first electrode and a second electrode which is a counter electrode to said first electrode, and an electrolyte material interposed there between. The first electrode comprises an electrode active material represented by the general nominal formula Aa[Mm,MIn,MIIo](XY4)dZe, wherein at least one of M, MI and MII is a redox active element, 0<m,n,o?4, and ½[V(MI)+V(MII)]=V(M), wherein V(M) is the valence state of M, V(MI) is the valence state of MI, and V(MII) is the valence state of MII.Type: GrantFiled: January 22, 2004Date of Patent: March 7, 2006Assignee: Valence Technology, Inc.Inventors: George Adamson, Jeremy Barker, M. Yazid Saidi
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Patent number: 7001690Abstract: The invention provides novel lithium-mixed metal materials which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-mixed metal materials. Methods for making the novel lithium-mixed metal materials and methods for using such lithium-mixed metal materials in electrochemical cells are also provided. The lithium-mixed metal materials comprise lithium and at least one other metal besides lithium. Preferred materials are lithium-mixed metal phosphates which contain lithium and two other metals besides lithium.Type: GrantFiled: January 18, 2000Date of Patent: February 21, 2006Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi
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Patent number: 6964827Abstract: The present invention relates to novel electrode active materials represented by the general formula AaMb(XY4)cZd, wherein: (a) A is one or more alkali metals, and 0<a?8; (b) M is at least one metal capable of undergoing oxidation to a higher valence state, and 1?b?3; (c) XY4 is selected from the group consisting of X?O4?xY?x, X?O4?yY?2y, X?S4, and a mixture thereof, where X? is P, As, Sb, Si, Ge, S, and mixtures thereof; X? is P, As, Sb, Si, Ge, and mixtures thereof, Y? is halogen, 0?x<3, 0<y<4, and 0<c?3; and (d) Z is OH, a halogen, mixtures thereof, and 0<d?6.Type: GrantFiled: November 7, 2001Date of Patent: November 15, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey L. Swoyer
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Patent number: 6919708Abstract: Circuits, apparatuses, electrochemical device charging methods, and lithium-mixed metal electrode cell charging methods are provided. According to one aspect, a circuit includes charging circuitry adapted to apply electrical energy to an electrochemical device to charge the electrochemical device, and the electrochemical device being configured to assume an open-circuit condition in a substantially charged state; shunting circuitry electrically coupled with the charging circuitry and configured to shunt the electrical energy around the electrochemical device responsive to the electrochemical device reaching the substantially charged state; and indication circuitry configured to output a signal responsive to the shunting of the electrical energy to indicate a charge status of the electrochemical device.Type: GrantFiled: April 19, 2004Date of Patent: July 19, 2005Assignee: Valence Technology, Inc.Inventor: John Cummings
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Patent number: 6914417Abstract: An electrical energy system comprising a power supply apparatus having an electrical energy storage device for storing electrical energy, an external load having one or more batteries, the load adapted to receive electrical energy from the electrical energy storage device, and wherein the power supply apparatus comprises control circuitry for monitoring a condition of the power supply apparatus and controlling an operation of the load responsive to the monitored condition.Type: GrantFiled: April 29, 2003Date of Patent: July 5, 2005Assignee: Valence Technology, Inc.Inventor: John Cummings
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Patent number: 6908710Abstract: The invention provides lithiated molybdenum oxides useful as cathode (positive electrode) active materials in rechargeable batteries, especially in lithium ion rechargeable batteries. In one aspect, the invention provides lithiated molybdenum oxides, some of which can be represented by nominal formulas LixMoO2 where x ranges from 0.1 to 2, and Li4Mo3O8. The crystal structure of the lithiated molybdenum oxides of the invention is characterized as being in a hexagonal space group with unit cell dimensions in a determined range. In a preferred embodiment, the lithiated molybdenum oxides of the invention can be formulated with known materials to provide electrodes for electrochemical cells. The invention also provides rechargeable batteries made by combining one or more such electrochemical cells.Type: GrantFiled: October 9, 2001Date of Patent: June 21, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey L. Swoyer
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Patent number: 6890686Abstract: The invention provides novel lithium-containing phosphate materials having a high proportion of lithium per formula unit of the material. Upon electrochemical interaction, such material deintercalates lithium ions, and is capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-containing phosphates.Type: GrantFiled: February 22, 2000Date of Patent: May 10, 2005Assignee: Valence Technology, Inc.Inventor: Jeremy Barker
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Patent number: 6884544Abstract: The invention provides novel active material represented by the general formula LiaMI1-yMIIyPO4, wherein MI is selected from the group consisting of Fe, Ni, Mn, V, Sn, Ti, Cr, and mixtures thereof; MII is selected from the group consisting of Zn, Cd, and a mixture thereof; a is about 1; and 0<y<1, which, upon electrochemical interaction, releases lithium ions, and is capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel active material, wherein MI is selected from the group consisting of Fe, Co, Ni, Mn, Cu, V, Sn, Ti, Cr, and mixtures thereof. Methods for making the novel active material and methods for using such a material in electrochemical cells are also provided.Type: GrantFiled: November 25, 2002Date of Patent: April 26, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi
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Patent number: 6872492Abstract: Sodium ion batteries are based on sodium based active materials selected among compounds of the general formula: AaMb(XY4)cZd, wherein A comprises sodium, M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, Z is OH or halogen, and XY4 represents phosphate or a similar group. The anode of the battery includes a carbon material that is capable of inserting sodium ions. The carbon anode cycles reversibly at a specific capacity greater than 100 mAh/g.Type: GrantFiled: April 4, 2002Date of Patent: March 29, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey L. Swoyer
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Patent number: 6869547Abstract: Stabilized lithiated manganese oxide (LMO) is prepared by reacting cubic spinel lithium manganese oxide particles and particles of an alkali metal compound in air for a time and at a temperature sufficient to decompose at least a portion of the alkali metal compound, providing a treated lithium manganese oxide. The reaction product is characterized as particles having a core or bulk structure of cubic spinel lithium manganese oxide and a surface region which is enriched in Mn+4 relative to the bulk. X-ray diffraction data and x-ray photoelectron spectroscopy data are consistent with the structure of the stabilized LMO being a central bulk of cubic spinel lithium manganese oxide with a surface layer or region comprising A2MnO3, where A is an alkali metal. Electrochemical cells containing the stabilized LMO of the invention have improved charging and discharging characteristics and maintain integrity over a prolonged life cycle.Type: GrantFiled: October 9, 2001Date of Patent: March 22, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saldi, Jeffrey L. Swoyer
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Patent number: 6855462Abstract: The invention provides new and novel lithium-metal-fluorophosphates which, upon electrochemical interaction, release lithium ions, and are capable of reversibly cycling lithium ions. The invention provides a rechargeable lithium battery which comprises an electrode formed from the novel lithium-metal-fluorophosphates. The lithium-metal-fluorophosphates comprise lithium and at least one other metal besides lithium.Type: GrantFiled: April 26, 2002Date of Patent: February 15, 2005Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey Swoyer
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Patent number: 6815122Abstract: Electrode active materials comprising lithium or other alkali metals, a transition metal, and a phosphate or similar moiety, of the formula: Aa+xMbP1−xSixO4 wherein (a) A is selected from the group consisting of Li, Na, K, and mixtures thereof, and 0<a<1.0 and 0≦x≦1; (b) M comprises one or more metals, comprising at least one metal which is capable of undergoing oxidation to a higher valence state, where 0<b≦2; and wherein M, a, b, and x are selected so as to maintain electroneutrality of the compound. In a preferred embodiment, M comprises at least one transition metal selected from Groups 4 to 11 of the Periodic Table. In another preferred embodiment, M comprises M′cM″d, where M′ is at least one transition metal from Groups 4 to 11 of the Periodic Table; and M″ is at least one element from Groups 2, 3, 12, 13, or 14 of the Periodic Table, and c+d=b. Preferably, 0.1≦a≦0.8.Type: GrantFiled: March 6, 2002Date of Patent: November 9, 2004Assignee: Valence Technology, Inc.Inventors: Jeremy Barker, M. Yazid Saidi, Jeffrey L. Swoyer