Patents by Inventor Joo Yul Baek

Joo Yul Baek 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: 20210057728
    Abstract: A method for quantitatively analyzing cohesive failure of an electrode analyzes cohesive failure of an electrode and includes preparing an electrode in which an electrode material mixture layer including an electrode active material, a conductive agent, and a binder is formed on a current collector, measuring shear strength (?) data according to a cutting depth while cutting the electrode material mixture layer from a surface thereof until reaching the current collector using a surface and interfacial cutting analysis system (SAICAS), obtaining a regression curve of shear strength according to the cutting depth from the shear strength (?) data, and determining a cutting depth, at which the shear strength is minimum in the regression curve, as a location of cohesive failure.
    Type: Application
    Filed: August 18, 2020
    Publication date: February 25, 2021
    Applicant: LG CHEM, LTD.
    Inventors: In Young SONG, Joo Yul BAEK, Jeong Kyu LEE, Sung Joon OH, Jong Chan LEE
  • Publication number: 20210057719
    Abstract: An electrode for a secondary battery including a current collector, and at least one electrode material mixture layer on a surface of the current collector, the electrode material mixture layer including a negative electrode active material, a conductive agent, and a binder wherein, the electrode has a property such that in a regression curve obtained by regression analysis of shear strength data according to a cutting depth which are measured while obliquely cutting the electrode material mixture layer from a surface thereof until reaching the current collector using a surface and interfacial cutting analysis system (SAICAS), a ratio of a maximum value (?max) to a minimum value (?min) of shear strength is 1.7 or less.
    Type: Application
    Filed: August 18, 2020
    Publication date: February 25, 2021
    Applicant: LG CHEM, LTD.
    Inventors: In Young SONG, Joo Yul BAEK, Jeong Kyu LEE, Sung Joon OH, Jong Chan LEE
  • Publication number: 20210057749
    Abstract: A positive electrode includes: a current collector; and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer includes a positive electrode active material, a conductive material, and a binder, the conductive material contains at least one of carbon black or a carbon nanotube and the binder contains polyvinylidene fluoride to which a functional group is bonded, and the functional group has a carboxyl group, and in the polyvinylidene fluoride to which the functional group is bonded.
    Type: Application
    Filed: February 22, 2019
    Publication date: February 25, 2021
    Applicant: LG Chem, Ltd.
    Inventors: Jun Muk Lim, Joo Yul Baek, Sang Hoon Choy
  • 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: 20210012483
    Abstract: Provided is an analysis method for a crack rate of an electrode active material of an electrode, comprising the steps of: forming an electrode including an electrode active material, a binder, and a conductive material; impregnating the electrode with a resin and visualizing material regions including the electrode active material, the binder, and the conductive material which are included in the electrode, and a pore region; cutting the electrode and forming an electrode cross-section sample; photographing a cross section of the electrode cross-section sample using a scanning electron microscope and obtaining a cross-sectional image; performing primary image processing on the cross-sectional image and extracting total surface area pixels of the electrode active material; performing secondary image processing on the cross-sectional image and extracting total boundary pixels of the electrode active material; and calculating a crack rate of the electrode active material of the electrode in the cross-sectional i
    Type: Application
    Filed: July 7, 2020
    Publication date: January 14, 2021
    Inventors: Jung Hoon Han, Joo Yul Baek
  • Publication number: 20200373559
    Abstract: A positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, wherein the positive electrode active material layer includes a positive electrode active material, carbon nanotube, and a binder, the binder includes polyvinylidene fluoride which has a weight average molecular weight of 720,000 g/mol to 980,000 g/mol, a BET specific surface area of the carbon nanotube is 140 m2/g to 195 m2/g, and the positive electrode satisfies the following Formula 1: 1.3?B/A?3.4??[Formula 1] in Formula 1, B is an amount (wt %) of the polyvinylidene fluoride in the positive electrode active material layer, and A is an amount (wt %) of the carbon nanotube in the positive electrode active material layer.
    Type: Application
    Filed: February 19, 2019
    Publication date: November 26, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo Yul Baek, Jun Muk Lim, Chang Ju Lee, Il Geun Oh, Je Young Kim, Sang Hoon Choy
  • Publication number: 20200358103
    Abstract: A secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein the positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, the positive electrode active material layer includes a positive electrode active material and carbon nanotubes, and the electrolyte solution includes a non-aqueous solvent, a lithium salt, and tetravinylsilane.
    Type: Application
    Filed: February 22, 2019
    Publication date: November 12, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Joo Yul Baek, Young Min Lim, Jun Muk Lim, Sang Hoon Choy, Chul Haeng Lee
  • Patent number: 10777816
    Abstract: A method for preparing an electrode for a secondary battery, includes preparing an electrode slurry having an electrode active material and a binder and producing a pre-electrode by coating a first surface of both surfaces of a current collector with the electrode slurry while the first surface is disposed in an upward direction. Additionally, the method includes drying the pre-electrode while the electrode slurry coated on the first surface of the current collector is inverted to be disposed in a downward direction.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: September 15, 2020
    Assignee: LG Chem, Ltd.
    Inventor: Joo Yul Baek
  • 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: 10483549
    Abstract: The present invention relates to a method of manufacturing an electrode current collector for a secondary battery and an electrode including an electrode current collector manufactured using the method. In particular, provided herein are a method of manufacturing an electrode current collector for a secondary battery which includes forming a CNT coating layer on a surface of an electrode current collector to increase electrical conductivity, and an electrode including an electrode current collector manufactured according to the method.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: November 19, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Joo Yul Baek, Song Taek Oh, Young Geun Choi
  • 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
  • Publication number: 20180248195
    Abstract: Provided are a positive electrode for a secondary battery which includes a positive electrode collector, a porous positive electrode active material layer disposed on a surface of the positive electrode collector and including a positive electrode active material and first carbon nanotubes, and a conductive layer disposed on a surface of the positive electrode active material layer, wherein the conductive layer includes a porous network structure formed by a plurality of second carbon nanotubes and has a porosity equal to or greater than a porosity of the positive electrode active material layer+10 vol %, and a secondary battery including the same.
    Type: Application
    Filed: November 30, 2016
    Publication date: August 30, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Young Geun Choi, Hyo Sik Kim, Joo Yul Baek, Song Taek Oh
  • Publication number: 20180241045
    Abstract: The present invention relates to a method of manufacturing an electrode current collector for a secondary battery and an electrode including an electrode current collector manufactured using the method. In particular, provided herein are a method of manufacturing an electrode current collector for a secondary battery which includes forming a CNT coating layer on a surface of an electrode current collector to increase electrical conductivity, and an electrode including an electrode current collector manufactured according to the method.
    Type: Application
    Filed: March 15, 2017
    Publication date: August 23, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Joo Yul Baek, Song Taek Oh, Young Geun Choi
  • Publication number: 20180114986
    Abstract: A method for preparing an electrode for a secondary battery, includes preparing an electrode slurry having an electrode active material and a binder and producing a pre-electrode by coating a first surface of both surfaces of a current collector with the electrode slurry while the first surface is disposed in an upward direction. Additionally, the method includes drying the pre-electrode while the electrode slurry coated on the first surface of the current collector is inverted to be disposed in a downward direction.
    Type: Application
    Filed: October 25, 2017
    Publication date: April 26, 2018
    Inventor: Joo Yul Baek