Patents by Inventor Yoon-Jeong Heo

Yoon-Jeong Heo 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: 8367247
    Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics.
    Type: Grant
    Filed: November 11, 2008
    Date of Patent: February 5, 2013
    Assignees: Daejung EM Co., Ltd., Kokam Co., Ltd.
    Inventors: Seong-Bae Kim, Woo-Seong Kim, Yoon-Jeong Heo, Sung-Tae Ko, Ji-Jun Hong
  • Publication number: 20120225344
    Abstract: Disclosed is a separator for a lithium secondary battery and a lithium secondary battery comprising the same. The separator may include a thermoplastic polyolefin-based polymer porous sheet and an aramid-based non-woven fabric sheet stacked on at least one surface of the polyolefin-based polymer porous sheet, wherein the polyolefin-based polymer sheet and the aramid-based non-woven fabric sheet are adhered with an adhesive, and the adhesive loses an adhesive performance at 80° C. or more to separate the two sheets. The separator has a shut-down function and excellent high-temperature shape stability.
    Type: Application
    Filed: May 11, 2012
    Publication date: September 6, 2012
    Applicant: Kokam Co., Ltd.
    Inventors: Ji-Jun Hong, In-Beom Hwang, Sung-Tae Ko, Kwang-Hyun Kim, Yoon-Jeong Heo
  • Publication number: 20120135303
    Abstract: The present invention relates to a core-shell type anode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery comprising the same. The anode active material for a lithium secondary battery according to the present invention comprises a carbon based material core portion; and a shell portion formed outside of the carbon based material core portion by coating the carbon based material core portion with a spinel-type lithium titanium oxide. The anode active material for a lithium secondary battery according to the present invention has the metal oxide shell portion, and thus has the improved conductivity, a high output density, and consequently excellent electrical characteristics.
    Type: Application
    Filed: November 6, 2007
    Publication date: May 31, 2012
    Applicant: KOKAM CO., LTD.
    Inventors: Ji-Jun Hong, Sung-Tae Ko, Yoon-Jeong Heo
  • Publication number: 20110244322
    Abstract: Provided are a core-shell type anode active material for lithium secondary batteries including a carbonaceous material core; and a shell formed outside the carbonaceous material core, the shell including a PTC (Positive Temperature Coefficient) medium. The core-shell type anode active material for lithium secondary batteries has the shell including the PTC medium, and thus has the improved conductivity and high output density, exhibiting excellent electrical characteristics. And, a lithium secondary battery manufactured using the anode active material has excellent safety, in particular safety against overcharge and external short circuit.
    Type: Application
    Filed: December 16, 2008
    Publication date: October 6, 2011
    Applicant: KOKAM CO., LTD.
    Inventors: Ji-Jun Hong, Sung-Tae Ko, Yoon-Jeong Heo
  • Publication number: 20110052991
    Abstract: Disclosed are a cathode active material for lithium secondary batteries, a method for preparing the same, and lithium secondary batteries comprising the same. The cathode active material for lithium secondary batteries comprises a lithium metal oxide secondary particle core formed by aggregation of a plurality of lithium metal oxide primary particles; a first shell formed by coating the surface of the secondary particle core with a plurality of barium titanate particles and a plurality of metal oxide particles; and a second shell formed by coating the surface of the first shell with a plurality of olivine-type lithium iron phosphate oxide particles and a plurality of conductive material particles. The cathode active material for lithium secondary batteries allows manufacture of lithium secondary batteries having excellent thermal stability, high-temperature durability and overcharge safety.
    Type: Application
    Filed: November 25, 2009
    Publication date: March 3, 2011
    Applicants: DAEJUNG EM CO., LTD., KOKAM CO., LTD.
    Inventors: Seong-Bae Kim, Woo-Seong Kim, Ki-Sup Song, Ji-Jun Hong, Sung-Tae Ko, Yoon-Jeong Heo
  • Publication number: 20100310940
    Abstract: A cathode active material for a lithium secondary battery includes a lithium metal oxide secondary particle core formed by agglomerating lithium metal oxide primary particles; and a shell formed by coating the secondary particle core with barium titanate and metal oxide. This cathode active material allows making a lithium secondary battery having improved safety, particularly in thermal stability and overcharging characteristics.
    Type: Application
    Filed: November 11, 2008
    Publication date: December 9, 2010
    Applicants: DAEJUNG EM CO., LTD., KOKAM CO., LTD.
    Inventors: Seong-Bae Kim, Woo-Seong Kim, Yoon-Jeong Heo, Sung-Tae Ko, Ji-Jun Hong
  • Publication number: 20100203388
    Abstract: The present invention relates to a cathode active material for lithium secondary batteries with high safety, a method of preparing the same and lithium secondary batteries comprising the same. The cathode active material of the present invention comprises a lithium metal oxide secondary particle core portion formed by aggregation of lithium metal oxide primary particles; and a shell portion formed by coating the secondary particle core portion with an olivine-structured lithium iron phosphate oxide. The cathode active material of the present invention allows to manufacture lithium secondary batteries with improved safety, especially overcharge characteristics.
    Type: Application
    Filed: October 31, 2007
    Publication date: August 12, 2010
    Applicants: DAEJUNG EM CO., LTD., KOKAM CO., LTD.
    Inventors: Seong-Bae Kim, Woo-Seong Kim, Ji-Jun Hong, Sung-Tae Koh, Yoon-Jeong Heo