Patents by Inventor Ju Hyeon AHN

Ju Hyeon AHN 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 polyetherketoneketone and polyetherketoneketone prepared thereby
    Patent number: 11919999
    Abstract: Provided are a method for preparing a polyetherketoneketone and a polyetherketoneketone prepared thereby, wherein, at the time of a polymerization reaction, nitrogen gas is blown into a liquid reaction medium while stirring, thereby quickly removing hydrochloric acid, which is a by-product generated during the reaction, and preventing aggregation of resin particles, thus suppressing the generation of scales.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: March 5, 2024
    Assignee: HANWHA CHEMICAL CORPORATION
    Inventors: Kwang Seok Jeong, Min Sung Kim, Jae Heon Kim, Ju Young Park, Cho Hee Ahn, Byeong Hyeon Lee, Sang Hyun Cho
  • Sodium vanadium oxide anode material for sodium ion secondary battery, preparation method thereof and sodium ion secondary battery having the same
    Patent number: 9166225
    Abstract: There is provided a preparation method of a sodium vanadium oxide-based (Na1+xV1?xO2) anode material for a sodium ion secondary battery synthesized by mixing particles of precursors such as sodium carbonate (Na2CO3) and vanadium oxide (V2O3) and pyrolyzing a mixture in a mixed gas atmosphere composed of 90 mol % of nitrogen gas and 10 mol % of hydrogen gas through a solid-state reaction. The sodium vanadium oxide-based anode material prepared according to the present invention shows a small change in volume caused by an initial irreversible capacity and continuous charge/discharge reactions, and thus it is useful for providing a next-generation sodium ion secondary battery having stable charge/discharge characteristics and cycle performance.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: October 20, 2015
    Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Hyung Sun Kim, Byung Won Cho, Si Hyoung Oh, Ju Hyeon Ahn, Yong Ho Lee, Won Chang Choi
  • SODIUM VANADIUM OXIDE ANODE MATERIAL FOR SODIUM ION SECONDARY BATTERY, PREPARATION METHOD THEREOF AND SODIUM ION SECONDARY BATTERY HAVING THE SAME
    Publication number: 20140363739
    Abstract: There is provided a preparation method of a sodium vanadium oxide-based (Na1+xV1-xO2) anode material for a sodium ion secondary battery synthesized by mixing particles of precursors such as sodium carbonate (Na2CO3) and vanadium oxide (V2O3) and pyrolyzing a mixture in a mixed gas atmosphere composed of 90 mol % of nitrogen gas and 10 mol % of hydrogen gas through a solid-state reaction. The sodium vanadium oxide-based anode material prepared according to the present invention shows a small change in volume caused by an initial irreversible capacity and continuous charge/discharge reactions, and thus it is useful for providing a next-generation sodium ion secondary battery having stable charge/discharge characteristics and cycle performance.
    Type: Application
    Filed: August 14, 2013
    Publication date: December 11, 2014
    Applicant: Korea Institute Of Science And Technology
    Inventors: Hyung Sun KIM, Byung Won CHO, Si Hyoung OH, Ju Hyeon AHN, Yong Ho LEE, Won Chang CHOI