Patents by Inventor Su Youn Kwon

Su Youn Kwon 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).

  • Publication number: 20240266519
    Abstract: Disclosed is a cathode active material including a particle core, a surface bulk portion formed in an outer direction of the particle core, and a surface portion formed in an outer direction of the surface bulk portion to constitute an outermost layer of the active material, wherein the surface portion contains a resistance-reducing element capable of reducing a resistance increase rate of the active material, and the surface bulk portion contains a structure-stabilizing element capable of improving the structural stability of the active material, and the structure-stabilizing element has higher diffusion power than that of the resistance-reducing element under calcination conditions for producing an active material.
    Type: Application
    Filed: November 5, 2021
    Publication date: August 8, 2024
    Inventors: Kyung Min KIM, Su Youn KWON, Jin Hyeon LIM, Sung Kyun CHANG, Doe Hyoung KIM
  • Patent number: 10903486
    Abstract: A positive active material for a rechargeable lithium battery, a method for manufacturing the same, and a rechargeable lithium battery including the same are provided. A positive active material for a rechargeable lithium battery includes a compound that is capable of reversibly intercalating or deintercalating lithium, wherein the compound is formed of a core portion and a coating layer, the core portion is doped with M, and the coating layer includes Al and B, wherein M is Zr, Ti, Mg, Ca, Al, B, V, Zn, Mo, Ni, Co, Mn, or a combination thereof.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: January 26, 2021
    Assignee: L&F CO., LTD.
    Inventors: Su An Choi, Sang Hoon Jeon, Chang Min Choi, Su Youn Kwon, Jeong A Gu, Bong Jun Jeong
  • Patent number: 10673071
    Abstract: In an embodiment of the present invention, a positive active material for a lithium secondary battery is represented by Formula 1, and includes a core including a compound having a core portion and a surface portion, and the compound has a lower L3/L2 intensity ratio of Ni in the surface portion than an L3/L2 intensity ratio of Ni in the core portion. Li[LizA(1-z-a)Da]EbO2-b??[Formula 1] (In the above formula (1), A is Ni?Co?Mn?, D is at least one element selected from the group consisting of Na, K, Mg, Ca, Sr, Ni, Co, Ti, Al, B, Si, Sn, Mn, Cr, Fe, V, Zr, Nb, and Mo, E is at least one element selected from the group consisting of P, F, and S, ?0.05?z?0.1, 0?a?0.05, 0?b?0.05, 0.3???0.9, 0.05???0.4, and 0.05???0.4.) (The L3/L2 intensity ratio of Ni is the oxidation number of Ni measured by electronic energy loss spectroscopy (EELS).).
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: June 2, 2020
    Assignee: L&F CO., LTD.
    Inventors: Su An Choi, Sang Hoon Jeon, Su Youn Kwon, Mi Hye Yun, Yu Jin Sohn, Ji Sun An, Bong Jun Jeong
  • Publication number: 20190131624
    Abstract: In an embodiment of the present invention, a positive active material for a lithium secondary battery is represented by Formula 1, and includes a core including a compound having a core portion and a surface portion, and the compound has a lower L3/L2 intensity ratio of Ni in the surface portion than an L3/L2 intensity ratio of Ni in the core portion. Li[LizA(1-z-a)Da]EbO2-b ??[Formula 1] (In the above formula (1), A is Ni?Co?Mn?, D is at least one element selected from the group consisting of Na, K, Mg, Ca, Sr, Ni, Co, Ti, Al, B, Si, Sn, Mn, Cr, Fe, V, Zr, Nb, and Mo, E is at least one element selected from the group consisting of P, F, and S, ?0.05?z?0.1, 0?a?0.05, 0?b?0.05, 0.3???0.9, 0.05???0.4, and 0.05???0.4.) (The L3/L2 intensity ratio of Ni is the oxidation number of Ni measured by electronic energy loss spectroscopy (EELS).
    Type: Application
    Filed: March 2, 2017
    Publication date: May 2, 2019
    Inventors: Su An Choi, Sang Hoon Jeon, Su Youn Kwon, Mi Hye Yun, Yu Jin Sohn, Ji Sun An, Bong Jun Jeong
  • Publication number: 20180026266
    Abstract: Provided is a positive active material for a lithium secondary battery, which is a compound capable of reversible intercalation and deintercalation of lithium and having secondary particles formed by the aggregation of primary particles, wherein the size of crystal grains is between 0.0593 and 0.0610 ?m at a (003) peak in the spectrum analysis of X-ray diffraction analysis.
    Type: Application
    Filed: February 1, 2016
    Publication date: January 25, 2018
    Inventors: Su An Choi, Ho Jun Jeong, Sang Hoon Jeon, Su Youn Kwon, Ji Sun An, Bong Jun Jeong
  • Publication number: 20160336595
    Abstract: A positive active material for a rechargeable lithium battery, a method for manufacturing the same, and a rechargeable lithium battery including the same are provided. A positive active material for a rechargeable lithium battery includes a compound that is capable of reversibly intercalating or deintercalating lithium, wherein the compound is formed of a core portion and a coating layer, the core portion is doped with M, and the coating layer includes Al and B, wherein M is Zr, Ti, Mg, Ca, Al, B, V, Zn, Mo, Ni, Co, Mn, or a combination thereof.
    Type: Application
    Filed: July 27, 2016
    Publication date: November 17, 2016
    Inventors: Su An CHOI, Sang Hoon JEON, Chang Min CHOI, Su Youn KWON, Jeong A. GU, Bong Jun JEONG
  • Publication number: 20160028082
    Abstract: A cathode active material for a rechargeable lithium battery and a rechargeable lithium battery including the same, wherein the cathode active material includes a compound being capable of intercalating and deintercallating lithium, wherein the compound consists of a core part and a coating layer, and the core part is doped with M1 and M2 while the coating layer includes B, are provided. The M1 and M2 are independently at least one metal selected from Zr, Ti, Mg, Ca, V, Zn, Mo, Ni, Co, and Mn, and M1 and M2 are different.
    Type: Application
    Filed: September 25, 2015
    Publication date: January 28, 2016
    Inventors: Su An Choi, Sang-Hoon Jeon, Su Youn Kwon, Jeong A Gu, Hyun Chul Jung, Sung Woo Cho, Bong Jun Jeong