Patents by Inventor Doo-kyung Yang

Doo-kyung Yang 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).

  • SULFUR-CARBON COMPOSITE, METHOD FOR PREPARING SAME AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20210184215
    Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur present in at least a part of pores of the porous carbon material and on an outer surface of the porous carbon material, wherein an inner surface and the outer surface of the porous carbon material are doped with a carbonate compound. Also, a positive electrode and a secondary battery including the same. Further, a method of preparing a sulfur-carbon composite and a method of preparing a positive electrode.
    Type: Application
    Filed: October 29, 2018
    Publication date: June 17, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Soohyun KIM, Kwonnam SOHN, Doo Kyung YANG
  • Binder for lithium-sulfur battery, positive electrode comprising same, and lithium-sulfur battery
    Patent number: 11038177
    Abstract: A binder for a lithium-sulfur battery, and a positive electrode and a lithium-sulfur battery including the same, and in particular, to a binder for a lithium-sulfur battery including lithium polyacrylate and polyvinyl alcohol. By including two types of specific polymers, the binder for a lithium-sulfur battery is capable of enhancing electrochemical properties and stability of a positive electrode, and thereby enhancing capacity and lifetime properties of a lithium-sulfur battery.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: June 15, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Hyunsoo Lee, Jong Mo Jung, Doo Kyung Yang, Yu Mi Kim, Seong Ho Lee, Gi Su Park, Byounghyo Jung
  • Method for preparing iron oxide-hydroxide (FeOOH) and positive electrode for lithium-sulfur battery comprising iron oxide-hydroxide
    Patent number: 11038174
    Abstract: A method for preparing Iron Oxide-hydroxide (FeOOH), and a positive electrode for a lithium-sulfur battery including Iron Oxide-hydroxide. In particular, the preparation of crystalline Iron Oxide-hydroxide, particularly, lepidocrocite (?-FeOOH), by controlling a reaction time and a reaction temperature, and by using the prepared high purity Iron Oxide-hydroxide in a positive electrode of a lithium-sulfur battery, may enhance discharge capacity and lifetime properties of the battery.
    Type: Grant
    Filed: May 28, 2018
    Date of Patent: June 15, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Suenghoon Han, Kwonnam Sohn, Doo Kyung Yang, Dongwook Lee, Jungmi Moon
  • Separator and lithium-sulfur battery comprising same
    Patent number: 11038241
    Abstract: A separator capable of simultaneously solving the problems caused by lithium polysulfides and lithium dendrites generated in a conventional lithium-sulfur battery wherein the separator includes a porous substrate alternately laminated with a graphene oxide layer and a boron nitride layer on at least one side thereof, and to a lithium-sulfur battery including the same.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: June 15, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Jieun Song, Kwonnam Sohn, Doo Kyung Yang, Yun Kyoung Kim
  • Carbon-sulfur complex, method for producing same, and cathode and lithium-sulfur battery comprising same
    Patent number: 11038194
    Abstract: A carbon-sulfur composite including a carbon aggregate and sulfur, a method for preparing the same, and a positive electrode and a lithium-sulfur battery including the same.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: June 15, 2021
    Assignees: LG CHEM, LTD., SOGANG UNIVERSITY RESEARCH FOUNDATION
    Inventors: Seungbo Yang, Eunkyung Cho, Jun Hyuk Moon, Kwonnam Sohn, Doo Kyung Yang, Donghee Gueon
  • LITHIUM SECONDARY BATTERY
    Publication number: 20210175505
    Abstract: A lithium secondary battery, and more particularly, to a lithium secondary battery having improved performance by minimizing the content of impurities such as sodium in the battery.
    Type: Application
    Filed: March 6, 2019
    Publication date: June 10, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Taek Gyoung KIM, Seung Yoon YANG, Eunji JANG, Doo Kyung YANG
  • Binder for positive electrode of lithium-sulfur secondary battery and method for preparing positive electrode using same
    Patent number: 11031598
    Abstract: A binder for a positive electrode of a lithium-sulfur secondary battery, including an acrylic polymer including an acrylic monomer polymerized unit, a non-acrylic monomer polymerized unit and a redox monomer polymerized unit, as well as a positive electrode active layer, a positive electrode and a lithium-sulfur secondary battery manufactured using the binder. The acrylic polymer contains at least 30 wt. % of the acrylic monomer polymerized unit.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: June 8, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Kyung Oh Kim, Choonghyeon Lee, Jeongae Yoon, Sujee Kwon, Doo Kyung Yang, Sung Soo Yoon
  • CATHODE SLURRY COMPOSITION, CATHODE MANUFACTURED USING SAME, AND BATTERY INCLUDING SAME
    Publication number: 20210167385
    Abstract: A positive electrode slurry composition, a positive electrode manufactured using the same, and a battery including the positive electrode. The positive electrode slurry composition includes a positive electrode active material, a binder, an alcohol, and water, wherein a content of the alcohol is in a range of 0.1 to 10% by weight, based on a total weight of the composition. The slurry composition for manufacturing a positive electrode has effects of highly improving the dispersibility of the positive electrode active material and the conductive material, decreasing the surface roughness of an electrode, and remarkably reducing a curling phenomenon in the electrode. Also, the slurry composition has an economic advantage in that a dispersing agent is not used or an amount of the dispersing agent used can be remarkably reduced.
    Type: Application
    Filed: January 11, 2019
    Publication date: June 3, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Jaegil LEE, Doo Kyung YANG, Yu Mi KIM, Yun Kyoung KIM, Eunkyung CHO
  • Electrode assembly having plurality of lithium metal sheets or lithium alloy sheets for lithium secondary battery, and lithium secondary battery and battery module including same
    Patent number: 11024886
    Abstract: The present invention relates to an electrode assembly for a lithium secondary battery, a lithium secondary battery and a battery module comprising the same, and in particular, to an electrode assembly for a lithium secondary battery capable of, by changing a form of a lithium negative electrode current collector and thereby minimizing an interface of the negative electrode current collector exposed to a electrolyte, fundamentally blocking a corrosion reaction focusing on the negative electrode current collector caused by the liquid electrolyte in the art, and a lithium secondary battery and a battery module including the same.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: June 1, 2021
    Assignee: LG CHEM, LTD.
    Inventors: In Tae Park, Doo Kyung Yang
  • SEPARATOR AND LITHIUM-SULFUR BATTERY COMPRISING THE SAME
    Publication number: 20210151833
    Abstract: A separator including a porous base and a coating layer on at least one surface of the porous base, the coating layer including (a) a carbon nanotube including an oxygen functional group and (b) a lithium ion conducting polymer, and a lithium-sulfur battery including the same. Such a separator may be capable of resolving problems caused by lithium polysulfide occurring in a lithium-sulfur battery.
    Type: Application
    Filed: October 11, 2018
    Publication date: May 20, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Jieun SONG, Doo Kyung YANG, Seungbo YANG
  • LITHIUM-SULFUR BATTERY
    Publication number: 20210143510
    Abstract: A lithium-sulfur battery comprising a separator in which an adsorption layer including a radical compound having a nitroxyl radical site is formed, and in particular, to a lithium-sulfur battery suppressing elution of lithium polysulfide by using an adsorption layer including a radical compound having a nitroxyl radical site and optionally a conductive material on at least one surface of a separator. In the lithium-sulfur battery, elution and diffusion may be prevented by a radical compound having a nitroxyl radical site, a stable radical compound, adsorbing lithium polysulfide eluted from positive electrode, and in addition thereto, electrical conductivity is further provided to provide a reaction site of a positive electrode active material, and as a result, battery capacity and lifetime properties are enhanced.
    Type: Application
    Filed: May 4, 2018
    Publication date: May 13, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Kihyun KIM, Soohyun KIM, Doo Kyung YANG, Sun Mi JIN, Changhoon LEE
  • METHOD FOR PREPROCESSING LITHIUM METAL FOR LITHIUM SECONDARY BATTERY
    Publication number: 20210104732
    Abstract: A method for pre-treating lithium metal for a lithium secondary battery including stripping a surface oxide film formed on a surface of the lithium metal by discharging the battery, and a plating lithium metal on the surface of the lithium metal, from which the surface oxide film has been stripped, by charging the battery.
    Type: Application
    Filed: July 16, 2019
    Publication date: April 8, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Intae PARK, Doo Kyung YANG, Jeehyun AHN
  • LITHIUM-SULFUR SECONDARY BATTERY
    Publication number: 20210104745
    Abstract: A lithium-sulfur secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolyte solution are provided. The positive electrode has an SC factor value of 0.45 or more. The electrolyte solution includes a solvent and a lithium salt, and the solvent includes a first solvent having a DV2 factor value of 1.7 or less, and a second solvent which is a fluorinated ether-based solvent.
    Type: Application
    Filed: October 24, 2019
    Publication date: April 8, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Intae PARK, Doo Kyung YANG, Youngcheol CHOI, Soohyun KIM, Changhoon LEE
  • LITHIUM SECONDARY BATTERY ELECTRODE COMPRISING LIOH, MANUFACTURING METHOD THEREFOR, AND LITHIUM SECONDARY BATTERY COMPRISING ELECTRODE
    Publication number: 20210098792
    Abstract: An electrode for a lithium secondary battery including LiOH, a method of manufacturing the same, and a lithium secondary battery including said electrode are provided. The electrode for a lithium secondary battery including LiOH is such that a SEI film is efficiently formed on the electrode surface.
    Type: Application
    Filed: September 17, 2019
    Publication date: April 1, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Eunkyung CHO, Doo Kyung YANG
  • CARBON-BASED FIBER SHEET AND LITHIUM-SULFUR BATTERY INCLUDING SAME
    Publication number: 20210098775
    Abstract: Disclosed is a carbon-based fiber sheet and a lithium-sulfur battery including the same. The carbon-based fiber sheet for the lithium-sulfur battery is doped with a high concentration of nitrogen and thus plays a role of preventing diffusion by adsorbing lithium polysulfide eluted from a positive electrode during charging and discharging, thereby suppressing a shuttle reaction and thus improving capacity and lifecycle properties of the lithium-sulfur battery.
    Type: Application
    Filed: December 8, 2020
    Publication date: April 1, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Yun Kyoung KIM, Taek Gyoung KIM, Kwonnam SOHN, Doo Kyung YANG, Mira IM
  • BINDER FOR LITHIUM-SULFUR SECONDARY BATTERY AND LITHIUM-SULFUR SECONDARY BATTERY INCLUDING SAME
    Publication number: 20210083292
    Abstract: A binder for a lithium-sulfur secondary battery and a lithium-sulfur secondary battery including the same. The binder includes a copolymer having a first polymerization unit derived from a first monomer and a second polymerization unit derived from a second monomer. The first monomer is alkyl acrylate having at least one functional group or alkyl methacrylate having at least one functional group. The second monomer is acrylic acid or methacrylic acid. The at least one functional group in the first monomer is a functional group having a single or repeated structure of a hydroxy group substituted or unsubstituted with alkyl having 1 to 4 carbon atoms, a thiol group substituted or unsubstituted with alkyl having 1 to 4 carbon atoms, or an amino group substituted or unsubstituted with alkyl having 1 to 4 carbon atoms. The second polymerization unit may have a lithiated form.
    Type: Application
    Filed: April 11, 2019
    Publication date: March 18, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Taek Gyoung KIM, Kyung Oh KIM, Doo Kyung YANG, Sung Soo YOON, Jeongae YOON
  • ELECTROLYTE FOR LITHIUM SECONDARY BATTERY AND LITHIUM-SECONDARY BATTERY INCLUDING THE SAME
    Publication number: 20210075062
    Abstract: An electrolyte for a lithium-secondary battery including a solvent, a lithium salt and an additive, wherein the additive includes a diamine-based compound, and a lithium-secondary battery including the same.
    Type: Application
    Filed: September 21, 2018
    Publication date: March 11, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Seung Yoon YANG, Dongwook KOH, Doo Kyung YANG
  • Electrolyte for lithium-sulfur battery and lithium-sulfur battery comprising same
    Patent number: 10930975
    Abstract: The present invention relates to a ternary liquid electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same. The liquid electrolyte for a lithium-sulfur battery according to the present invention exhibits an excellent sulfur utilization rate when used in a lithium-sulfur battery, and exhibits excellent stability. Accordingly, the liquid electrolyte for a lithium-sulfur battery according to the present invention is capable of enhancing a life time property while securing a capacity property of a lithium-sulfur battery.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: February 23, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Intae Park, Sungwon Hong, Charles Kiseok Song, Youhwa Ohk, Doo Kyung Yang, Changhoon Lee
  • Electrolyte solution for lithium-sulfur battery and lithium-sulfur battery comprising same
    Patent number: 10923759
    Abstract: The present invention relates to a ternary liquid electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same. The liquid electrolyte for a lithium-sulfur battery according to the present invention exhibits an excellent sulfur utilization rate when used in a lithium-sulfur battery, and exhibits excellent stability. Accordingly, the liquid electrolyte for a lithium-sulfur battery according to the present invention is capable of enhancing a life time property while securing a capacity property of a lithium-sulfur battery.
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: February 16, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Intae Park, Sungwon Hong, Charles Kiseok Song, Youhwa Ohk, Doo Kyung Yang, Changhoon Lee
  • Lithium-sulfur battery including polymer non-woven fabric between positive electrode and separator
    Patent number: 10923699
    Abstract: A lithium-sulfur battery is provided. More specifically, a lithium-sulfur battery including a polymer non-woven fabric containing a liquid electrolyte between a positive electrode including sulfur and a separator is provided. By including a polymer non-woven fabric containing a liquid electrolyte between a positive electrode and a separator, the lithium-sulfur battery according to the present invention is capable of continuously supplying the liquid electrolyte to the positive electrode, and suppressing polysulfide elution. Accordingly, the lithium-sulfur battery has a reduced discharge overvoltage, and exhibits excellent discharge capacity and life time properties.
    Type: Grant
    Filed: July 6, 2017
    Date of Patent: February 16, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Taek Gyoung Kim, Doo Kyung Yang, Intae Park