Patents by Inventor In Wook NAH

In Wook NAH 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
  • Patent number: 10350713
    Abstract: A flux formulation includes an activator and a protic solvent. The activator may be glutaric acid, levulinic acid, 2-ketobutyric acid, 2-oxovaleric acid, or mixtures thereof. Suitable protic solvents include alkanediol, alkoxy propanol and alkoxy ethanol. The flux formulation may be a no-clean flux formulation that may be used in the soldering of electronic circuit board assemblies, for example, in conjunction with a support fixture having a planar back surface that minimizes vibrations during processing that might otherwise cause misalignment between a chip and a substrate prior to solder reflow.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: July 16, 2019
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Victor Alvarez, Pierre Y. Beaulieu, Kang-Wook Lee, Jae-Woong Nah, Lavanya Turlapati
  • 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: 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
  • Publication number: 20170065966
    Abstract: Disclosed are a modified catalyst for converting ortho-hydrogen to para-hydrogen, in which a metal active material capable of converting ortho-hydrogen to para-hydrogen is coated on a surface of a porous support, a method for preparing the same, and an apparatus and a method for converting ortho-hydrogen to para-hydrogen in hydrogen gas using the same. Accordingly, a pressure drop may be prevented and impurities in hydrogen gas may also be simultaneously removed when ortho-hydrogen is converted to para-hydrogen, and a stable reaction operation may be enabled.
    Type: Application
    Filed: September 7, 2016
    Publication date: March 9, 2017
    Applicant: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: In Wook NAH, Sarng Woo KARNG, In Hwan OH, Kang Bong LEE, Jung Hyun KIM
  • Publication number: 20120133498
    Abstract: The changing of the azimuth of directivity in which the azimuth of directivity of the antenna that achieves the maximum gain thereof is switched to the azimuths of tires is performed repeatedly for a plurality of cycles during a transmission duration of information. The output value of the antenna whose azimuth of directivity is controlled is sampled separately for each of the azimuths of directivity subjected to the switching. The sampled values are sorted into groups separately for each azimuth of directivity, and are accumulated separately for each group. The position of the tire shown by the azimuth of directivity of the group whose accumulated value is the largest is determined as being the position of the tire equipped with the transmitter that is transmitting the information.
    Type: Application
    Filed: April 6, 2010
    Publication date: May 31, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Seung Wook Nah, Toshiaki Watanabe, Junya Muramatsu, Nobuhiro Ide