Patents by Inventor Jung Keun YOO

Jung Keun YOO 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).

  • Publication number: 20210104338
    Abstract: A method for producing a composite conductive material having excellent dispersibility is provided. The method includes supporting a catalyst on surfaces of carbon particles; heat treating the catalyst in a helium or hydrogen atmosphere such that the catalyst penetrate the surfaces of the carbon particles and are impregnated beneath the surfaces of the carbon particles at a contact point between the carbon particles and the impregnated catalyst; and heating the carbon particles having the impregnated catalyst disposed therein in the presence of a source gas to grow carbon nanofibers from the impregnated catalyst to form a composite conductive material, wherein the source gas contains a carbon source, and wherein the carbon nanofibers extend from the contact point to above the surfaces of the carbon particles.
    Type: Application
    Filed: December 9, 2020
    Publication date: April 8, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Tea Gon Kim, Je Young Kim, Hak Yoon Kim, Ki Won Sung, Ye Lin Kim, Joo Yul Baek, Jung Keun Yoo, Jun Muk Lim, Seul Ki Kim
  • Patent number: 10902968
    Abstract: The present invention provides a composite conductive material having excellent dispersibility and a method for producing the same. In an embodiment, the method includes supporting a catalyst on surfaces of carbon particles; heat treating the catalyst in a helium or hydrogen atmosphere such that the catalyst penetrate the surfaces of the carbon particles and are impregnated beneath the surfaces of the carbon particles at a contact point between the carbon particles and the impregnated catalyst; and heating the carbon particles having the impregnated catalyst disposed therein in the presence of a source gas to grow carbon nanofibers from the impregnated catalyst to form a composite conductive material, wherein the source gas contains a carbon source, and wherein the carbon nanofibers extend from the contact point to above the surfaces of the carbon particles.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: January 26, 2021
    Inventors: Tea Gon Kim, Je Young Kim, Hak Yoon Kim, Ki Won Sung, Ye Lin Kim, Joo Yul Baek, Jung Keun Yoo, Jun Muk Lim, Seul Ki Kim
  • Publication number: 20210005895
    Abstract: A conductive agent, a slurry for forming an electrode, the slurry including the same, an electrode manufactured using the same, and a lithium secondary battery are provided. The conductive agent includes graphene flakes the maximum peak of which is observed in a range of 24.5° to 26° of 2? in a data graph obtained by a X-Ray Diffraction (XRD) analysis, wherein the aspect ratio of the average lateral size of the surfaces of the graphene flakes to the average thickness of the graphene flakes in a direction perpendicular to surfaces of the graphene flakes is 500 to 50,000.
    Type: Application
    Filed: January 28, 2019
    Publication date: January 7, 2021
    Applicants: LG Chem, Ltd., Korea Advanced Institute Of Science And Technology
    Inventors: Tae Gon Kim, Seul Ki Kim, Je Young Kim, Jung Keun Yoo, Seok Woo Jeon, Jung Mo Kim
  • Patent number: 10857524
    Abstract: The carbon nanotubes according to the present invention can provide higher conductivity by allowing the BET and crystal size to satisfy the conditions expressed by formula 1 below, and consequently, can improve the conductivity of a carbon composite material containing the carbon nanotubes. Lc×[Specific surface area of CNT (cm2/g)]1/2>80??[Formula 1] wherein, Lc is crystal size measured by X-ray diffraction.
    Type: Grant
    Filed: March 21, 2017
    Date of Patent: December 8, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Kyung Yeon Kang, Yelin Kim, Jihee Woo, Jung Keun Yoo, Dong Hyun Cho
  • Patent number: 10727477
    Abstract: The present invention provides a conductive material dispersed liquid, including: a conductive material which includes bundle-type carbon nanotubes; a dispersant; a dispersion medium, where a phase angle is in a range of 3° to 18° when measured by a rheometer at a frequency of 1 Hz; and a lithium secondary battery manufactured using the conductive material dispersed liquid. The conductive material dispersed liquid has high solid-like properties, and thus allows the formation of an electrode active material layer having a uniform thickness with no concern for collapse or occurrence of cracks during manufacture of an electrode, and thereby can improve the performance characteristics, particularly capacity characteristics, of a battery.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: July 28, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Ye Lin Kim, Ki Yeon Jo, Jung Keun Yoo, Je Young Kim, Sang Hoon Choy, Jong Heon Seol
  • Publication number: 20200126684
    Abstract: The present invention provides a composite conductive material having excellent dispersibility and a method for producing the same. In an embodiment, the method includes supporting a catalyst on surfaces of carbon particles; heat treating the catalyst in a helium or hydrogen atmosphere such that the catalyst penetrate the surfaces of the carbon particles and are impregnated beneath the surfaces of the carbon particles at a contact point between the carbon particles and the impregnated catalyst; and heating the carbon particles having the impregnated catalyst disposed therein in the presence of a source gas to grow carbon nanofibers from the impregnated catalyst to form a composite conductive material, wherein the source gas contains a carbon source, and wherein the carbon nanofibers extend from the contact point to above the surfaces of the carbon particles.
    Type: Application
    Filed: June 8, 2018
    Publication date: April 23, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Tea Gon Kim, Je Young Kim, Hak Yoon Kim, Ki Won Sung, Ye Lin Kim, Joo Yul Baek, Jung Keun Yoo, Jun Muk Lim, Seul Ki Kim
  • Patent number: 10516160
    Abstract: An electrode for a lithium secondary battery includes a current collector, primer layer formed on a side of the current collector and includes a first conductive agent, a first binder and a first dispersant. Further, an active material layer is formed on a side of the primer layer disposed opposite to the current collector and includes an active material. Additionally, the lithium secondary battery includes a positive electrode, a negative electrode or both, a separator disposed between the positive electrode and the negative electrode and an electrolyte. The structural stability and adhesion of the electrode is improved, a ratio of a binder in the active material layer is reduced and the internal resistance is reduced.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: December 24, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Seul Ki Kim, Jong Heon Seol, Hee Soo Na, Chan Sub Lee, Hyung Suk Cho, Jung Keun Yoo, Je Young Kim
  • Patent number: 10516154
    Abstract: Disclosed is a positive electrode for a lithium secondary battery which uses a positive electrode active material containing secondary particles with a relatively weak particle strength to improve the adhesion between a positive electrode mixture layer and a current collector, and the positive electrode includes a positive electrode current collector; a primer coating layer including a first polymer binder and a first conductive material, having surface roughness (Ra) of 85 nm to 300 nm and formed on at least one surface of the positive electrode current collector; and a positive electrode mixture layer formed on an upper surface of the primer coating layer and including a positive electrode active material containing secondary particles with a compressive breaking strength of 1 to 15 MPa, a second polymer binder and a second conductive material.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: December 24, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Jong-Heon Seol, Jin-Young Son, Hyung-Suk Cho, Sin-Young Jung, Yoon-Jung Choi, Yo-Jin Kim, Je-Young Kim, Sung-Joon Park, Jung-Keun Yoo, Sang-Hoon Choy
  • Publication number: 20190312259
    Abstract: A positive electrode for a lithium secondary battery includes a positive electrode current collector; a lower positive electrode active material layer disposed on at least one surface of the positive electrode current collector; and an upper positive electrode active material layer disposed on the lower positive electrode active material layer, wherein the lower positive electrode active material layer includes 90% or more of a sphere-type carbonaceous conductive material as a conductive material, the upper positive electrode active material layer includes 90% or more of a needle-type carbonaceous conductive material as a conductive material, and the content of the conductive material contained in the lower positive electrode active material layer is larger than the content of the conductive material contained in the upper positive electrode active material layer.
    Type: Application
    Filed: June 26, 2018
    Publication date: October 10, 2019
    Applicant: LG Chem, Ltd.
    Inventors: Joo-Yul Baek, Jong-Heon Seol, Ye-Lin Kim, Je-Young Kim, Jung-Keun Yoo
  • Patent number: 10263281
    Abstract: The present invention provides an all-solid ion battery having improved stability and power characteristics and comprising: a powder-form solid electrolyte; a powder-form electrode active material; a first conductive polymer coating film coated on at least a portion of the solid electrolyte and capable of transporting ions; and a second conductive polymer coating film coated on at least a portion of the electrode active material and capable of transporting ions and electrons.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: April 16, 2019
    Assignees: SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION, KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Ki Suk Kang, In Sang Hwang, Yeon Sik Jung, Jung Keun Yoo, Jae Beom Jeon, Ki Ung Jeon
  • Publication number: 20190060878
    Abstract: The carbon nanotubes according to the present invention can provide higher conductivity by allowing the BET and crystal size to satisfy the conditions expressed by formula 1 below, and consequently, can improve the conductivity of a carbon composite material containing the carbon nanotubes. Lc×[Specific surface area of CNT (cm2/g)]1/2>80??[Formula 1] wherein, Lc is crystal size measured by X-ray diffraction.
    Type: Application
    Filed: March 21, 2017
    Publication date: February 28, 2019
    Inventors: Kyung Yeon KANG, Yelin KIM, Jihee WOO, Jung Keun YOO, Dong Hyun CHO
  • Publication number: 20190044150
    Abstract: The present invention provides a conductive material dispersed liquid including a conductive material which includes bundle-type carbon nanotubes; a dispersant which includes a hydrogenated nitrile-based rubber; and a dispersion medium, where a complex modulus (|G*| @ 1 Hz) is in a range of 20 to 500 Pa when measured by a rheometer at a frequency of 1 Hz, and a secondary battery manufactured using the same. The conductive material dispersed liquid has a controlled complex modulus to exhibit excellent dispersibility and powder resistance characteristics, and as a result, can greatly improve the output characteristics of batteries.
    Type: Application
    Filed: March 24, 2017
    Publication date: February 7, 2019
    Applicant: LG Chem, Ltd.
    Inventors: Ye Lin KIM, Ki Yeon JO, Jung Keun YOO, Je Young KIM, Sang Hoon CHOY, Jong Heon SEOL
  • Publication number: 20180175370
    Abstract: The present invention provides a conductive material dispersed liquid, including: a conductive material which includes bundle-type carbon nanotubes; a dispersant; a dispersion medium, where a phase angle is in a range of 3° to 18° when measured by a rheometer at a frequency of 1 Hz; and a lithium secondary battery manufactured using the conductive material dispersed liquid. The conductive material dispersed liquid has high solid-like properties, and thus allows the formation of an electrode active material layer having a uniform thickness with no concern for collapse or occurrence of cracks during manufacture of an electrode, and thereby can improve the performance characteristics, particularly capacity characteristics, of a battery.
    Type: Application
    Filed: October 28, 2016
    Publication date: June 21, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Ye Lin Kim, Ki Yeon Jo, Jung Keun Yoo, Je Young Kim, Sang Hoon Choy, Jong Heon Seol
  • Publication number: 20180147771
    Abstract: Disclosed is an apparatus for forming a plastic fuel tank for a vehicle, wherein when a parison is formed into semi-finished products having a shape of the fuel tank, the semi-finished products are formed by press forming using first and second molds and an intermediate mold. The semi-finished products are formed without using a blow molding process.
    Type: Application
    Filed: November 29, 2017
    Publication date: May 31, 2018
    Applicant: DONG HEE INDUSTRIAL CO., LTD.
    Inventor: Jung Keun YOO
  • Publication number: 20180076451
    Abstract: An electrode for a lithium secondary battery includes a current collector, primer layer formed on a side of the current collector and includes a first conductive agent, a first binder and a first dispersant. Further, an active material layer is formed on a side of the primer layer disposed opposite to the current collector and includes an active material. Additionally, the lithium secondary battery includes a positive electrode, a negative electrode or both, a separator disposed between the positive electrode and the negative electrode and an electrolyte. The structural stability and adhesion of the electrode is improved, a ratio of a binder in the active material layer is reduced and the internal resistance is reduced.
    Type: Application
    Filed: September 11, 2017
    Publication date: March 15, 2018
    Inventors: Seul Ki Kim, Jong Heon Seol, Hee Soo Na, Chan Sub Lee, Hyung Suk Cho, Jung Keun Yoo, Je Young Kim
  • Publication number: 20180006289
    Abstract: Disclosed is a positive electrode for a lithium secondary battery which uses a positive electrode active material containing secondary particles with a relatively weak particle strength to improve the adhesion between a positive electrode mixture layer and a current collector, and the positive electrode includes a positive electrode current collector; a primer coating layer including a first polymer binder and a first conductive material, having surface roughness (Ra) of 85 nm to 300 nm and formed on at least one surface of the positive electrode current collector; and a positive electrode mixture layer formed on an upper surface of the primer coating layer and including a positive electrode active material containing secondary particles with a compressive breaking strength of 1 to 15 MPa, a second polymer binder and a second conductive material.
    Type: Application
    Filed: June 29, 2017
    Publication date: January 4, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Jong-Heon Seol, Jin-Young Son, Hyung-Suk Cho, Sin-Young Jung, Yoon-Jung Choi, Yo-Jin Kim, Je-Young Kim, Sung-Joon Park, Jung-Keun Yoo, Sang-Hoon Choy
  • Publication number: 20170365877
    Abstract: The present invention provides an all-solid ion battery having improved stability and power characteristics and comprising: a powder-form solid electrolyte; a powder-form electrode active material; a first conductive polymer coating film coated on at least a portion of the solid electrolyte and capable of transporting ions; and a second conductive polymer coating film coated on at least a portion of the electrode active material and capable of transporting ions and electrons.
    Type: Application
    Filed: September 23, 2015
    Publication date: December 21, 2017
    Inventors: Ki Suk KANG, In Sang HWANG, Yeon Sik JUNG, Jung Keun YOO, Jae Beom JEON, Ki Ung JEON