Patents by Inventor Kang Xu

Kang Xu 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).

  • Patent number: 7824802
    Abstract: A method of preparing a composite cathode active material having superior cell characteristics includes mixing and milling starting material, carbon and an organic complexing agent. The mixture is heated at a first temperature in an inert atmosphere to form a composite precursor, and then the precursor is ground and heated at a second temperature in an inert atmosphere to produce a carbon-containing composite cathode material having high electronic conductivity. The said composite cathode has a general formula of LiFe1?xMxPO4—C, within 0?x<1, M is selected from the group consisting of Co, Ni, V, Cr, Mn and a mixture thereof.
    Type: Grant
    Filed: January 17, 2007
    Date of Patent: November 2, 2010
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Shengshui Zhang, Kang Xu, T. Richard Jow
  • Publication number: 20100129721
    Abstract: A non-aqueous rechargeable electrochemical cell includes an electrolyte composition produced through the dissolution of a thermally stable lithium salt in a lactone solvent. The resulting cell has stable performance in a wide temperature range between ?40° C. and 80° C. The resulting cell operates across this wide temperature range with a commercially acceptable capacity retention, power loss characteristics, and safety characteristics across this temperature range.
    Type: Application
    Filed: February 1, 2006
    Publication date: May 27, 2010
    Inventors: Kang Xu, Shengshui Zhang, T. Richard Jow
  • Patent number: 7524579
    Abstract: A method for enhancing the performance characteristics of a battery through the use of the electrolyte composition comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPF6 and LiBF4. The additive salt is present in an amount of 0.1-60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte.
    Type: Grant
    Filed: December 21, 2006
    Date of Patent: April 28, 2009
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: T. Richard Jow, Shengshui Zhang, Kang Xu
  • Publication number: 20080292839
    Abstract: An artificial bone composite structure is provided. This structure includes a fibrous matrix that itself includes a plurality of fibers. Also, the structure includes a plurality of hydroxyapatite (HA) particles. These particles are dispersed within the fibrous matrix. Also, the HA particles have controlled size and aspect ratios and are aligned along long axes of the fibers. In some instances, the fibers include poly-(L-lactic acid) (PLLA).
    Type: Application
    Filed: March 26, 2008
    Publication date: November 27, 2008
    Inventors: Mei Wei, Fei Peng, Zhi-kang Xu
  • Patent number: 7442471
    Abstract: A non-aqueous electrolyte solution for lithium or a lithium ion cell, which improves lithium ion cell capacity retention and enhances storage life thereof. The non-aqueous solution can be implemented in the context of an electrolyte system that includes a lithium salt dissolved in a solvent formed from a mixture of one or more cyclic esters, and/or one or more chain esters, and at least one lactam based solvent. Such a system is suited for use with electrochemical energy storage devices, which are based on non-aqueous electrolytes, such as high energy density batteries and/or high power electrochemical capacitors. Such an electrochemical storage devices is generally based on non-aqueous electrolytes that include lithium salt dissolved in a solvent system.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: October 28, 2008
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: T. Richard Jow, Shengshui Zhang, Kang Xu, Michael S. Ding
  • Publication number: 20080168865
    Abstract: A method of preparing a composite cathode active material having superior cell characteristics includes mixing and milling starting material, carbon and an organic complexing agent. The mixture is heated at a first temperature in an inert atmosphere to form a composite precursor, and then the precursor is ground and heated at a second temperature in an inert atmosphere to produce a carbon-containing composite cathode material having high electronic conductivity The said composite cathode has a general formula of LiFe1-xMxPO4—C, within 0?x<1, M is selected from the group consisting of Co, Ni, V, Cr, Mn and a mixture thereof.
    Type: Application
    Filed: January 17, 2007
    Publication date: July 17, 2008
    Applicant: US GOVT AS REPRESENTED BY SECT. OF ARMY
    Inventors: Shengshui Zhang, Kang Xu, T. Richard Jow
  • Patent number: 7172834
    Abstract: A lithium battery includes an electrolyte comprised of a non-aqueous solvent, and a salt mixture. The salt mixture includes an alkali metal electrolyte salt and an additive salt having an anion of a mixed anhydride of oxalic acid and boric acid. Specific additive salts include lithium bis(oxalato) borate and lithium oxalyldifluoroborate. Particular electrolyte salts comprise LiPF6 and LiBF4. The additive salt is present in an amount of 0.1–60 mole percent of the total of the additive salt and electrolyte salt content of the electrolyte. Also disclosed is a method for enhancing the performance characteristics of a lithium battery through the use of the electrolyte composition. Also disclosed is the compound lithium oxalyldifluoroborate.
    Type: Grant
    Filed: July 24, 2003
    Date of Patent: February 6, 2007
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: T. Richard Jow, Shengshui Zhang, Kang Xu
  • Patent number: 6939647
    Abstract: Non-aqueous electrolyte solutions capable of protecting lithium metal and lithium-inserted carbonaceous electrodes include an electrolyte salt, preferably LiPF6, and a non-aqueous electrolyte solvent mixture comprising at least one of trialkyl phosphites, one or more cyclic or/and linear carbonates, and optionally other additives, such as, gelling agents, ionically conductive solid polymers, and other additives. The trialkyl phosphites have the following general formula: wherein the oxidation number of the phosphorus atom is III (three), R1, R2, and R3 are the same or different, independently selected from linear or branched alkyl groups having 1 to 4 carbon atoms, optionally but not limited to, with one or more of the alkyl substituents being substituted by one or more halogen atoms, preferably fluorine atoms.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: September 6, 2005
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: T. Richard Jow, Shengshui Zhang, Kang Xu, Michael S. Ding
  • Patent number: 6924061
    Abstract: A non-aqueous electrolyte to be used in a Li-ion battery includes a lithium salt, a cyclic carbonate, a linear carbonate and an alkyl fluorinated phosphate, of the following general formula wherein R1, R2 and R3, independently, are selected from the group consisting of straight and branched alkyl groups having 1-5 carbon atoms, and at least one of said alkyl groups is fluorinated, with the locations of said fluorination being at least ?-positioned away from the phosphorous of said phosphate, such that said alkyl phosphate has a F/H ratio of at least 0.25, and said electrolyte solution is non-flammable.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: August 2, 2005
    Assignee: The United States of America as represented by the Secretary of Army
    Inventors: T. Richard Jow, Kang Xu, Shengshui Zhang, Michael S. Ding
  • Patent number: 6905762
    Abstract: A non-aqueous electrolyte to be used in a Li-ion battery includes a lithium salt, a cyclic carbonate, a linear carbonate and an isocyanate-based additive, with the following general formula R1—N?C?O wherein R1 represents linear or branched alkyl groups which have 1 to 7 carbon atoms, or aromatic groups having the following general formula wherein R2 and R3, which may be the same or different and located at any positions of carbons 2, 2?, 3, 3? and 4 in the benzyl ring, represent hydrogen atoms or halogen atoms, isocyanate groups, either groups, ester groups or alkyl groups, having 1 to 3 carbon atoms, and are optionally substituted with halogen atoms.
    Type: Grant
    Filed: February 1, 2002
    Date of Patent: June 14, 2005
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: T. Richard Jow, Shengshui Zhang, Kang Xu, Michael S. Ding
  • Publication number: 20040222401
    Abstract: Based on the discovery that the melting point and solubility of onium salts are affected by the asymmetry of the substitution on cation, and that the branched substituents effectively shield onium cations from electrochemical reduction, new onium salts are synthesized and high performance electrolytes based on these salts for electrochemical capacitor are provided. The composition of the new electrolyte comprises an onium salt or mixture of such onium salts dissolved in aprotic, non-aqueous solvents or mixture of such solvents. The electrolyte is able to perform at high rate of charge/discharge, at low ambient temperatures, and within wide operating voltage, due to the high solubility, low melting temperature, and the improved reduction stability of the new onium cations, respectively.
    Type: Application
    Filed: May 28, 2004
    Publication date: November 11, 2004
    Inventors: Kang Xu, Shengping Ding, T. Richard Jow
  • Patent number: 6743947
    Abstract: Based on the discovery that the melting point and solubility of onium salts are affected by the asymmetry of the substitution on cation, and that the branched substituents effectively shield onium cations from electrochemical reduction, new onium salts are synthesized and high performance electrolytes based on these salts for electrochemical capacitor are provided. The composition of the new electrolyte comprises an onium salt or mixture of such onium salts dissolved in aprotic, non-aqueous solvents or mixture of such solvents. The electrolyte is able to perform at high rate of charge/discharge, at low ambient temperatures, and within wide operating voltage, due to the high solubility, low melting temperature, and the improved reduction stability of the new onium cations, respectively.
    Type: Grant
    Filed: May 10, 1999
    Date of Patent: June 1, 2004
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Kang Xu, Shengping Ding, T. Richard Jow
  • Patent number: 6245465
    Abstract: The present invention pertains to non-aqueous electrolyte solvents which comprise a non-symmetrical, non-cyclic sulfone and which are suitable for use in secondary electric current producing cells. The present invention also pertains to electrolyte elements comprising such solvents, electric current producing cells comprising such electrolyte elements, and methods for making such electric current producing cells. More particularly, the present invention pertains to electrolyte elements comprising a non-aqueous electrolyte solvent, which solvent comprises a non-symmetrical, non-cyclic sulfone of the general formula R1—SO2—R2, wherein R1 and R2 are independently linear or branched alkyl or partially or fully fluorinated linear or branched alkyl groups having 1 to 7 carbon atoms, wherein R1 and R2 are different, and wherein —SO2— denotes the sulfone group.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: June 12, 2001
    Assignee: Moltech Corporation
    Inventors: Charles Austen Angell, Kang Xu, Igor P. Kovalev, Terje A. Skotheim
  • Patent number: 5962169
    Abstract: The present invention relates generally to highly conductive alkali-metal ion non-crystalline electrolyte systems, and more particularly to novel and unique molten (liquid), rubbery, and solid electrolyte systems which are especially well suited for use with high current density electrolytic cells such as primary and secondary batteries.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: October 5, 1999
    Assignee: Arizona Board of Regents
    Inventors: Charles Austen Angell, Changle Liu, Kang Xu, Terje A. Skotheim
  • Patent number: 5855809
    Abstract: This invention relates generally to inorganic ionic liquids which function as electrolytes and do not crystallize at ambient temperature. More specifically, this invention is directed to quasi-salt inorganic ionic liquids which comprise the reaction product of a strong Lewis acid with an inorganic halide-donating molecule. This invention is further directed to quasi-salt inorganic ionic liquid mixtures which comprise combinations of electrolyte additives and quasi-salt inorganic ionic liquids. These quasi-salt inorganic ionic liquid mixtures are useful electrolytes.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: January 5, 1999
    Assignee: Arizona Board Of Regents
    Inventors: Charles Austen Angell, Sheng-Shui Zhang, Kang Xu
  • Patent number: 5849432
    Abstract: The present invention relates to electrolyte solvents for use in liquid or rubbery electrolyte solutions. Specifically, this invention is directed to boron-containing electrolyte solvents and boron-containing electrolyte solutions.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: December 15, 1998
    Assignee: Arizona Board of Regents
    Inventors: Charles Austen Angell, Sheng-Shui Zhang, Kang Xu
  • Patent number: 5824433
    Abstract: This invention relates generally to electrolyte solvents for use in liquid or rubbery polymer electrolyte solutions as are used, for example, in electrochemical devices. More specifically, this invention relates to sulfonyl/phospho-compound electrolyte solvents and sulfonyl/phospho-compound electrolyte solutions incorporating such solvents.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: October 20, 1998
    Assignee: Arizona Board of Regents
    Inventors: Charles Austen Angell, Sheng-Shui Zhang, Kang Xu
  • Patent number: 5786110
    Abstract: High-conductivity alkali-metal-ion containing electrolytes comprising viscous liquid or rubbery solid alkali metal salts which obtain conductivity by the domainate motion of cation ions which, when produced in accordance herewith, remain freely mobile at low temperatures. One embodiment relates to molten alkali metal salt electrolytes comprised of one or more alkali metal salt compositions which are substantially non-crystalline and have glass transition temperatures below room temperature.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: July 28, 1998
    Assignee: Arizona Board of Regents
    Inventors: C. Austen Angell, Changle Liu, Kang Xu
  • Patent number: 5484670
    Abstract: A liquid, predominantly lithium-conducting, ionic electrolyte is described which has exceptionally high conductivity at temperatures of 100.degree. C. or lower, including room temperature. It comprises molten lithium salts or salt mixtures in which a small amount of an anionic polymer lithium salt is dissolved to stabilize the liquid against recrystallization. Further, a liquid ionic electrolyte which has been rubberized by addition of an extra proportion of anionic polymer, and which has good chemical and electrochemical stability, is described. This presents an attractive alternative to conventional salt-in-polymer electrolytes which are not cationic conductors.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: January 16, 1996
    Assignee: Arizona Board of Regents, a body corporate of the state of Arizona, acting for Arizona State University
    Inventors: C. Austen Angell, Kang Xu, Changle Liu