Patents by Inventor Sei-Min PARK

Sei-Min PARK 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: 20240413331
    Abstract: It is related to a manufacturing method of a negative electrode active material for lithium secondary battery, comprising: preparing an artificial graphite; mixing the artificial graphite and a coal tar to form a coating layer on the artificial graphite; and carbonizing the artificial graphite on which the coating layer is formed, wherein, the artificial graphite has a degree of sphericity of 0.6 to 1; and in the step of preparing an artificial graphite, the artificial graphite contains 20 wt % or more of artificial graphite derived from coal-based coke.
    Type: Application
    Filed: December 20, 2021
    Publication date: December 12, 2024
    Applicants: POSCO Holdings Inc., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, POSCO CHEMICAL CO., LTD
    Inventors: Gang Ho LEE, Jung-Chul AN, Sei Min PARK, Jong Hoon YOON, Hyun-Chul JO
  • Publication number: 20240055604
    Abstract: It is related to a manufacturing method of negative electrode active material for lithium secondary battery, comprising: preparing an artificial graphite; forming a coating layer covering the artificial graphite by mixing the artificial graphite and a liquid coating material; and carbonizing the artificial graphite on which the coating layer is formed; wherein, the liquid coating material has a viscosity of 300 to 25000 mPa s at 35° C.; a negative electrode active material according to the method; and a lithium secondary battery including the same.
    Type: Application
    Filed: December 20, 2021
    Publication date: February 15, 2024
    Applicants: POSCO HOLDINGS INC., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, POSCO CHEMICAL CO., LTD
    Inventors: Gang Ho LEE, Jung-Chul AN, Sei Min PARK, Jong Hoon YOON, Hyun-Chul JO
  • Publication number: 20240051831
    Abstract: A present disclosure is related to a method of manufacturing a negative electrode active material for lithium secondary battery: preparing a primary particle by grinding a carbon source containing 10 to 25 wt % volatile matter; heating and kneading the primary particle to assemble them into a secondary particle; and graphitizing the secondary particle; wherein, the step of assembling the secondary particle is the step of heating and kneading only the primary particle without adding a binder. In addition, it is provided a negative electrode active material for a lithium secondary battery has a retention of 80% discharge capacity of 20 cycles or more.
    Type: Application
    Filed: February 3, 2021
    Publication date: February 15, 2024
    Inventors: Gang Ho LEE, Sei Min PARK, Jung-Chul AN, Jong Hoon YOON, Hyun-Chul JO
  • Publication number: 20230420675
    Abstract: The present disclosure relates to a manufacturing method of a negative active material for a battery, a negative active material manufactured therefrom, and a lithium secondary battery including the negative electrode, including: the steps of coating a base material for a negative active material with a coating material; and heating the obtained coating product; wherein, the coating material is graphitizable carbon, the softening point is 50° C. or less, and the coating material is included so that the residual carbon amount is 1 to 5 parts by weight with respect to 100 parts by weight of the base material for the negative active material.
    Type: Application
    Filed: November 17, 2021
    Publication date: December 28, 2023
    Applicants: POSCO Holdings Inc., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Moonkyu CHO, Gang Ho LEE, Sei Min PARK, Jung-Chul AN, Seung Jae YOU, Jung Gyu WOO, Hyun-Chul JO, Jong Hoon YOON
  • Publication number: 20230045738
    Abstract: The present disclosure relates to a method of manufacturing an anode active material for a lithium secondary battery, the method including: mixing earth graphite and pitch coke with each other; preparing a raw material by adding and mixing a binder to the mixture; performing heat treatment on the raw material; graphitizing the heat-treated mixture to obtain a core part; immersing the core part in a hard carbon coating solution; and drying the coating solution in which the core part is immersed to obtain an anode active material.
    Type: Application
    Filed: December 15, 2020
    Publication date: February 9, 2023
    Applicants: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Gang Ho LEE, Sei Min PARK, Jung-Chul AN, Jong Hoon YOON, Hyun-Chul JO
  • Publication number: 20220077466
    Abstract: The present invention relates to a negative electrode active material of a lithium secondary battery, a manufacturing method thereof, and a lithium secondary battery using the same. An embodiment of the present invention provides a negative electrode active material for a lithium secondary battery, including a graphite material including secondary particles, wherein the secondary particles are an assembly of a plurality of primary particles, the primary particles include green coke, and a ratio ((D90?D10)/D50) of a difference between a particle diameter D90 and a particle diameter D10 with respect to a particle diameter D50 of the secondary particles is 1.0 to 1.32.
    Type: Application
    Filed: December 6, 2019
    Publication date: March 10, 2022
    Inventors: Jung-Chul AN, Sei Min PARK, Gang Ho LEE, Moonkyu CHO, Byoung Ju KIM, Jong Hoon YOON, Hyun-Chul JO
  • Publication number: 20210143425
    Abstract: Presented is a method for producing a negative electrode active material which has a high discharge capacity, high charge-discharge efficiency, and excellent high-output characteristics, and which experiences only a small volume change during charging/discharging. A method for producing a negative electrode active material for a lithium secondary battery according to an embodiment of the present invention includes: a step for producing primary particles by pulverizing a carbon raw material containing 4 to 10 wt % of volatile matters; a step for producing secondary particles by mixing the primary particles with a binder; and a step for producing a graphite material by graphitizing the secondary particles.
    Type: Application
    Filed: August 1, 2018
    Publication date: May 13, 2021
    Inventors: Jung-Chul An, Sei Min Park, Jae Eun Lee, Byoung Ju Kim, Seung Jae You, Hyoung Geun Kim, Sang Eun Lee, Chan Woo Lee, Hyun-Chul Jo, Myung Ki Kim
  • Patent number: 9873242
    Abstract: The present invention relates to a method for preparing a continuous carbon fiber-reinforced thermoplastic prepreg, and more specifically, to a method for preparing a continuous carbon fiber-reinforced thermoplastic semi-prepreg or prepreg, comprising the steps of: providing a plurality of carbon fibers having an increased width; preparing a layered product by arranging a thermoplastic film on at least a part of the upper and lower portions of the carbon fibers having an increased width; and preparing a joined product by joining the thermoplastic film and the carbon fibers comprising the layered body.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: January 23, 2018
    Assignees: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Il-Joon Bae, Ik-Pyo Hong, Sei-Min Park, Sung-Young Lee
  • Publication number: 20150336369
    Abstract: The present invention relates to a method for preparing a continuous carbon fiber-reinforced thermoplastic prepreg, and more specifically, to a method for preparing a continuous carbon fiber-reinforced thermoplastic semi-prepreg or prepreg, comprising the steps of: providing a plurality of carbon fibers having an increased width; preparing a layered product by arranging a thermoplastic film on at least a part of the upper and lower portions of the carbon fibers having an increased width; and preparing a joined product by joining the thermoplastic film and the carbon fibers comprising the layered body.
    Type: Application
    Filed: December 24, 2013
    Publication date: November 26, 2015
    Applicants: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Il-Joon BAE, Ik-Pyo HONG, Sei-Min PARK, Sung-Young LEE