Patents by Inventor Jung Woo Yoo

Jung Woo 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: 20200388850
    Abstract: The present invention provides a composition for forming an insulating layer for a lithium secondary battery, which includes a binder polymer; a coloring agent including at least one selected from the group consisting of an organic dye, an oil-soluble dye and an organic phosphor; and a solvent, and has a viscosity of 1,000 cP or more at 25 ° C.
    Type: Application
    Filed: February 1, 2019
    Publication date: December 10, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Sung Chul Park, Ung Ju Lee, Koo Seung Chung, Won Hee Jeong, Jung Woo Yoo, Young Jae Kim
  • Patent number: 10862125
    Abstract: The present invention relates to an electrode active material slurry, which includes (a) an electrode active material, (b) a conductive agent, (c) a binder, (d) a solvent, and (e) a cellulose-based compound having a weight-average molecular weight (Mw) of 2,000,000 to 3,000,000, a degree of substitution of 1.0 to 1.2, and a viscosity (Brookfield viscometer, speed of 12 rpm) of 4,000 cps to 10,000 cps, and an electrode and a lithium secondary battery which include the same. Phase stability of the electrode active material slurry may be improved and battery characteristics may be improved by using the cellulose-based compound having molecular weight and degree of substitution within a specific range.
    Type: Grant
    Filed: March 28, 2017
    Date of Patent: December 8, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Kyung Hwa Woo, Kwang Ho Jeong, Jung Woo Yoo, Ye Cheol Rho, Je Young Kim
  • Publication number: 20200343541
    Abstract: A positive electrode and a secondary battery including the same are provided. The positive electrode includes a current collector and a positive electrode active material layer disposed on the current collector, wherein the positive active material layer includes a positive electrode active material, a binder, and a multi-walled carbon nanotube, wherein the multi-walled carbon nanotube has an average length of 1-2 ?m and has a length standard deviation of 0.5 ?m or less.
    Type: Application
    Filed: February 1, 2019
    Publication date: October 29, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Ye Lin Kim, Tae Gon Kim
  • Publication number: 20200266477
    Abstract: An electrode mixture of the present invention comprises: an electrode active material; a binder; and a conductive material. When a cross-section of the electrode mixture is imaged such that a pixel filled 100% with a conductive material among a plurality of divided pixels is considered to be a condensed pixel and a value obtained by counting condensed pixels is considered to be the degree of agglomeration, the degree of agglomeration of a conductive material in the electrode mixture in the depth direction of the electrode mixture has a standard deviation less than 3.0. The electrode mixture as described above includes a conductive material uniformly distributed therein and thus has low electrode resistance. Therefore, the electrode mixture can improve output and lifespan properties of a lithium secondary battery to which the electrode mixture has been applied.
    Type: Application
    Filed: May 1, 2020
    Publication date: August 20, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Hyeok Moo Lee, Ji Hye Park, Song Taek Oh
  • Publication number: 20200235395
    Abstract: A binder composition for a secondary battery which includes a copolymer binder including at least one unit selected from (A) a unit derived from a vinyl-based monomer, (B) a unit derived from a conjugated diene-based monomer or a conjugated diene-based polymer, (C) a unit derived from a (meth)acrylic acid ester-based monomer, and (D) a unit derived from a water-soluble polymer, wherein the copolymer binder has a wet modulus of 0.02 MPa or more, and a negative electrode for a lithium secondary battery and a lithium secondary battery which include the same.
    Type: Application
    Filed: March 29, 2018
    Publication date: July 23, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Ji Hee YOON, Jung Woo YOO, Je Young KIM
  • Publication number: 20200227750
    Abstract: The present invention relates to an electrode active material slurry, which includes (a) an electrode active material, (b) a conductive agent, (c) a binder, (d) a solvent, and (e) a cellulose-based compound having a weight-average molecular weight (Mw) of 2,000,000 to 3,000,000, a degree of substitution of 1.0 to 1.2, and a viscosity (Brookfield viscometer, speed of 12 rpm) of 4,000 cps to 10,000 cps, and an electrode and a lithium secondary battery which include the same. Phase stability of the electrode active material slurry may be improved and battery characteristics may be improved by using the cellulose-based compound having molecular weight and degree of substitution within a specific range.
    Type: Application
    Filed: March 28, 2017
    Publication date: July 16, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Kyung Hwa Woo, Kwang Ho Jeong, Jung Woo Yoo, Ye Cheol Rho, Je Young Kim
  • Patent number: 10700387
    Abstract: A carboxymethyl cellulose is provided with a polydispersity index of 10 or more and a weight average molecular weight of 2,000,000 or more in a negative electrode mix slurry. Accordingly, phase stability of the negative electrode mix slurry is improved, achieving improved adhesiveness and low resistance of a negative electrode manufactured therefrom.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: June 30, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Kwang-Ho Jeong, Ye-Cheol Rho, Jin-Sook Ryu, Je-Young Kim, Jung-Woo Yoo
  • Publication number: 20200203778
    Abstract: A positive electrode slurry composition for a secondary battery which includes a positive electrode active material, a carbon-based conductive agent having a specific surface area (Brunauer-Emmett-Teller (BET)) of 100 m2/g to 200 m2/g, a binder, and a nitrile-based copolymer which has an electrolyte solution swelling degree defined by Equation (1) of 200% or less and does not contain a functional group other than a cyano group is provided: electrolyte solution swelling degree (%)={(W1?W0)/W0}×100??Equation (1) wherein, W0 is an initial weight of a polymer film prepared from the nitrile-based copolymer, and W1 is a weight of the polymer film which is measured after storing the polymer film at 60° for 48 hours in an electrolyte solution.
    Type: Application
    Filed: March 4, 2020
    Publication date: June 25, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Hye Lim Shim, Jun Muk Lim
  • Patent number: 10680276
    Abstract: An electrode mixture of the present invention comprises: an electrode active material; a binder; and a conductive material. When a cross-section of the electrode mixture is imaged such that a pixel filled 100% with a conductive material among a plurality of divided pixels is considered to be a condensed pixel and a value obtained by counting condensed pixels is considered to be the degree of agglomeration, the degree of agglomeration of a conductive material in the electrode mixture in the depth direction of the electrode mixture has a standard deviation less than 3.0. The electrode mixture as described above includes a conductive material uniformly distributed therein and thus has low electrode resistance. Therefore, the electrode mixture can improve output and lifespan properties of a lithium secondary battery to which the electrode mixture has been applied.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: June 9, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Hyeok Moo Lee, Ji Hye Park, Song Taek Oh
  • Patent number: 10663528
    Abstract: A method of the present invention includes measuring a thickness of an electrode in which an active material layer is formed on a current collector (Step 1); fixing the active material layer of the electrode to a substrate (Step 2); attaching a removal tape to the current collector of the electrode, and then measuring an adhesive strength of the removal tape and measuring a thickness of the electrode after the removal (Step 3); attaching a removal tape to the active material layer from which the current collector is removed, and then measuring an adhesive strength of the removal tape and measuring the thickness of the electrode after the removal, wherein this procedure is repeated until a measurement limit is reached (Step 4); and determining a distribution of a binder according to the thickness of the electrode from measured values obtained in Steps 3 and 4 (Step 5).
    Type: Grant
    Filed: October 7, 2016
    Date of Patent: May 26, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Taek Soo Lee, Jung Woo Yoo, Je Young Kim
  • Patent number: 10644316
    Abstract: The present invention provides an anode slurry for a secondary battery and an anode comprising the same, in which the dispersibility of an anode active material is improved by increasing the adsorption amount of CMC with respect to the anode active material by adjusting the degree of substitution or physical properties such as molecular weight, and a CMC blend amount is reduced so as to increase the slurry solid content and reduce the resistance of a battery.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: May 5, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Jung Woo Yoo, Hyung Suk Cho, Ye Cheol Rho, Kyung Hwa Woo, Kwang Ho Jeong, Je Young Kim
  • Patent number: 10622597
    Abstract: Disclosed herein is a battery cell configured to have a structure in which an electrode assembly is mounted in a battery case made of a laminate sheet including a resin layer and a metal layer, and the battery case is provided with a sealed portion (an outer edge sealed portion), which is formed at the outer edge of a receiving part, in which the electrode assembly is mounted, by thermal welding in order to seal the battery case, wherein electrode terminals are located at an upper sealed portion, a lower sealed portion, or the upper sealed portion and the lower sealed portion, two or more sealed lines are formed in at least one of side sealed portions, which are adjacent to the upper sealed portion or the lower sealed portion, such that the sealed lines are spaced apart from each other and parallel to each other, the sealed lines are continuously formed from the outer edge end of the upper sealed portion to the outer edge end of the lower sealed portion in the longitudinal direction of the battery case, and t
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: April 14, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Jung Woo Yoo, In Sung Uhm, Je Young Kim
  • Patent number: 10608247
    Abstract: The present invention provides a negative electrode for a secondary battery, the negative electrode including a negative electrode current collector, a first negative electrode active material layer located on the negative electrode current collector, and a second negative electrode active material layer located on the first negative electrode active material layer, such that resistance in the electrode is decreased due to an increase in adhesion between the negative electrode current collector and the active material and cohesion between the active materials, thereby significantly improving capacity and lifespan characteristics of a battery, a method of fabricating the same, and a secondary battery including the same.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: March 31, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Jun Soo Park, Ji Hee Yoon, Je Young Kim, Jung Woo Yoo
  • Patent number: 10593937
    Abstract: The present invention relates to a negative electrode including an active material layer which includes carbon-based particles having an oxygen content of 700 mg/kg to 1,700 mg/kg, and a secondary battery including the same.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: March 17, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Kwang Ho Jeong, Ye Cheol Rho, Jung Woo Yoo, Je Young Kim
  • Publication number: 20200075941
    Abstract: The present invention relates to a negative electrode including a current collector and a negative electrode active material layer disposed on the current collector, wherein the negative electrode active material layer includes a negative electrode active material, carbon black, and a binder, wherein the negative electrode active material includes silicon particles, and the binder includes a copolymer containing a unit derived from a poly(vinylalcohol) (PVA) and a unit derived from an ionized and substituted acrylate, the binder being included in the negative electrode active material layer in an amount of 18 wt % to 22 wt %.
    Type: Application
    Filed: September 5, 2019
    Publication date: March 5, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Young Jae KIM, Jung Woo YOO
  • Patent number: 10319953
    Abstract: Disclosed herein is a battery cell configured to have a structure in which a stacked structure including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is mounted in a receiving part of a battery case, one or more holes are formed from the battery case to the positive electrode or the negative electrode of the electrode assembly, and a transparent window is formed in a portion of the battery case corresponding to the holes.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: June 11, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Je Young Kim, Geun Chang Chung
  • Patent number: 10276864
    Abstract: The anode active material of the present invention comprises silicon-based particles obtained from at least one of silicon, a silicon oxide and a silicon alloy, and the silicon-based particles have a faceted shape, thereby providing high capacity and good life characteristics without causing any deterioration which has been generated in the use of conventional silicon-based particles, and eventually providing a lithium secondary battery having such characteristics.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: April 30, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Yong-Ju Lee, Yoon-Ah Kang, Je-Young Kim, Seung-Youn Choi, Mi-Rim Lee, Hye-Ran Jung, Jung-Woo Yoo
  • Patent number: 10256462
    Abstract: Disclosed is a negative electrode for secondary batteries including a negative electrode mix applied to a current collector, the negative electrode mix including a negative electrode active material, a thickening agent and an aqueous binder, wherein the thickening agent is a carboxymethyl cellulose lithium salt (CMC—Li salt) having a substitution degree of a hydroxyl group (—OH) by a carboxymethyl lithium group (—CH2COOLi) of 0.7 to 1.5 and the thickening agent is present in an amount of higher than 0.6% by weight and not higher than 1.4% by weight, with respect to the total weight of the negative electrode mix.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: April 9, 2019
    Assignee: LG Chem, Ltd.
    Inventors: Kwang Ho Jeong, Yecheol Rho, Jung Woo Yoo, Je Young Kim
  • Patent number: 10205137
    Abstract: Disclosed is a secondary battery to which an electrolyte can be additionally supplied. More particularly, provided is a secondary battery including an electrode assembly that includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a porous elastic body that can contain an electrolyte, which are installed in a battery case.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: February 12, 2019
    Assignee: LG Chem, Ltd.
    Inventors: In Sung Uhm, Ji Yoon Kwon, Jung Woo Yoo, Je Young Kim, Hoe Jin Hah, Kyoung Ho Kim, Il Hong Kim
  • Patent number: 10205164
    Abstract: Provided are a porous silicon-based anode active material including porous SiOx particles (0?x<2) having surfaces coated with an oxide layer, a method of preparing the same, and a lithium secondary battery including the porous silicon-based anode active material. Since the anode active material includes an oxide layer formed on the porous SiOx particles (0?x<2), a reactivity between the anode active material and an electrolyte solution may be reduced and, as a result, an electrical short circuit in an electrode may be minimized. Also, since a plurality of pores is included in surfaces or the surfaces and inside of the SiOx particles, a thickness change rate of the electrode generated during charge and discharge of a secondary battery may be reduced and lifetime characteristics may be improved.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: February 12, 2019
    Assignees: LG Chem Ltd., SJ Materials Co., Ltd.
    Inventors: Mi Rim Lee, Jung Woo Yoo, Eun Kyung Kim, Yong Ju Lee, Han Ho Lee, Ji Hyun Yoon, Byoung Man Bang, Chang Rae Lee, Il Kyo Jeong, Mi Kyeong Lee