Patents by Inventor Sang-Wook Woo

Sang-Wook Woo 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: 11183683
    Abstract: A method of pre-lithiating an electrode for a secondary battery, the method including: a first step of bringing a lithium metal into direct contact with an electrode in an electrolyte and applying pressure to the electrode to prepare a pre-lithiated electrode; and a second step of removing the lithium metal and then applying pressure to the pre-lithiated electrode to perform a stabilization process. The electrode for the secondary battery after going through the pre-lithiation can relieve volume change of the electrode and reduce contact loss of the electrode.
    Type: Grant
    Filed: July 27, 2018
    Date of Patent: November 23, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Oh Byong Chae, Yoon Ah Kang, Jun Hyuk Song, Eun Kyung Kim, Sang Wook Woo
  • Publication number: 20210328220
    Abstract: A negative electrode active material for a secondary battery including: natural graphite particles; and a carbon coating layer on a surface and in an inside of the natural graphite particles. The negative electrode active material for a secondary battery has a porosity of 3% to 13%.
    Type: Application
    Filed: January 16, 2020
    Publication date: October 21, 2021
    Applicant: LG ENERGY SOLUTION, LTD.
    Inventors: Hee Won CHOI, Je Young KIM, Sang Wook WOO, Li Lin PIAO
  • Publication number: 20210273223
    Abstract: A negative electrode for a lithium secondary battery including a negative electrode active material layer. The negative electrode active material layer is formed by steps of coating a negative electrode mixture slurry including spheroidized natural graphite particles as a negative electrode active material on at least one surface of a negative electrode current collector, followed by drying and pressing the negative electrode mixture slurry on the at least one surface of the negative electrode current collector. The spheroidized natural graphite particles include a plurality of pores. The negative electrode active material layer has a Brunauer-Emmett-Teller (BET) specific surface area of the negative electrode active material layer after the pressing is larger than a BET specific surface area of the negative electrode active material layer before pressing. A difference in the BET specific surface area before and after pressing ranges from 0.9 m2/g to 1.2 m2/g.
    Type: Application
    Filed: January 31, 2020
    Publication date: September 2, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Lilin PIAO, Je-Young KIM, Sang-Wook WOO, Hee-Won CHOI
  • Publication number: 20210273212
    Abstract: A method for manufacturing negative electrode active material including the steps of manufacturing a pellet by extruding a mixture of lithium metal and negative electrode active material, immersing the pellet in an electrolyte comprising an SEI film-forming additive, and manufacturing the pellet into powder form by grinding, washing and drying same. A negative electrode and a lithium rechargeable battery manufactured using the lithium-active material powder has an SEI film that is uniformly formed by having lithium uniformly doped in the negative electrode. During initial charging, the SEI film is stably formed, and thus an effect is achieved whereby the initial efficiency of the lithium rechargeable battery is improved.
    Type: Application
    Filed: January 20, 2020
    Publication date: September 2, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Ye Ri KIM, Sang Wook WOO, Oh Byong CHAE
  • Publication number: 20210265630
    Abstract: An anode active material for a secondary battery that has improved cycle swelling properties and rapid charge performance, an anode comprising same, and a method for manufacturing same. The anode active material is a mixture of artificial graphite and spherical natural graphite, wherein the spherical natural graphite has an average particle diameter (D 50) of 12 ?m or less, with D 90-D 10 value ranging from 5 ?m to 12 ?m.
    Type: Application
    Filed: December 10, 2019
    Publication date: August 26, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Hee Won CHOI, Je Young KIM, Sang Wook WOO, Li Lin PIAO
  • Publication number: 20210257602
    Abstract: A method of manufacturing a negative electrode for lithium secondary batteries. With the method, a negative electrode for lithium secondary batteries having excellent cycle performance may be manufactured by performing a process of compressing the negative electrode after pre-lithiation of the negative electrode so that the porosity of the negative electrode after the pre-lithiation is maintained within a certain range.
    Type: Application
    Filed: October 10, 2019
    Publication date: August 19, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Ye Ri KIM
  • Publication number: 20210218016
    Abstract: A negative electrode for a lithium secondary battery, a negative electrode in which the negative electrode is pre-lithiated, a method of manufacturing the negative electrode, and a lithium secondary battery including the negative electrode The pre-lithiated negative electrode may increase the capacity and improve the electrochemical performance of a lithium secondary battery by securing the initial reversibility of a negative electrode.
    Type: Application
    Filed: July 4, 2019
    Publication date: July 15, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Ye Ri KIM
  • Publication number: 20210184205
    Abstract: An anode active material for a secondary battery, which has improved cycle swelling properties and rapid charge performance, an anode comprising an anode active material for a secondary battery, and a method for manufacturing same. The anode active material is a mixture of scaly natural graphite and spherical natural graphite. An average particle diameter (D50) of the scaly natural graphite is 10 ?m to 15 ?m and an average particle diameter (D50) of the spherical natural graphite is 14 ?m or less.
    Type: Application
    Filed: January 3, 2020
    Publication date: June 17, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Hee Won CHOI, Je Young KIM, Sang Wook WOO, Li Lin PIAO
  • Publication number: 20210167398
    Abstract: A negative electrode for a lithium secondary battery including a negative electrode current collector and a negative electrode active material layer formed on at least one surface of the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material including artificial graphite particles, and the negative electrode has a pore resistance Rp of 6? or less.
    Type: Application
    Filed: August 12, 2019
    Publication date: June 3, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Hee Won CHOI, Sang Wook WOO
  • Publication number: 20210159500
    Abstract: A method of manufacturing a negative electrode for a lithium secondary battery, the method includes forming a negative electrode active material layer on a negative electrode current collector to manufacture a negative electrode assembly, and pre-lithiating the negative electrode assembly. The pre-lithiating of the negative electrode assembly includes a first pre-lithiation step of performing pre-lithiation by impregnating the negative electrode assembly with a first pre-lithiation solution and a second pre-lithiation step of performing pre-lithiation by impregnating the negative electrode assembly with a second pre-lithiation solution after the first pre-lithiation step. The first pre-lithiation solution includes an ionizable first lithium salt, a first organic solvent, and a first additive. The second pre-lithiation solution includes an ionizable second lithium salt, a second organic solvent, and a second additive.
    Type: Application
    Filed: September 11, 2019
    Publication date: May 27, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Ye Ri KIM
  • Publication number: 20210159491
    Abstract: A method for manufacturing a lithium secondary battery, including the steps: (S1) forming a preliminary negative electrode by coating a negative electrode slurry including a negative electrode active material, conductive material, binder and a solvent onto at least one surface of a current collector, followed by drying and pressing the negative electrode slurry coated current collector, to form a negative electrode active material layer surface on the current collector; (S2) coating lithium metal foil onto the negative electrode active material layer surface of the preliminary negative electrode in the shape of a pattern in which pattern units are arranged; (S3) cutting the preliminary negative electrode on which the lithium metal foil is pattern-coated to obtain negative electrode units; (S4) impregnating the negative electrode units with an electrolyte to obtain a pre-lithiated negative electrode; and (S5) assembling the negative electrode obtained from step (S4) with a positive electrode and a separator.
    Type: Application
    Filed: March 20, 2019
    Publication date: May 27, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh-Byong CHAE, Sang-Wook WOO, Je-Young KIM
  • Publication number: 20210135274
    Abstract: A pre-lithiation apparatus that pre-lithiates a negative electrode structure having a first surface on which a negative electrode is disposed to produce a negative electrode unit of a battery, the apparatus includes a first roll rotatable to wind or unwind the negative electrode structure before the pre-lithiation is performed, a second roll installed to be spaced apart from the first roll and rotatable to wind and collect the negative electrode structure, on which the pre-lithiation is performed, and a lithium roll crossing a direction in which the negative electrode structure is transferred from the first roll to the second roll to come into contact with at least one of a first surface and a second surface of the negative electrode structure while being transferred from the first roll to the second roll. The lithium roll includes a lithium foil and an elastic member.
    Type: Application
    Filed: December 29, 2017
    Publication date: May 6, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Yoon Ah KANG, Jun Hyuk SONG, Eun Kyung KIM, Sang Wook WOO
  • Publication number: 20210122639
    Abstract: An anode active material for secondary batteries which has improved cycle swelling characteristics and rapid charge performance, an anode comprising same, and a method for manufacturing same, in which the anode active material is manufactured by modifying the surface of natural graphite particles. The natural graphite particles have a Dmax/Dmin value of 1.6 to 2.1 in the particle size distribution thereof and have, formed in the surface thereof, pores having a diameter of 0.5 ?m to 2.0 ?m.
    Type: Application
    Filed: January 17, 2020
    Publication date: April 29, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Hee Won CHOI, Je Young KIM, Sang Wook WOO, Li Lin PIAO
  • Patent number: 10964946
    Abstract: The present invention relates to an anode active material including natural graphite and mosaic coke-based artificial graphite, and a lithium secondary battery including the same. According to an embodiment of the present invention, an anode active material including natural graphite and mosaic coke-based artificial graphite is used, when applied to a lithium secondary battery, intercalation and deintercalation of lithium ions is more facilitated and conductivity of an electrode is improved even if no or little conductive material is used. Furthermore, the increase in conductivity can lead to not only a further improvement in rate performance of a lithium secondary battery but also a reduction in interfacial resistance.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: March 30, 2021
    Inventors: Su Min Lee, Dong Sub Jung, Eun Kyung Kim, Sang Wook Woo, Sun Young Shin
  • Publication number: 20210083273
    Abstract: A negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode are disclosed. The negative electrode includes a negative electrode current collector, a first negative electrode active material layer present on the negative electrode current collector, and a second negative electrode active material layer present on the first negative electrode active material layer. The first negative electrode active material layer includes two or more kinds of first negative electrode active materials, and the second negative electrode active material layer includes a second negative electrode active material having swelling that is smaller than that of the first negative electrode active material layer. Therefore, the surface of the negative electrode does not exhibit deformation during pre-lithiation.
    Type: Application
    Filed: October 11, 2018
    Publication date: March 18, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Jun Hyuk SONG, Oh Byong CHAE, Eun Kyung KIM, Sang Wook WOO
  • Publication number: 20210066703
    Abstract: A method for pre-lithiation of a negative electrode for a secondary battery, for reducing the time required for pre-lithiation and reducing changes in volume of the electrode. The method includes immersing a negative electrode for a secondary battery in the electrolyte to perform electrolyte impregnation, and pre-lithiating the negative electrode. Immersing the negative electrode for the secondary battery in an electrolyte includes introducing the prepared negative electrode into an electrolyte bath containing the electrolyte, and removing air bubbles and moisture in the negative electrode by applying a vacuum to the electrolyte bath in which the negative electrode is immersed.
    Type: Application
    Filed: January 30, 2020
    Publication date: March 4, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Ye Ri KIM, Sang Wook WOO, Oh Byong CHAE
  • Publication number: 20210043940
    Abstract: A negative electrode for a lithium secondary battery, a method of producing the negative electrode, and a lithium secondary battery including the negative electrode. Specifically, the negative electrode can reduce the initial irreversibility of the negative electrode because lithium metal ions are diffused into the negative electrode active material layer by pre-lithiation, and the negative electrode active material layer into which the lithium metal ions are diffused includes a plurality of line-shaped concave portions, so that when the lithium secondary battery is produced later, the concave portion keeps an electrolyte solution therein well to improve the impregnability of the electrolyte solution, thereby ultimately improving the electrochemical performance of the lithium secondary battery.
    Type: Application
    Filed: March 18, 2019
    Publication date: February 11, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Je Young KIM
  • Publication number: 20210036314
    Abstract: A negative electrode for a lithium secondary battery, a method of producing the negative electrode, a method of producing a pre-lithiated negative electrode by pre-lithiation of the negative electrode, and a lithium secondary battery including the negative electrode. The negative electrode can increase the capacity of a battery and improve the electrochemical performance by securing the initial reversibility of a negative electrode by pre-lithiation, and allow lithium ions to be diffused into a negative electrode active material layer during pre-lithiation without being lost.
    Type: Application
    Filed: March 18, 2019
    Publication date: February 4, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Je Young KIM
  • Patent number: 10886514
    Abstract: The present invention relates to a separator for a lithium secondary battery, including a porous resin comprising one or more polar functional groups selected from the group consisting of —C—F; and —C—OOH and —C?O on a surface thereof, wherein, among the polar functional groups, a molar ratio of —C—OOH and —C?O to —C—F ranges from 0.2:0.8 to 0.8:0.2, and a method of manufacturing the same.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: January 5, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Sang Wook Woo, Oh Byong Chae, Hee Won Choi, Eun Kyung Kim
  • Publication number: 20200411843
    Abstract: Provided is a solid state battery which solves the problems of the conventional solid state battery, and is effectively inhibited from a dimensional change caused by charging/discharging, an increase in internal resistance and degradation of charging/discharging characteristics or cycle life at a high current. The solid state battery is provided with an electrode active material layer including a negative electrode active material, a solid electrolyte and a conductive material, wherein the negative electrode active material includes a carbonaceous material and the carbonaceous material includes a plurality of pores, a porosity of 10-60 vol %, and a pore size of 100-300 nm based on the largest diameter of the pores.
    Type: Application
    Filed: October 22, 2018
    Publication date: December 31, 2020
    Applicant: LG Chem, Ltd.
    Inventors: Jun-Hyuk Song, Eun-Kyung Kim, Sang-Wook Woo, Jung-Pil Lee