Patents Assigned to POSCO CHEMTECH CO., LTD.
  • Patent number: 9466828
    Abstract: Disclosed is a method for preparing an electrode active material for a rechargeable lithium battery, including: performing first mixing to mix a carbon-based active material with a low crystalline carbon material; performing second mixing to mix the mixture of the carbon-based active material and the low crystalline carbon material with a ceramic; and performing a heat treatment, an electrode for a rechargeable lithium battery including the electrode active material for the rechargeable lithium battery prepared by the method, and a rechargeable lithium battery.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: October 11, 2016
    Assignee: POSCO CHEMTECH CO., LTD.
    Inventors: Mi Ryeong Lee, Heon Young Lee, Kyoung Muk Lee
  • Publication number: 20150155557
    Abstract: The present invention relates to a negative electrode active material for a rechargeable lithium battery, a method for preparing the same, and a rechargeable lithium battery using the same. This invention provides a negative electrode active material for a rechargeable lithium battery, comprising a highly crystalline spherical natural graphite, wherein a Raman R value is 0.03 or more and 0.15 or less, and an internal porosity (ml/g) is 0.15 or less. The Raman R value means that the intensity ratio R (R=Id/Ig) measured by the intensity Ig of peak Pg near the 1580 cm?1 and the intensity Id of peak Pd near the 1360 cm?1 in the Raman spectrum analysis.
    Type: Application
    Filed: May 13, 2014
    Publication date: June 4, 2015
    Applicant: POSCO CHEMTECH CO., LTD.
    Inventors: Se Mann KWON, Yong Tae Park
  • Publication number: 20150017524
    Abstract: Disclosed is an electrode active material for a rechargeable lithium battery, including: a core part including a carbon-based active material; and a coating layer disposed on a surface of the core portion to include a ceramic, wherein the surface of the core part is subjected to coating with a low crystalline carbon material, a method for preparing the same, an electrode including the same, and a rechargeable lithium battery including the electrode.
    Type: Application
    Filed: October 29, 2013
    Publication date: January 15, 2015
    Applicant: POSCO CHEMTECH CO., LTD.
    Inventors: Mi Ryeong Lee, Heon Young Lee, Kyoung Muk Lee, Hyun Ki Choi
  • Publication number: 20150017527
    Abstract: The present invention relates to a negative electrode active material for a rechargeable lithium battery, a method for preparing the same, and a rechargeable lithium battery using the same, and provides a negative electrode active material for a rechargeable lithium battery of a carbon-metal complex or a mixture type, containing a carbon-based active material including a first ceramic coating layer, a metal-based active material or a metal-base active material including a first ceramic coating layer, and a carbon-based active material.
    Type: Application
    Filed: November 15, 2013
    Publication date: January 15, 2015
    Applicant: POSCO CHEMTECH CO., LTD.
    Inventors: Kyoung Muk LEE, Heon Young LEE, Mi Ryeong LEE, Eun Byeol HYEONG
  • Publication number: 20150017525
    Abstract: Disclosed is a method for preparing an electrode active material for a rechargeable lithium battery, including: performing first mixing to mix a carbon-based active material with a low crystalline carbon material; performing second mixing to mix the mixture of the carbon-based active material and the low crystalline carbon material with a ceramic; and performing a heat treatment, an electrode for a rechargeable lithium battery including the electrode active material for the rechargeable lithium battery prepared by the method, and a rechargeable lithium battery.
    Type: Application
    Filed: October 29, 2013
    Publication date: January 15, 2015
    Applicant: POSCO CHEMTECH CO., LTD.
    Inventors: Mi Ryeong LEE, Heon Young Lee, Kyoung Muk Lee
  • Publication number: 20140356707
    Abstract: The present invention relates to a negative electrode active material for a rechargeable lithium battery, a method for preparing the same, and a rechargeable lithium battery including the same. This invention provides a negative electrode active material for a rechargeable lithium battery, comprising a core part including a spherical graphite, and a coating layer containing a low crystalline carbon material and coated on a surface of the core part, wherein a pore volume of less than or equal to 2000 nm is 0.08 ml/g or less, and a tap density is 1.1 g/cm3 or more.
    Type: Application
    Filed: May 13, 2014
    Publication date: December 4, 2014
    Applicant: POSCO CHEMTECH CO., LTD.
    Inventors: Se Mann Kwon, Ji Kwon Jung, Yong Tae Park