Patents by Inventor Mun Sek KIM

Mun Sek KIM 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: 10840514
    Abstract: The present disclosure relates to an aqueous binder for a lithium-sulfur secondary battery, a method for preparing the same, and a lithium-sulfur secondary battery including the same. More particularly, it is possible to obtain an aqueous binder (PEI/PVP/CA, PPC) by adding citric acid to a mixed solution of polyethylene imine with polyvinyl pyrrolidone, and to apply the aqueous binder to a lithium-sulfur secondary battery having high discharge capacity, Coulombic efficiency and stable life characteristics through the improvement of adhesion capability even at a sulfur cathode with high energy density, inhibition of a shuttle reaction and inhibition of metal current collector corrosion.
    Type: Grant
    Filed: February 14, 2019
    Date of Patent: November 17, 2020
    Assignee: Korea Institute of Science and Technology
    Inventors: Won Il Cho, Van Dung Do, Mun Sek Kim, In Wook Nah, Min Seop Kim
  • Patent number: 10804567
    Abstract: Disclosed is an electrolyte for a lithium metal secondary battery and a lithium metal secondary battery including the same. An electrolyte system is intended to maintain the energy density of a secondary battery based on a lithium metal negative electrode and to extend the life of a battery. Particularly, an electrolyte for a lithium metal battery which forms a stable SEI film capable of inhibiting formation and extension of lithium dendrite so that the negative electrode of a lithium metal battery having a high possibility of battery ignition may be stabilized and an internal short-circuit may be prevented, and a lithium metal secondary battery including the same is provided.
    Type: Grant
    Filed: May 9, 2018
    Date of Patent: October 13, 2020
    Assignee: Korea Institute of Science and Technology
    Inventors: Won Il Cho, Mun Sek Kim, Ji Hyun Ryu, In Wook Nah, Min Seop Kim, Sun Min Park
  • Patent number: 10727466
    Abstract: In a secondary battery including a separator, the improvement includes a coating layer that is disposed on the separator and that comprises a polyethyleneimine-attached carbonaceous material The secondary battery may include an adhesive buffer layer provided between the separator and the coating layer which imparts adhesion force between the separator and the coating layer. The carbonaceous material adsorbs lithium polysulfides (LiPS) in use to inhibit a shuttling reaction between the anode and the cathode, caused by the dissolution of lithium polysulfides in the electrolyte, and increases recyclability of the lithium polysulfides, resulting in improvement of life characteristics and rate characteristics of the secondary battery.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: July 28, 2020
    Assignee: Korea Institute of Science and Technology
    Inventors: Won Il Cho, Mun Sek Kim, In Wook Nah, Young Rok Lim, Sun Min Park, In Hwan Oh
  • Patent number: 10658670
    Abstract: An anode includes a thin film of an anode material; and a protective layer that is formed on the thin film of the anode material, that is composed of functionalized metal oxide nanoparticles, which are lithium-terminated sulfonated metal oxide nanoparticles, and that has a thickness of 300-5000 nm. A method for manufacturing the anode includes dispersing the functionalized metal oxide nanoparticles into a dispersion medium to form a dispersion; dipping a substrate into water, and introducing the dispersion thereto so that the functionalized metal oxide nanoparticles form a self-assembled molecular film on the water surface; lifting the substrate over the water surface to transfer the self-assembled molecular film onto the substrate, thereby providing a substrate coated with a functionalized metal oxide film; and transferring the functionalized metal oxide film onto the thin film of the anode material to provide an anode coated with the functionalized metal oxide film.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: May 19, 2020
    Assignee: Korea Institute of Science and Technology
    Inventors: Won Il Cho, In Wook Nah, In Hwan Oh, Van Dung Do, Mun Sek Kim
  • Publication number: 20200119355
    Abstract: The present disclosure relates to an aqueous binder for a lithium-sulfur secondary battery, a method for preparing the same, and a lithium-sulfur secondary battery including the same. More particularly, it is possible to obtain an aqueous binder (PEI/PVP/CA, PPC) by adding citric acid to a mixed solution of polyethylene imine with polyvinyl pyrrolidone, and to apply the aqueous binder to a lithium-sulfur secondary battery having high discharge capacity, Coulombic efficiency and stable life characteristics through the improvement of adhesion capability even at a sulfur cathode with high energy density, inhibition of a shuttle reaction and inhibition of metal current collector corrosion.
    Type: Application
    Filed: February 14, 2019
    Publication date: April 16, 2020
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Won Il CHO, Van Dung Do, Mun Sek Kim, In Wook Nah, Min Seop Kim
  • Publication number: 20190280304
    Abstract: The artificial solid electrolyte interphase of an anode for a secondary battery including multi-walled carbon nanotubes to protect an underlying anode material in the form of a thin film. The use of the artificial solid electrolyte interphase enables rapid diffusion and stable deposition of lithium to inhibit the formation of dendrites. In addition, the artificial solid electrolyte interphase prevents side reactions between the lithium metal anode and the electrolyte, achieving good electrochemical stability and high Coulombic efficiency.
    Type: Application
    Filed: March 7, 2019
    Publication date: September 12, 2019
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: WON IL CHO, Mun Sek KIM, Seung Hun LEE, Min Seop KIM, Van Dung DO, In Wook NAH, In Hwan OH
  • Publication number: 20190267630
    Abstract: The aim of the present invention is to provide an electrolyte system for prolonging the life of lithium metal anode-based secondary batteries while maintaining the energy density of the batteries. The ultimate aim of the present invention is to use lithium metal in combination with cathodes, such as transition metal oxide, sulfur, and air electrodes, that are currently used in lithium ion batteries for future unmanned electric vehicles and grid energy storage systems as well as in lithium metal secondary batteries with high energy density. The use of lithium metal is also expected to contribute to the development of newly emerging unmanned aircrafts such as drones. The present invention is expected to be globally competitive in the secondary battery and electrochemical capacitor industries.
    Type: Application
    Filed: February 26, 2019
    Publication date: August 29, 2019
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: WON IL CHO, Mun Sek KIM, Ji Hyun RYU, Seung Hun LEE
  • Patent number: 10243197
    Abstract: Provided is a lithium metal anode comprising a Langmuir-Blodgett films as an artificial solid electrolyte interface layer, a lithium metal battery comprising the same, and a preparation method thereof. Various ultra-thin film layers made of carbon and ceramic are formed on the surface of the LiM to serve as a stable artificial SEI layer and suppress formation and perforation of lithium dendrite and side reactions.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: March 26, 2019
    Assignees: Korean Institute of Science and Technology, Cornell University
    Inventors: Won Il Cho, Mun Sek Kim, In Wook Nah, Min Seop Kim, Lynden A. Archer, Snehashis Choudhury, Zhengyuan Tu
  • Publication number: 20180331393
    Abstract: Disclosed is an electrolyte for a lithium metal secondary battery and a lithium metal secondary battery including the same. An electrolyte system is intended to maintain the energy density of a secondary battery based on a lithium metal negative electrode and to extend the life of a battery. Particularly, an electrolyte for a lithium metal battery which forms a stable SEI film capable of inhibiting formation and extension of lithium dendrite so that the negative electrode of a lithium metal battery having a high possibility of battery ignition may be stabilized and an internal short-circuit may be prevented, and a lithium metal secondary battery including the same is provided.
    Type: Application
    Filed: May 9, 2018
    Publication date: November 15, 2018
    Applicant: Korea Institute of Science and Technology
    Inventors: Won Il CHO, Mun Sek Kim, Ji Hyun Ryu, In Wook Nah, Min Seop Kim, Sun Min Park
  • Publication number: 20180309109
    Abstract: Organized materials on a substrate. The organized materials are monolayer(s) of close-packed nanoparticles and/or microparticles. The organized materials can be formed by transfer of one or more monolayers to a substrate from a coating composition on which a monolayer of close-packed nanoparticles and/or microparticles is formed. Organized materials on a substrate can be used in devices such as, for example, batteries, capacitors, and wearable electronics.
    Type: Application
    Filed: December 12, 2016
    Publication date: October 25, 2018
    Inventors: Mun Sek KIM, Snehashis CHOUDHURY, Lin MA, Lynden A. ARCHER
  • Publication number: 20180269453
    Abstract: A polyethyleneimine-attached carbonaceous material for a separator for a secondary battery. The carbonaceous material for coating a separator for a secondary battery adsorbs lithium polysulfides (LiPS) to inhibit a shuttling reaction between an anode and a cathode, caused by the dissolution of lithium polysulfides in electrolyte, and increases recyclability of lithium polysulfides, resulting in improvement of life characteristics and rate characteristics of a battery.
    Type: Application
    Filed: December 19, 2017
    Publication date: September 20, 2018
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Won Il Cho, Mun Sek Kim, In Wook Nah, Young Rok Lim, Sun Min Park, In Hwan Oh
  • Publication number: 20180241042
    Abstract: Functionalized metal oxide nanoparticles which are lithium-terminated sulfonated metal oxide nanoparticles. According to the anode to which lithium-terminated sulfonated metal oxide nanoparticles are introduced as a protective layer, negatively charged sulfonate groups may cause electrostatic repulsion of lithium polysulfides and limit access of lithium polysulfides to a lithium metal anode while reducing the interfacial resistance by lithium fixed to sulfonate groups, inhibit growth of dendrites at a lithium metal anode and perforation of a separator, and the protective layer serves as an artificial solid electrolyte interphase (SEI) layer positioned on the surface of lithium metal and reducing the impedance to charge transfer reaction, thereby increasing the Coulomb efficiency of a lithium-sulfur battery. Thus, it is possible to improve the electrochemical characteristics, such as charge/discharge capacity, life and rate characteristics.
    Type: Application
    Filed: December 19, 2017
    Publication date: August 23, 2018
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Won IL CHO, In Wook NAH, In Hwan OH, Van Dung DO, Mun Sek KIM
  • Publication number: 20180123114
    Abstract: Provided is a lithium metal anode comprising a Langmuir-Blodgett films as an artificial solid electrolyte interface layer, a lithium metal battery comprising the same, and a preparation method thereof. Various ultra-thin film layers made of carbon and ceramic are formed on the surface of the LiM to serve as a stable artificial SEI layer and suppress formation and perforation of lithium dendrite and side reactions.
    Type: Application
    Filed: February 27, 2017
    Publication date: May 3, 2018
    Inventors: Won Il CHO, Mun Sek KIM, In Wook NAH, Min Seop KIM, Lynden A. ARCHER, Snehashis Choudhury, Zhengyuan Tu