Patents by Inventor Oh Byong Chae

Oh Byong Chae 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
  • Patent number: 11165055
    Abstract: A negative electrode active material which may dramatically improve stability of a battery while not degrading battery performance such as cycle characteristics, and a negative electrode and a lithium secondary battery which include the same, wherein the negative electrode active material includes negative electrode active material particles which include artificial graphite in the form of a secondary particle and a carbon layer formed on the surface of the artificial graphite, and a coating layer which is formed on the negative electrode active material particle and includes a compound represented by Formula 1.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: November 2, 2021
    Assignee: LG CHEM, LTD.
    Inventors: Dong Sub Jung, Oh Byong Chae, Eun Kyung Kim, Ju Ho Chung, Chang Ju Lee
  • 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: 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: 20210234161
    Abstract: A negative electrode active material including a core including silicon, and a coating layer disposed on the core and including a coating material, wherein the coating material includes at least one selected from the group consisting of LiaVbO2 and MgH2, wherein 0.5<a<1.5 and 0.5<b<1.5 is provided.
    Type: Application
    Filed: May 9, 2019
    Publication date: July 29, 2021
    Applicant: LG CHEM, LTD.
    Inventors: Jun Hyuk SONG, Oh Byong CHAE, Je Young KIM, Yong Ju LEE
  • 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: 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: 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: 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: 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: 20200373553
    Abstract: A method for manufacturing a negative electrode, the method including immersing a preliminary negative electrode in a pre-lithiation solution, the pre-lithiation solution including a lithium organic compound and a pre-lithiation solvent, taking the preliminary negative electrode out of the pre-lithiation solution and then removing pre-lithiation solvent present in the preliminary negative electrode, wherein the preliminary negative electrode includes a current collector and a preliminary negative electrode active material layer on the current collector, the preliminary negative electrode active material layer includes a negative electrode active material, and a standard reduction potential of the lithium organic compound is lower than a standard reduction potential of the negative electrode active material.
    Type: Application
    Filed: March 6, 2019
    Publication date: November 26, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Je Young KIM
  • Publication number: 20200335769
    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 the negative electrode by pre-lithiation, and allow lithium ions to be diffused into the negative electrode active material layer during pre-lithiation without being lost.
    Type: Application
    Filed: March 18, 2019
    Publication date: October 22, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Je Young KIM
  • Patent number: 10811670
    Abstract: A method for manufacturing an electrode for a lithium secondary battery having reinforced safety is provided. In some embodiments, the method includes spraying a first mixture on a surface of an active material layer to form an insulating layer, wherein the insulating layer is a porous film and consists of a polymer or consists of the polymer and a first binder material, spraying a second mixture on the insulating layer to form a safety reinforcing layer, wherein the safety reinforcing layer consists of the second binder material and the inorganic oxide, and spraying a third mixture comprising microfilaments and a third binder material on the safety reinforcing layer to form an impregnation property improving layer, wherein a weight ratio of the microfilaments to the third binder material ranges from 10:90 to 30:70, and wherein the microfilaments have diameters of 0.1 to 10 ?m and lengths of 50 to 500 ?m.
    Type: Grant
    Filed: September 19, 2016
    Date of Patent: October 20, 2020
    Assignee: LG Chem, Ltd.
    Inventors: Oh Byong Chae, Su Min Lee, Eun Kyung Kim, Sun Young Shin
  • Patent number: 10804539
    Abstract: A negative electrode for a lithium-metal secondary battery and a lithium-metal secondary battery including the same are provided which have an excellent life characteristic and have less irregular resin phases formed on the surface the negative electrode. The negative electrode includes a polymer layer arranged in a lattice structure having vacant spaces, so that the specific surface area of the negative electrode can be increased, a uniform current density distribution can thereby be achieved, the negative electrode has excellent life characteristics, and the formation of irregular resin phases can be suppressed.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: October 13, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Hee Won Choi, Sang Wook Woo, Oh Byong Chae, Eun Kyung Kim
  • Publication number: 20200321612
    Abstract: The present invention provides a negative electrode for a lithium secondary battery, which includes a negative electrode current collector; and a negative electrode active material layer which is formed on the negative electrode current collector and includes a negative electrode active material including a silicon-based material, wherein the negative electrode active material includes lithium intercalated by pre-lithiation, and the extent of pre-lithiation of the negative electrode active material, calculated by a specific equation, is 5 to 50%.
    Type: Application
    Filed: February 21, 2019
    Publication date: October 8, 2020
    Applicant: LG CHEM, LTD.
    Inventors: Oh Byong CHAE, Sang Wook WOO, Je Young KIM
  • Patent number: 10797309
    Abstract: The present invention relates to a negative electrode active material comprising a mixture of a first negative electrode active material and a second negative electrode active material, wherein the first negative electrode active material has a hardness of 1 kg/mm2 to 10 kg/mm2 on the basis of the Vickers hardness standard, and the second negative electrode active material has a higher hardness than the first negative electrode active material. The negative electrode active material according to the present invention comprises a mixture of negative electrode active materials having different hardness so that pores of an active material layer are maintained in spite of a rolling process at the time of producing an negative electrode, and the pores acting as an electrolyte flow passage of an electrode can effectively be secured, thereby producing a lithium secondary battery having excellent battery performance by lowering resistance when a battery is charged or discharged.
    Type: Grant
    Filed: November 11, 2016
    Date of Patent: October 6, 2020
    Assignee: LG CHEM, LTD.
    Inventors: Oh Byong Chae, Su Min Lee, Eun Kyung Kim, Sun Young Shin