Patents by Inventor Hera LEE
Hera LEE 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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Publication number: 20150218394Abstract: The present application relates to a method for manufacturing a printed matter, the method including: coating an ink layer on a substrate; and forming a printing pattern layer on the substrate by bringing a printing plate in contact with the ink layer to remove a portion other than a desired pattern from the ink layer. The manufacturing method of the present application is effective in reducing costs because the precision of the printing pattern is excellent and the manufacturing process is simple.Type: ApplicationFiled: August 2, 2013Publication date: August 6, 2015Applicant: LG CHEM, LTD.Inventors: Dae Hyun Kim, Seung Heon Lee, Jooyeon Kim, Mihee Park, U Ra Lee, Wonjoo Lee, Hera Lee
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Patent number: 8974970Abstract: 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: 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: GrantFiled: June 19, 2014Date of Patent: March 10, 2015Assignee: LG Chem, Ltd.Inventors: Sung-Kyun Chang, Hong-Kyu Park, Sinyoung Park, Hyo-shik Kil, Hera Lee
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Publication number: 20140299813Abstract: 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: 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: ApplicationFiled: June 19, 2014Publication date: October 9, 2014Inventors: Sung-Kyun CHANG, Hong-Kyu PARK, Sinyoung PARK, Hyo-shik KIL, Hera LEE
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Patent number: 8790832Abstract: 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: 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: GrantFiled: April 8, 2013Date of Patent: July 29, 2014Assignee: LG Chem, Ltd.Inventors: Sung-Kyun Chang, Hong-Kyu Park, Sinyoung Park, Hyo-shik Kil, Hera Lee
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Publication number: 20130234064Abstract: 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: 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: ApplicationFiled: April 8, 2013Publication date: September 12, 2013Applicant: LG CHEM, LTD.Inventors: Sung kyun CHANG, Hong-Kyu PARK, Sinyoung PARK, Hyo-shik KIL, Hera LEE
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Patent number: 8440354Abstract: 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: GrantFiled: February 25, 2011Date of Patent: May 14, 2013Assignee: LG Chem, Ltd.Inventors: Sung kyun Chang, Hong-Kyu Park, Sinyoung Park, Hyo-shik Kil, Hera Lee
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Publication number: 20110315917Abstract: 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: ApplicationFiled: February 25, 2011Publication date: December 29, 2011Applicant: LG CHEM, LTD.Inventors: Sung kyun CHANG, Hong-Kyu PARK, Sinyoung PARK, Hyo-shik KIL, Hera LEE