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 PRODUCING SAME, AND LITHIUM SECONDARY BATTERY INCLUDING SAME
    Publication number: 20210020940
    Abstract: Discussed is a sulfur-carbon composite, a method for preparing the same, and a positive electrode for a lithium secondary battery and a lithium secondary battery including the same.
    Type: Application
    Filed: September 2, 2019
    Publication date: January 21, 2021
    Applicants: LG CHEM, LTD., POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Dongwook LEE, Jinwoo LEE, Wongwang LIM, Kwonnam SOHN, Doo Kyung YANG, Jia LEE
  • Sulfur-carbon composite and lithium-sulfur battery comprising same
    Patent number: 10886530
    Abstract: A sulfur-carbon composite and a lithium-sulfur battery including the same, and in particular, to a sulfur-carbon composite comprising a porous carbon material; and sulfur on at least a part of an inside and outside surface of the porous carbon material, wherein the inside and outside surface of the porous carbon material include a coating layer comprising an ion conducting polymer, and a lithium-sulfur battery including the same. Also provided is an ion conducting polymer coating layer on a porous carbon material surface which thereby improves a lithium ion conducting property to a positive electrode, and as a result, may enhance capacity and life time properties of a lithium-sulfur battery.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 5, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Eunkyung Cho, Doo Kyung Yang, Dongwook Koh
  • SEPARATOR FOR LITHIUM-SULFUR BATTERY AND LITHIUM-SULFUR BATTERY INCLUDING SAME
    Publication number: 20200395586
    Abstract: A separator for a lithium-sulfur battery and a lithium-sulfur battery including the same is provided. More particularly, a separator for a lithium-sulfur battery including a porous substrate; and a coating layer present on at least one surface of the porous substrate, wherein the coating layer includes a polymer and a graphitic carbon-based compound, wherein the polymer includes a main chain with a functional group having a non-covalent electron pair present in the main chain and a side chain with an aromatic hydrocarbon group present in the side chain.
    Type: Application
    Filed: May 8, 2019
    Publication date: December 17, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Kihyun KIM, Seungbo YANG, Jieun SONG, Dongseok SHIN, Doo Kyung YANG, Soohyun KIM
  • SEPARATION MEMBRANE AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200388809
    Abstract: A separator in which at least one surface of a porous base is coated with a coating layer including partially-reduced graphene oxide and a lithium ion conducting polymer, and thereby capable of resolving problems caused by lithium polysulfide occurring in a lithium secondary battery, and a lithium secondary battery including the same.
    Type: Application
    Filed: October 8, 2018
    Publication date: December 10, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Jieun SONG, Kwonnam SOHN, Doo Kyung YANG
  • Secondary battery including electrolyte additive
    Patent number: 10862165
    Abstract: Disclosed is a secondary battery including an electrode assembly, which includes a cathode, an anode and a separator interposed therebetween, and an electrolyte, wherein the anode includes lithium titanium oxide (LTO) as an anode active material and the electrolyte contains a phosphate-based compound as an additive.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: December 8, 2020
    Inventors: Kyoung-Ho Ahn, Chul-Haeng Lee, Doo-Kyung Yang, Jong-Ho Jeon, Yoo-Seok Kim, Min-Jung Kim, Jung-Hoon Lee, Yi-Jin Jung
  • Sulfide-based solid electrolyte and all-solid-state battery applied therewith
    Patent number: 10854912
    Abstract: The present invention relates to a solid electrolyte comprising a sulfide-based compound and an all-solid-state battery applied therewith and, more particularly, to a solid electrolyte comprising a sulfide-based compound that is free of phosphorus (P) element but exhibits high ionic conductivity, and an all-solid-state battery applied therewith. The sulfide-based solid electrolyte and the all-solid-state battery applied therewith according to the present invention exhibit improved reactivity to moisture to prevent the generation of toxic gas, resulting in an improvement in safety and stability and do not reduce in ion conductivity even after being left in air, and the solid electrolyte is easy to handle and store thanks to the improved shelf stability thereof.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: December 1, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Da Young Sung, Chan Yeup Chung, Su Hwan Kim, Jong Hyun Chae, Doo Kyung Yang
  • BINDER FOR MANUFACTURING POSITIVE ELECTRODE OF LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING POSITIVE ELECTRODE BY USING SAME
    Publication number: 20200373579
    Abstract: A binder for preparing a positive electrode of a lithium secondary battery, and a method for preparing a positive electrode using the same. The binder includes two or more different lithium-substituted polyacrylic acids with different molecular weights. The lithium-substituted polyacrylic acids include two different lithium-substituted polyacrylic acids differing in weight average molecular weight by 500,000 or more from each other.
    Type: Application
    Filed: November 16, 2018
    Publication date: November 26, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Choonghyeon LEE, Doo Kyung YANG, Taek Gyoung KIM, Joo Hyeong LEE
  • Pretreatment method for lithium electrode, and lithium metal battery
    Patent number: 10840541
    Abstract: A method for pretreating a lithium electrode, and a lithium metal battery, and in particular, a method for stabilizing a lithium electrode through pretreatment of being immersed in a composition for forming a solid electrolyte interphase, and a lithium metal battery including such a lithium electrode. Effects of decreasing interfacial resistance and enhancing Li charge and discharge efficiency are obtained when forming a solid electrolyte interphase (SEI) on a lithium electrode in advance using a pretreatment process of the lithium electrode, and then using the SEI layer-formed lithium electrode in a lithium metal battery.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: November 17, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Jieun Song, Doo Kyung Yang
  • CATHODE FOR LITHIUM SECONDARY BATTERIES AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20200350570
    Abstract: A cathode for lithium secondary batteries including a gel polymer electrolyte coating layer formed on a cathode active material layer of a lithium secondary battery, and more particularly, a cathode having a novel structure capable of solving problems caused due to lithium polysulfides, the problems being caused in conventional lithium secondary batteries, and a lithium secondary battery including the same and method for preparing the same.
    Type: Application
    Filed: October 23, 2018
    Publication date: November 5, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Yun Kyoung KIM, Dongwook KOH, Doo Kyung YANG
  • Lithium secondary battery
    Patent number: 10826063
    Abstract: The present invention may improve the lifetime characteristics of a lithium secondary battery, and particularly, may provide a non-aqueous electrolyte solution or cathode including a phosphate-based compound which may exhibit stable and excellent lifetime characteristics at high temperature and high voltage regardless of the moisture content or the presence of a pressing process of the electrode.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: November 3, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Sung Hoon Yu, Kyung Mi Lee, Doo Kyung Yang, Yoo Sun Kang, Jung Hoon Lee
  • CERIA-CARBON-SULFUR COMPOSITE, METHOD FOR PREPARING SAME, AND POSITIVE ELECTRODE AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200343535
    Abstract: A ceria-carbon-sulfur (CeO2—C—S) composite including a ceria-carbon (CeO2—C) composite in which cylindrical carbon materials having ceria (CeO2) particles bonded to surfaces thereof are entangled and interconnected to each other in three dimensions; and sulfur introduced into at least a portion of an outer surface and an inside of the ceria-carbon composite, a method for preparing the same, and positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same.
    Type: Application
    Filed: March 13, 2019
    Publication date: October 29, 2020
    Applicants: LG CHEM, LTD., SOGANG UNIVERSITY RESEARCH FOUNDATION
    Inventors: Seungbo YANG, Kwonnam SOHN, Jun Hyuk MOON, Doo Kyung YANG, Donghee GUEON, Jeong Tae HWANG
  • SEPARATOR FOR LITHIUM-SULFUR BATTERY AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200335762
    Abstract: A separator for a lithium-sulfur battery and a lithium-sulfur battery including the same are provided. More particularly, a separator for a lithium-sulfur battery including a porous substrate; and a coating layer present on at least one surface of the porous substrate, wherein the coating layer includes a polymer including a main chain, with a functional group having a non-covalent electron pair present in the main chain and a side chain with an aromatic hydrocarbon group present in the side chain.
    Type: Application
    Filed: May 8, 2019
    Publication date: October 22, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Kihyun KIM, Kwonnam SOHN, Dongseok SHIN, Doo Kyung YANG
  • SEPARATOR AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME
    Publication number: 20200328391
    Abstract: A separator in which at least one side of a porous substrate has thereon a coating layer containing a partially reduced graphene oxide with a sheet shape and a lithium ion conductivity polymer, which can solve the problem caused by the lithium polysulfide which occurs in the conventional lithium secondary battery, and a lithium secondary battery.
    Type: Application
    Filed: October 8, 2018
    Publication date: October 15, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Jieun SONG, Kwonnam SOHN, Doo Kyung YANG
  • SEPARATOR AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200328394
    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: Application
    Filed: December 21, 2017
    Publication date: October 15, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Jieun SONG, Kwonnam SOHN, Doo Kyung YANG, Yun Kyoung KIM
  • Electrolyte for lithium-sulfur battery and lithium-sulfur battery comprising same
    Patent number: 10804576
    Abstract: The present invention relates to an electrolyte solution for a lithium-sulfur battery and a lithium-sulfur battery including the same. The electrolyte solution for a lithium-sulfur battery according to the present invention exhibits excellent stability, and may improve a swelling phenomenon by suppressing gas generation during lithium-sulfur battery operation.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: October 13, 2020
    Assignee: LG CHEM, LTD.
    Inventors: In Tae Park, Sung Won Hong, Charles Kiseok Song, Chang Hoon Lee, Doo Kyung Yang
  • Self-assembled composite of carbon nitride and graphene oxide, manufacturing method for same, positive electrode having same applied thereto, and lithium-sulfur battery comprising same
    Patent number: 10804538
    Abstract: The present invention relates to a self-assembled composite of carbon nitride and graphene oxide, and in particular, to including a self-assembled composite prepared by heat treating a mixed solution dissolving melamine, tri-thiocyanuric acid and graphene oxide (GO) in a positive electrode of a lithium-sulfur battery to suppress elution of lithium polysulfide. According to the present invention, the self-assembled composite containing a pyridinic group in large quantities and having improved conductivity adsorbs lithium polysulfide eluted from a positive electrode during charge and discharge and performs a role of preventing diffusion of the lithium polysulfide, and therefore, lithium-sulfur battery capacity and lifecycle properties can be enhanced by suppressing a shuttle reaction.
    Type: Grant
    Filed: January 25, 2017
    Date of Patent: October 13, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Ji Hee Park, Kwon Nam Sohn, Doo Kyung Yang, Ki Young Kwon
  • SEPARATOR AND LITHIUM-SULFUR BATTERY COMPRISING SAME
    Publication number: 20200321579
    Abstract: A separator capable of simultaneously solving the problems caused by lithium polysulfide and lithium dendrite generated in a conventional lithium-sulfur battery wherein the separator includes a porous substrate coated with graphene oxide and boron nitride on at least one side, and a lithium-sulfur battery including the same.
    Type: Application
    Filed: December 21, 2017
    Publication date: October 8, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Jieun SONG, Kwonnam SOHN, Doo Kyung YANG, Yun Kyoung KIM
  • BINDER FOR PREPARING POSITIVE ELECTRODE FOR LITHIUM-SULFUR SECONDARY BATTERY, AND METHOD FOR PREPARING POSITIVE ELECTRODE USING SAME
    Publication number: 20200299444
    Abstract: A binder for preparing a positive electrode of a lithium-sulfur secondary battery, a composition including the binder, a positive electrode including the composition and a lithium-sulfur secondary battery including the positive electrode. The binder includes an acrylic polymer, and the acrylic polymer includes a unit formed from a hydroxyphenyl-based monomer or a disulfide-based monomer. The acrylic polymer may include 1 to 20 wt. % of units formed from the hydroxyphenyl-based monomer. The acrylic polymer may include 1 to 20 wt. % of units formed from the disulfide-based monomer. Such a battery has increased long-term stability due to suppression of leaching of the sulfur-based materials by absorption of lithium polysulfides.
    Type: Application
    Filed: September 18, 2018
    Publication date: September 24, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Choonghyeon LEE, Kyung Oh KIM, Doo Kyung YANG, Sung Soo YOON
  • POROUS CARBON, AND POSITIVE ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20200295354
    Abstract: Porous carbon particles, and a positive electrode active material and a lithium secondary battery including the same. This may improve the energy density of the lithium secondary battery by applying a porous electrode containing micropores and mesopores and having a uniform size distribution and shape as a positive electrode material.
    Type: Application
    Filed: October 19, 2018
    Publication date: September 17, 2020
    Applicants: LG CHEM, LTD., POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Dongwook LEE, Changshin JO, Jinwoo LEE, Kwonnam SOHN, Doo Kyung YANG, Won-Gwang LIM
  • BINDER FOR LITHIUM-SULFUR BATTERY, POSITIVE ELECTRODE COMPRISING SAME, AND LITHIUM-SULFUR BATTERY
    Publication number: 20200287219
    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: Application
    Filed: December 19, 2018
    Publication date: September 10, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Hyunsoo LEE, Jong Mo JUNG, Doo Kyung YANG, Yu Mi KIM, Seong Ho LEE, Gi Su PARK, Byounghyo JUNG