Patents by Inventor Hwang Yol RYU

Hwang Yol RYU 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).

  • Method for preparing cathode active material precursor for secondary battery, and preparation apparatus using same
    Patent number: 11827524
    Abstract: A method for preparing a cathode active material precursor for a secondary battery, including: moving a co-precipitation filtrate generated after a co-precipitation reaction to a co-precipitation filtrate storage tank; removing a metal hydroxide by passing the co-precipitation filtrate through a filter; reacting the co-precipitation filtrate from which the metal hydroxide is removed with sulfuric acid or nitric acid to produce an ammonium sulfate or an ammonium nitrate while removing ammonia from the co-precipitation filtrate from which the metal hydroxide is removed; cooling and crystallizing the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate a sodium sulfate; filtering the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the co-precipitation filtrate and moving the co-precipitation filtrate separated from t
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: November 28, 2023
    Assignees: POSCO HOLDINGS INC., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, POSCO FUTURE M CO., LTD.
    Inventors: Ki Sung You, Hwang Yol Ryu
  • METHOD FOR PREPARING CATHODE ACTIVE MATERIAL PRECURSOR FOR SECONDARY BATTERY, AND PREPARATION APPARATUS USING SAME
    Publication number: 20210163306
    Abstract: A method for preparing a cathode active material precursor for a secondary battery, including: moving a co-precipitation filtrate generated after a co-precipitation reaction to a co-precipitation filtrate storage tank; removing a metal hydroxide by passing the co-precipitation filtrate through a filter; reacting the co-precipitation filtrate from which the metal hydroxide is removed with sulfuric acid or nitric acid to produce an ammonium sulfate or an ammonium nitrate while removing ammonia from the co-precipitation filtrate from which the metal hydroxide is removed; cooling and crystallizing the co-precipitation filtrate from which the metal hydroxide and ammonia are removed to precipitate a sodium sulfate; filtering the precipitated sodium sulfate to separate the precipitated sodium sulfate from the co-precipitation filtrate from which the metal hydroxide and ammonia are removed; drying the sodium sulfate separated from the co-precipitation filtrate and moving the co-precipitation filtrate separated from t
    Type: Application
    Filed: June 19, 2018
    Publication date: June 3, 2021
    Inventors: Ki Sung You, Hwang Yol Ryu
  • APPARATUS FOR PRODUCING PRECURSOR HAVING CONCENTRATION GRADIENT AND MATERIAL INJECTION SCHEDULING METHOD THEREFOR
    Publication number: 20200373556
    Abstract: The present invention relates to a material injection scheduling method for producing a precursor having a concentration gradient using an apparatus for producing a precursor having a concentration gradient mixing materials of a first feed tank and a second feed tank with each other in advance in a mixer and injecting the mixed material into a reactor.
    Type: Application
    Filed: December 12, 2018
    Publication date: November 26, 2020
    Inventors: Hwang Yol RYU, Ki Sung YOU