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).

  • Patent number: 11978886
    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: Grant
    Filed: July 16, 2019
    Date of Patent: May 7, 2024
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Intae Park, Doo Kyung Yang, Jeehyun Ahn
  • Publication number: 20240120566
    Abstract: The present disclosure relates to a method of recycling a positive electrode active material and a recycled positive electrode active material prepared by the same. More particularly, the present disclosure relates to a method of recycling a positive electrode active material, the method including step A of fragmenting a waste battery including a positive electrode, a separator, and a negative electrode to form waste battery scraps; step B of removing the negative electrode by jetting compressed air onto the waste battery scraps; and step C of treating the waste battery scraps from which the negative electrode has been removed with a solvent to remove the separator and obtain positive electrode scraps, and a recycled positive electrode active material prepared by the method.
    Type: Application
    Filed: August 22, 2022
    Publication date: April 11, 2024
    Inventors: Min Seo KIM, Doo Kyung YANG, Se Ho PARK, Jeongbae LEE, Eunkyu SEONG, Yongsik SEO
  • Publication number: 20240106020
    Abstract: Provided is a method for recovering and reusing an active material from a positive electrode scrap.
    Type: Application
    Filed: August 1, 2022
    Publication date: March 28, 2024
    Inventors: Eun-Kyu SEONG, Min-Seo KIM, Se-Ho PARK, Yong-Sik SEO, Doo-Kyung YANG, Jeong-Bae LEE
  • Patent number: 11923538
    Abstract: A negative electrode for a lithium secondary battery including a lithium metal layer; a first protective layer formed on a surface of the lithium metal layer; and a second protective layer formed on a surface of the first protective layer opposite the lithium metal layer, wherein the first protective layer and the second protective layer are different from each other in at least one property selected from the group consisting of ion conductivity and electrolyte uptake.
    Type: Grant
    Filed: November 23, 2022
    Date of Patent: March 5, 2024
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Dongwook Koh, Doo Kyung Yang
  • Publication number: 20240055597
    Abstract: A method of recycling a positive electrode active material and a recycled positive electrode active material prepared by the method. The method includes the steps of recovering a positive electrode active material by heat-treating a waste positive electrode comprising a current collector and a positive electrode active material layer coated thereon at 300 to 650° C. in air, washing the recovered positive electrode active material with water containing an ionic solid salt, and adding a lithium precursor to the washed recovered positive electrode active material and performing annealing at 400 to 1,000° C. in air.
    Type: Application
    Filed: August 24, 2022
    Publication date: February 15, 2024
    Inventors: Jeongbae LEE, Doo Kyung YANG, Min Seo KIM, Se Ho PARK, Eunkyu SEONG, Yongsik SEO
  • Patent number: 11901528
    Abstract: There is provided a method for collecting and reusing an active material from positive electrode scrap. The method for reusing a positive electrode active material of the present disclosure includes (a) thermally treating positive electrode scrap comprising an active material layer on a current collector in air for thermal decomposition of a binder and a conductive material in the active material layer, to separate the current collector from the active material layer, and collecting an active material in the active material layer, (b-1) washing the active material collected from the step (a) with a lithium compound solution which is basic in an aqueous solution, (b-2) mixing the active material washed from the step (b-1) with a lithium precursor aqueous solution and spray drying, and (c) annealing the active material spray dried from the step (b-2) to obtain a reusable active material.
    Type: Grant
    Filed: January 15, 2021
    Date of Patent: February 13, 2024
    Assignee: LG Energy Solution, Ltd.
    Inventors: Min-Seo Kim, Se-Ho Park, Doo-Kyung Yang
  • Publication number: 20240047652
    Abstract: A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 2500 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.
    Type: Application
    Filed: October 19, 2023
    Publication date: February 8, 2024
    Applicants: LG ENERGY SOLUTION, LTD., INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Eunkyung CHO, Suenghoon HAN, Myeong Jun SONG, Il To KIM, Kwonnam SOHN, Doo Kyung YANG, Jiwon KIM, Moo Whan SHIN
  • Publication number: 20240039070
    Abstract: The present disclosure relates to a method of recycling a positive electrode active material and a recycled positive electrode active material prepared by the same. More particularly, the present disclosure relates to a method of recycling a positive electrode active material, the method including step A of recovering a positive electrode active material by heat-treating a waste positive electrode including a current collector and a positive electrode active material layer coated thereon at 300 to 650° C. in air; step B of precipitating the recovered positive electrode active material in a basic aqueous lithium compound solution for 10 to 40 minutes; step C of removing a supernatant after the precipitation step and obtaining a precipitate; and step D of adding a lithium precursor to the obtained precipitate and performing annealing at 400 to 1,000° C. in air and a recycled positive electrode active material prepared by the method.
    Type: Application
    Filed: July 22, 2022
    Publication date: February 1, 2024
    Inventors: Se Ho PARK, Yongsik SEO, Doo Kyung YANG, Min Seo KIM, Jeongbae LEE, Eunkyu SEONG
  • Publication number: 20240038989
    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: April 6, 2023
    Publication date: February 1, 2024
    Applicant: LG ENERGY SOLUTION, LTD.
    Inventors: Soohyun KIM, Kwonnam SOHN, Doo Kyung YANG
  • Publication number: 20240021803
    Abstract: A sulfur-carbon composite including a porous carbon material; and sulfur coated on at least a portion of an inside and a surface of the porous carbon material, wherein a pore volume of the sulfur-carbon composite is 0.04 to 0.400 cm3/g and a specific surface area of the sulfur-carbon composite is 4.0 to 30 m2/g, and a method for preparing the same.
    Type: Application
    Filed: April 11, 2023
    Publication date: January 18, 2024
    Applicant: LG ENERGY SOLUTION, LTD.
    Inventors: Eui Tae KIM, Suenghoon HAN, Kwonnam SOHN, Doo Kyung YANG
  • Patent number: 11848448
    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: Grant
    Filed: March 6, 2019
    Date of Patent: December 19, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Taek Gyoung Kim, Seung Yoon Yang, Eunji Jang, Doo Kyung Yang
  • Patent number: 11831010
    Abstract: A carbon-sulfur composite including a carbonized metal-organic framework (MOF); and a sulfur compound introduced to at least a part of an outside surface and an inside of the carbonized metal-organic framework, wherein the carbonized metal-organic framework has a specific surface area of 2500 m2/g to 4000 m2/g, and the carbonized metal-organic framework has a pore volume of 0.1 cc/g to 10 cc/g, and a method for preparing the same.
    Type: Grant
    Filed: October 12, 2022
    Date of Patent: November 28, 2023
    Assignees: LG ENERGY SOLUTION, LTD., INDUSTRY-ACADEMIC COOPERATION FOUNDATION, YONSEI UNIVERSITY
    Inventors: Eunkyung Cho, Suenghoon Han, Myeong Jun Song, Il To Kim, Kwonnam Sohn, Doo Kyung Yang, Jiwon Kim, Moo Whan Shin
  • Patent number: 11811049
    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: Grant
    Filed: December 8, 2020
    Date of Patent: November 7, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Yun Kyoung Kim, Taek Gyoung Kim, Kwonnam Sohn, Doo Kyung Yang, Mira Im
  • Patent number: 11811018
    Abstract: A positive electrode for a lithium-sulfur battery and a lithium-sulfur battery including the same, and in particular, a positive electrode for a lithium-sulfur battery including an active material, a conductive material, a binder and an additive, wherein the additive includes an organic acid lithium salt, the organic acid lithium salt including a dicarboxyl group. By including a dicarboxyl group-including organic acid lithium salt as the additive, the positive electrode for the lithium-sulfur battery is capable of enhancing capacity and lifetime properties of the lithium-sulfur battery through enhancing lithium ion migration properties.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: November 7, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Yun Kyoung Kim, Doo Kyung Yang, Seung Yoon Yang
  • Patent number: 11795063
    Abstract: A titania-carbon-sulfur composite including a titania-carbon composite prepared by mixing cylindrical carbon materials and titania (TiO2-x), in which some oxygen is reduced (i.e., x is less than 2), to have a structure in which cylindrical carbon materials are entangled and interconnected in three dimensions; and sulfur introduced into at least a part of the external surface and inside of the titania-carbon (TiO2—C) composite, and a method for preparing the same.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: October 24, 2023
    Assignees: LG ENERGY SOLUTION, LTD., SOGANG UNIVERSITY RESEARCH FOUNDATION
    Inventors: Seungbo Yang, Eunkyung Cho, Jun Hyuk Moon, Kwonnam Sohn, Doo Kyung Yang, Jaehyun Lee, Donghee Gueon
  • Publication number: 20230327226
    Abstract: An active material recovery apparatus includes a heat treatment bath and a screening wall extending along a first axis. The heat treatment bath includes a heating zone and the screening wall includes a cooling zone. The active material recovery apparatus includes an exhaust injection and a degassing system. The heat treatment bath is configured to remove a binder and a conductive material in an active material layer and to perform heat treatment in air on an electrode scrap including the active material layer on a current collector. The screen wall is configured to recover the active material in powder form. The active material recovery apparatus is configured to separately recover the current collector that does not pass through the screening wall. The heat treatment bath includes protrusions in a sawtooth shape on a first cross-section orthogonal to the first axis.
    Type: Application
    Filed: July 1, 2021
    Publication date: October 12, 2023
    Inventors: Min-Seo KIM, Se-Ho PARK, Doo-Kyung YANG
  • Patent number: 11780945
    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: Grant
    Filed: September 18, 2018
    Date of Patent: October 10, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Choonghyeon Lee, Kyung Oh Kim, Doo Kyung Yang, Sung Soo Yoon
  • Patent number: 11777091
    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: Grant
    Filed: January 11, 2019
    Date of Patent: October 3, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Jaegil Lee, Doo Kyung Yang, Yu Mi Kim, Yun Kyoung Kim, Eunkyung Cho
  • Publication number: 20230275278
    Abstract: A method of recovering an active material from a positive electrode scrap and reusing the active material is provided.
    Type: Application
    Filed: June 29, 2021
    Publication date: August 31, 2023
    Inventors: Min-Seo KIM, Se-Ho PARK, Doo-Kyung YANG
  • Patent number: 11742513
    Abstract: A separator for lithium-sulfur batteries and a lithium-sulfur battery including the same. The separator for lithium-sulfur batteries includes a separator substrate, a first coating layer formed on at least one surface of the separator substrate, and a second coating layer formed on the first coating layer. The first coating layer includes a polydopamine, and the second coating layer includes a lithium-substituted water-soluble polymer. Also a method for preparing the separator.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: August 29, 2023
    Assignee: LG ENERGY SOLUTION, LTD.
    Inventors: Sunjin Kim, Dongseok Shin, Doo Kyung Yang