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: 20180358622
    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: Application
    Filed: October 19, 2016
    Publication date: December 13, 2018
    Applicant: LG CHEM, LTD.
    Inventors: Jung Woo YOO, Hyung Suk CHO, Ye Cheol RHO, Kyung Hwa WOO, Kwang Ho JEONG, Je Young KIM
  • Patent number: 10153484
    Abstract: Provided are a porous silicon-based anode active material including a core part including silicon (Si) and MxSiy, and a shell part including Si and a plurality of pores on the core part, wherein, in the MxSiy, M is at least one element selected from the group consisting of Group 2A, 3A, and 4A elements and transition metals, 1?x?4, and 1?y?4, and a method of preparing the porous silicon-based anode active material. According to an embodiment of the present invention, capacity characteristics and lifetime characteristic of a lithium secondary battery may be improved by minimizing the volume expansion of an anode active material during charge and discharge.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: December 11, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Yong Ju Lee, Jun Sik Ham, Sung Man Lee, Rae Hwan Jo, Eun Kyung Kim, Je Young Kim, Hong Kyu Park, Jung Woo Yoo, Mi Rim Lee
  • Publication number: 20180294512
    Abstract: The present invention relates to a binder for a secondary battery electrode, a secondary battery electrode composition including the binder, and a secondary battery using the same. The binder includes a copolymer having a polyvinyl alcohol (PVA) and an ionically substituted acrylate. The binder may have an excellent electrode adhesive force, prevent an electrode deformation caused by the expansion and contraction of an electrode active material, and improve charge/discharge life characteristics, and further, simplify manufacturing processes.
    Type: Application
    Filed: July 12, 2017
    Publication date: October 11, 2018
    Applicant: LG CHEM, LTD.
    Inventors: Young Jae KIM, Ye Cheol RHO, Jung Woo YOO, Jun Soo PARK
  • Publication number: 20180219217
    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: Application
    Filed: March 29, 2017
    Publication date: August 2, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Jun Soo Park, Ji Hee Yoon, Je Young Kim, Jung Woo Yoo
  • Publication number: 20180210034
    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: Application
    Filed: October 7, 2016
    Publication date: July 26, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Taek Soo Lee, Jung Woo Yoo, Je Young Kim
  • Patent number: 9991509
    Abstract: Provided are an anode active material including a porous silicon oxide-carbon material composite which includes a porous silicon oxide including pores and a line-type carbon material coated on a surface, in the pores, or on the surface and in the pores of the porous silicon oxide, and a method of preparing the anode active material. Since the silicon oxide of the anode active material according to an embodiment of the present invention may include the plurality of pores, resistance to the mechanical stress due to a volume change may be improved. Also, since the line-type carbon material is bonded to the inside of the pores, conductivity may not be decreased even in the case in which internal cracks occur in the porous silicon oxide and lifetime characteristics may be improved.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: June 5, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Je Young Kim, Yong Ju Lee, Seung Youn Choi, Yoon Ah Kang, Mi Rim Lee, Hye Ran Jung
  • Publication number: 20180151909
    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 25, 2016
    Publication date: May 31, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Jung Woo YOO, Hyeok Moo LEE, Ji Hye PARK, Song Taek OH
  • Publication number: 20180138557
    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: Application
    Filed: November 14, 2017
    Publication date: May 17, 2018
    Inventors: Kwang-Ho Jeong, Ye-Cheol Rho, Jin-Sook Ryu, Je-Young Kim, Jung-Woo Yoo
  • Patent number: 9947922
    Abstract: Provided are a porous silicon-based particle including a silicon (Si) or SiOx(0<x<2) particle, wherein the particle includes a plurality of nonlinear pores, and the nonlinear pores are formed as open pores in a surface of the particle, and a method of preparing the porous silicon-based particles. Porous silicon-based particles according to an embodiment of the present invention may be more easily dispersed in an anode active material slurry, may minimize side reactions with an electrolyte, and may reduce volume expansion during charge and discharge. Also, according to an embodiment of the present invention, the shape, form, and size of pores formed in the porous silicon-based particle may be controlled by adjusting the type of a metal catalyst, the concentration of the catalyst, and etching time.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: April 17, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Mi Rim Lee, Yong Ju Lee, Eun Kyung Kim, Han Ho Lee, Ji Hyun Yoon, Byoung Man Bang, Chang Rae Lee, Il Kyo Jeong, Mi Kyeong Lee
  • Patent number: 9879344
    Abstract: Disclosed herein is an electrode active material for a secondary battery, and more particularly to an electrode active material comprising a porous silicon oxide-based composite and the method for preparing a porous silicon oxide-based composite.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: January 30, 2018
    Assignee: LG Chem, Ltd.
    Inventors: Yong Ju Lee, Yoon Ah Kang, Mi Rim Lee, Jung Woo Yoo, Je Young Kim
  • Publication number: 20180006300
    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: Application
    Filed: July 5, 2017
    Publication date: January 4, 2018
    Applicant: LG Chem, Ltd.
    Inventors: Kwang Ho Jeong, Ye Cheol Rho, Jung Woo Yoo, Je Young Kim
  • Patent number: 9843034
    Abstract: Provided are a porous silicon-based anode active material including crystalline silicon (Si) particles, and a plurality of pores on surfaces, or the surfaces and inside of the crystalline silicon particles, wherein at least one plane of crystal planes of at least a portion of the plurality of pores includes a (100) plane, and a method of preparing the porous silicon-based anode active material. Since a porous silicon-based anode active material of the present invention may allow volume expansion, which is occurred during charge and discharge of a lithium secondary battery, to be concentrated on pores instead of the outside of the anode active material, the porous silicon-based anode active material may improve life characteristics of the lithium secondary battery by efficiently controlling the volume expansion.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: December 12, 2017
    Assignee: LG Chem, Ltd.
    Inventors: Yong Ju Lee, Mi Rim Lee, Jung Woo Yoo, Je Young Kim
  • Publication number: 20170309896
    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: Application
    Filed: March 31, 2017
    Publication date: October 26, 2017
    Applicant: LG Chem, Ltd.
    Inventors: Kwang Ho Jeong, Yecheol Rho, Jung Woo Yoo, Je Young Kim
  • Publication number: 20170288231
    Abstract: The present invention relates to a method of preparing a negative electrode slurry, and, specifically, the present invention provides a method of preparing a negative electrode slurry which includes the steps of preparing a first negative electrode slurry including a silicon-based active material, a carboxymethyl cellulose, and a styrene-butadiene rubber, and a second negative electrode slurry including a graphite-based active material, a conductive agent, a styrene-butadiene rubber, and a carboxymethyl cellulose (step 1), and mixing the first negative electrode slurry and the second negative electrode slurry which are prepared in step 1 (step 2).
    Type: Application
    Filed: March 27, 2017
    Publication date: October 5, 2017
    Applicant: LG Chem, Ltd.
    Inventors: Ji Hee Yoon, Jun Soo Park, Je Young Kim, Jung Woo Yoo
  • Patent number: 9711787
    Abstract: Provided are an anode active material including carbon-based particles, silicon nanowires grown on the carbon-based particles, and a carbon coating layer on surfaces of the carbon-based particles and the silicon nanowires, and a method of preparing the anode active material. Since the anode active material of the present invention is used in a lithium secondary battery, physical bonding force between the carbon-based particles and the silicon nanowires may not only be increased but conductivity may also be improved. Thus, lifetime characteristics of the battery may be improved.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: July 18, 2017
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Won Jong Kwon, Eui Yong Hwang, Kil Sun Lee, Je Young Kim, Yong Ju Lee
  • Publication number: 20170155152
    Abstract: The present disclosure relates to a binder for a secondary battery having improved properties and a negative electrode for a secondary battery including the same, and through controlling a weight ratio of styrene-butadiene-based rubber and acryl-based rubber included in the binder for a secondary battery, a negative electrode for a secondary battery having reduced electrode resistance while improving electrode adhesive strength is provided by including the binder having an optimal composition exhibiting most excellent battery properties in identical content.
    Type: Application
    Filed: November 29, 2016
    Publication date: June 1, 2017
    Applicant: LG CHEM, LTD.
    Inventors: Jung Woo YOO, Jun Soo PARK, Ji Hee YOON, Je Young KIM
  • Publication number: 20170047559
    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: Application
    Filed: January 30, 2015
    Publication date: February 16, 2017
    Applicant: LG CHEM, LTD.
    Inventors: Jung Woo YOO, Je Young KIM, Geun Chang CHUNG
  • Patent number: 9548493
    Abstract: Provided are a porous composite expressed by Chemical Formula 1 and having a porosity of 5% to 90%, and a method of preparing the same: MOx??<Chemical Formula 1> where M and x are the same as described in the specification. According to the present invention, since a molar ratio (x) of oxygen to a molar ratio of (semi) metal in the porous composite is controlled, an initial efficiency of a secondary battery may be increased. Also, since the porous composite satisfies the above porosity, a thickness change rate of an electrode generated during charge and discharge of the secondary battery may be decreased and lifetime characteristics may be improved.
    Type: Grant
    Filed: January 27, 2014
    Date of Patent: January 17, 2017
    Assignee: LG Chem, Ltd.
    Inventors: Jung Woo Yoo, Yong Ju Lee, Yoon Ah Kang, Mi Rim Lee, Je Young Kim
  • Publication number: 20170012252
    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: Application
    Filed: January 29, 2015
    Publication date: January 12, 2017
    Applicant: LG CHEM, LTD.
    Inventors: Jung Woo YOO, In Sung UHM, Je Young KIM
  • Publication number: 20160197342
    Abstract: Provided is an active material for negative electrode including porous silicon-based particles and carbon particles, wherein the carbon particles include fine carbon particles and coarse carbon particles respectively having different average particle diameters. Since an active material for negative electrode according to an embodiment of the present invention includes porous silicon-based particles as well as fine and coarse carbon particles respectively having different average particle diameters, the contact between the porous silicon-based particles and the carbon particles may be increased. As a result, lifetime characteristics of a lithium secondary battery may be further improved.
    Type: Application
    Filed: September 16, 2014
    Publication date: July 7, 2016
    Applicant: LG Chem, Ltd.
    Inventors: Mi Rim Lee, Hyun Chul Kim, Eun Kyung Kim, Yong Ju Lee, Jung Woo Yoo