Patents by Inventor Ha Kyung Roh

Ha Kyung Roh 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).

  • Composite for positive electrode active material of secondary battery, secondary battery including same, and method for preparing same
    Patent number: 11837715
    Abstract: The present disclosure provides a composite wherein NaCl nanoparticles are uniformly dispersed on reduced graphene oxide (rGO), a positive electrode active material including the same, a sodium secondary battery including the same, and a method for preparing the same. The positive electrode active material according to the present disclosure has a structure wherein NaCl nanoparticles are uniformly dispersed on rGO in a one-step process through chemical self-assembly. Therefore, the positive electrode active material according to the present disclosure exhibits superior electrochemical properties with high capacity because the small NaCl particles are dispersed uniformly and is economically favorable because the preparation process is simple.
    Type: Grant
    Filed: February 18, 2021
    Date of Patent: December 5, 2023
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyung Yoon Chung, Ha Kyung Roh, Moeez Iqra, Eun Seong Kim, Hun-Gi Jung, Won Young Chang
  • COMPOSITE FOR POSITIVE ELECTRODE ACTIVE MATERIAL OF SECONDARY BATTERY, SECONDARY BATTERY INCLUDING SAME, AND METHOD FOR PREPARING SAME
    Publication number: 20220181604
    Abstract: The present disclosure provides a composite wherein NaCl nanoparticles are uniformly dispersed on reduced graphene oxide (rGO), a positive electrode active material including the same, a sodium secondary battery including the same, and a method for preparing the same. The positive electrode active material according to the present disclosure has a structure wherein NaCl nanoparticles are uniformly dispersed on rGO in a one-step process through chemical self-assembly. Therefore, the positive electrode active material according to the present disclosure exhibits superior electrochemical properties with high capacity because the small NaCl particles are dispersed uniformly and is economically favorable because the preparation process is simple.
    Type: Application
    Filed: February 18, 2021
    Publication date: June 9, 2022
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Kyung Yoon CHUNG, Ha Kyung ROH, Moeez IQRA, Eun Seong KIM, Hun-Gi JUNG, Won Young CHANG
  • Negative active material for sodium secondary battery, method for preparing thereof and sodium secondary battery using the same
    Patent number: 10305098
    Abstract: Sodium negative active material may have a metal phosphate having a uniform size distribution structures to graphene surface. The negative active material is a metal or a metal oxide precursor in a graphite dispersion solution; And the addition of phosphate, and then applying a microwave, can be produced by heat treatment.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: May 28, 2019
    Assignee: University-Industry Foundation, Yonsei University
    Inventors: Kwang Bum Kim, Ha Kyung Roh, Hyun Kyung Kim, Myeong Seong Kim
  • NEGATIVE ACTIVE MATERIAL FOR SODIUM SECONDARY BATTERY, METHOD FOR PREPARING THEREOF AND SODIUM SECONDARY BATTERY USING THE SAME
    Publication number: 20170155130
    Abstract: Sodium negative active material may have a metal phosphate having a uniform size distribution structures to graphene surface. The negative active material is a metal or a metal oxide precursor in a graphite dispersion solution; And the addition of phosphate, and then applying a microwave, can be produced by heat treatment.
    Type: Application
    Filed: October 19, 2016
    Publication date: June 1, 2017
    Inventors: Kwang Bum Kim, Ha Kyung Roh, Hyun Kyung Kim, Myeong Seong Kim