Patents by Inventor Hyo Shik Kil

Hyo Shik Kil 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: 8268198
    Abstract: Provided is a precursor for the preparation of a lithium transition metal oxide that is used for the preparation of a lithium transition metal oxide as a cathode active material for a lithium secondary battery, through a reaction with a lithium-containing compound, wherein the precursor contains two or more transition metals, and sulfate ion (SO4)-containing salt ions derived from a transition metal salt for the preparation of the precursor have a content of 0.1 to 0.7% by weight, based on the total weight of the precursor.
    Type: Grant
    Filed: April 3, 2009
    Date of Patent: September 18, 2012
    Assignee: LG Chem, Ltd.
    Inventors: Ho Suk Shin, Sung kyun Chang, Hong-Kyu Park, Sinyoung Park, Youngsun Choi, Seung Tae Hong, Hyo-shik Kil
  • Publication number: 20110315917
    Abstract: Provided is a lithium transition metal oxide having an ?-NaFeO2 layered crystal structure, as a cathode active material for lithium secondary battery, wherein the transition metal includes a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is +3 or higher, and the lithium transition metal oxide satisfies Equations 1 and 2 below: 1.0<m(Ni)/m(Mn)??(1) m(Ni2+)/m(Mn4+)<1??(2) wherein m(Ni)/m(Mn) represents a molar ratio of nickel to manganese and m(Ni2+)/m(Mn4+) represents a molar ratio of Ni2+ to Mn4+. The cathode active material of the present invention has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, in contrast to conventional cathode active materials, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.
    Type: Application
    Filed: February 25, 2011
    Publication date: December 29, 2011
    Applicant: LG CHEM, LTD.
    Inventors: Sung kyun CHANG, Hong-Kyu PARK, Sinyoung PARK, Hyo-shik KIL, Hera LEE
  • Publication number: 20110287315
    Abstract: Provided is a cathode active material having a composition represented by the following Formula I: LiFe(P1-XO4) (I) wherein a molar fraction (1-x) of phosphorus (P) is in the range of 0.910 to 0.999, to allow operational efficiency of the cathode active material to be leveled to a lower operational efficiency of an anode active material and improve energy density of the cathode active material. Furthermore, a cathode active material, wherein a molar fraction (1-x) of phosphorus (P) is lower than 1, contains both Fe2+ and Fe3+, thus advantageously preventing structural deformation, improving ionic conductivity, exhibiting superior rate properties and inhibiting IR drop upon charge/discharge, thereby imparting high energy density to batteries.
    Type: Application
    Filed: October 22, 2009
    Publication date: November 24, 2011
    Applicant: LG CHEM, LTD.
    Inventors: Sanghoon Choy, Yong Tae Lee, Hong-Kyu Park, Soo Min Park, Hyo-shik Kil, Cheol-Hee Park, Ji Eun Lee
  • Publication number: 20110140036
    Abstract: Provided is a cathode active material which is lithium transition metal oxide having an ?-NaFeO2 layered crystal structure, wherein the transition metal is a blend of Ni and Mn, an average oxidation number of the transition metals except lithium is +3 or higher, and lithium transition metal oxide satisfies the Equation m(Ni)?m(Mn) (in which m (Ni) and m (Mn) represent an molar number of manganese and nickel, respectively). The lithium transition metal oxide has a uniform and stable layered structure through control of oxidation number of transition metals to a level higher than +3, thus advantageously exerting improved overall electrochemical properties including electric capacity, in particular, superior high-rate charge/discharge characteristics.
    Type: Application
    Filed: July 9, 2010
    Publication date: June 16, 2011
    Applicant: LG CHEM, LTD.
    Inventors: Sung kyun CHANG, Hong-Kyu Park, Hyo-Shik Kil, Jin-hyung Lim
  • Publication number: 20110089367
    Abstract: Provided is a precursor for the preparation of a lithium transition metal oxide that is used for the preparation of a lithium transition metal oxide as a cathode active material for a lithium secondary battery, through a reaction with a lithium-containing compound, wherein the precursor contains two or more transition metals, and sulfate ion (SO4)-containing salt ions derived from a transition metal salt for the preparation of the precursor have a content of 0.1 to 0.7% by weight, based on the total weight of the precursor.
    Type: Application
    Filed: April 3, 2009
    Publication date: April 21, 2011
    Applicant: LG CHEM, LTD.
    Inventors: Ho Suk Shin, Sung Kyun Chang, Hong-Kyu Park, Sinyoung Park, Youngsun Choi, Seung Tae Hong, Hyo-Shik Kil
  • Publication number: 20100261060
    Abstract: Provided is an olivine-type lithium iron phosphate having a composition represented by Formula I, comprising 0.1 to 5% by weight of Li3PO4, and comprising no Li2CO3 or, if present, comprising Li2CO3 in an amount less than 0.25% by weight: Lii+aFe1?xMx(PO4?b)Xb (I) wherein M, X, a, x and b are as defined above. The lithium iron phosphate comprises no lithium carbonate (Li2CO3) or, if present, comprises the Li2CO3 in an extremely small amount, and comprises Li3PO4 having superior electrochemical stability, thermal stability and ionic conductivity, thus advantageously imparting high-temperature and storage stability as well as stability and rate properties to lithium secondary batteries, when used as a cathode active material for the lithium secondary batteries.
    Type: Application
    Filed: February 19, 2010
    Publication date: October 14, 2010
    Applicant: LG CHEM, LTD.
    Inventors: Sanghoon CHOY, Yong Tae Lee, Hong-Kyu Park, Soo Min Park, Hyo-shik Kil, Cheol-Hee Park
  • Publication number: 20100239909
    Abstract: Provided is a cathode mix for lithium secondary batteries, comprising a cathode active material having a composition represented by the following Formula I: LiFe(P1-XO4) (I) wherein a molar fraction (1-x) of phosphorus (P) is in the range of 0.910 to 0.999, to allow operational efficiency of the cathode active material to be leveled to a lower operational efficiency of an anode active material and improve energy density of the cathode active material. The cathode mix maximizes operational efficiency of batteries, minimizes electrode waste and thus reduces manufacturing costs of batteries. Furthermore, The cathode active material, wherein a molar fraction (1-x) of phosphorus (P) is lower than 1, according to the present invention contains both Fe2+ and Fe3+, thus advantageously causing no structural deformation, improving ionic conductivity, exhibiting superior rate properties, inhibiting IR drop upon charge/discharge, thereby imparting high energy density to batteries.
    Type: Application
    Filed: February 19, 2010
    Publication date: September 23, 2010
    Applicant: LG CHEM, LTD.
    Inventors: Sanghoon CHOY, Yong Tae LEE, Hong-Kyu PARK, Soo Min PARK, Hyo-Shik KIL, Cheol-Hee PARK
  • Patent number: 7745056
    Abstract: Disclosed herein is an electrolyte for lithium secondary batteries comprising: a chelating agent, which forms complexes with transition metal ions in the battery, and at the same time does not react and coordinate with lithium ions; a non-aqueous solvent; and an electrolyte salt, as well as a lithium secondary battery comprising the electrolyte. The chelating agent, which is contained in the electrolyte for lithium secondary batteries, can suppress a side reaction in which transition metal ions are reduced and deposited as transition metals on the anode. Also, the chelating agent can suppress internal short-circuits in the battery and the resulting voltage drop of the battery and a reduction in the safety and performance of the battery, which can occur when transition metals are deposited on the anode.
    Type: Grant
    Filed: December 1, 2006
    Date of Patent: June 29, 2010
    Assignee: LG Chem, Ltd.
    Inventors: Jae Hyun Lee, Soon Ho Ahn, Jong Hoa Ok, Seung Tae Hong, Jeong Min Kim, Jong Mo Jung, Hyo Shik Kil, Sung Hyup Lee
  • Publication number: 20100159321
    Abstract: Disclosed herein is an electrolyte for lithium secondary batteries comprising: a chelating agent, which forms complexes with transition metal ions in the battery, and at the same time does not react and coordinate with lithium ions; a non-aqueous solvent; and an electrolyte salt, as well as a lithium secondary battery comprising the electrolyte. The chelating agent, which is contained in the electrolyte for lithium secondary batteries, can suppress a side reaction in which transition metal ions are reduced and deposited as transition metals on the anode. Also, the chelating agent can suppress internal short-circuits in the battery and the resulting voltage drop of the battery and a reduction in the safety and performance of the battery, which can occur when transition metals are deposited on the anode.
    Type: Application
    Filed: March 8, 2010
    Publication date: June 24, 2010
    Applicant: LG CHEM LTD.
    Inventors: Jae Hyun LEE, Soon Ho AHN, Jong Hoa OK, Seung Tae HONG, Jeong Min KIM, Jong Mo JUNG, Hyo Shik KIL, Sung Hyup LEE
  • Publication number: 20080280211
    Abstract: Disclosed herein is an electrolyte for lithium secondary batteries comprising: a chelating agent, which forms complexes with transition metal ions in the battery, and at the same time does not react and coordinate with lithium ions; a non-aqueous solvent; and an electrolyte salt, as well as a lithium secondary battery comprising the electrolyte. The chelating agent, which is contained in the electrolyte for lithium secondary batteries, can suppress a side reaction in which transition metal ions are reduced and deposited as transition metals on the anode. Also, the chelating agent can suppress internal short-circuits in the battery and the resulting voltage drop of the battery and a reduction in the safety and performance of the battery, which can occur when transition metals are deposited on the anode.
    Type: Application
    Filed: December 1, 2006
    Publication date: November 13, 2008
    Applicant: LG CHEM LTD.
    Inventors: Jae Hyun Lee, Soon Ho Ahn, Jong Hoa Ok, Seung Tae Hong, Jeong Min Kim, Jong Mo Jung, Hyo Shik Kil, Sung Hyup Lee