Patents by Inventor Kwon Sun Roh

Kwon Sun Roh 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).

  • Electrolyte composition, lithium battery using the same, and method of manufacturing the lithium battery
    Patent number: 7220519
    Abstract: An electrolyte composition, a lithium battery using the electrolyte composition, and a method of manufacturing the lithium battery are provided. The electrolyte composition contains: a lithium salt; an organic solvent containing 15-50% by weight of propylene carbonate based on the total weight of the electrolyte composition; a nitrogen-containing compound; and cyclohexylbenzene. The lithium battery manufactured using the electrolyte composition has improved stability even when overcharged and improved cycle characteristics.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: May 22, 2007
    Assignee: SKC Co., Ltd.
    Inventors: Kwon Sun Roh, Jong Hyuk Choi, Chi Kyun Park, Jon Ha Lee
  • Electrolyte composition, lithium battery using the same, and method of manufacturing the lithium battery
    Publication number: 20050042520
    Abstract: An electrolyte composition, a lithium battery using the electrolyte composition, and a method of manufacturing the lithium battery are provided. The electrolyte composition contains: a lithium salt; an organic solvent containing 15-50% by weight of propylene carbonate based on the total weight of the electrolyte composition; a nitrogen-containing compound; and cyclohexylbenzene. The lithium battery manufactured using the electrolyte composition has improved stability even when overcharged and improved cycle characteristics.
    Type: Application
    Filed: August 18, 2004
    Publication date: February 24, 2005
    Applicant: SKC CO., LTD.
    Inventors: Kwon Sun Roh, Jong Hyuk Choi, Chi Kyun Park, Jon Ha Lee
  • Method for preparing lithium ion polymer battery
    Patent number: 6794088
    Abstract: The lithium ion polymer battery having high capacity, capacity retention and cycling life is prepared by gelating a gel polymer electrolyte composition comprising an organic solvent, a lithium salt, and a gelling agent composed of a nitrogen-containing polymer and an epoxy group-containing polymer at room temperature according to the present invention free from heating step at a low cost.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: September 21, 2004
    Assignee: SKC Limited
    Inventors: Kwon-Sun Roh, Jae-Myoung Lee, Jon-Ha Lee
  • Composition for forming electrode active material of lithium secondary battery, composition for forming separator and method of preparing lithium secondary battery using the compositions
    Patent number: 6692873
    Abstract: An electrode active material forming composition, a separator forming composition and a manufacturing method of a lithium secondary battery using the compositions are provided.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: February 17, 2004
    Assignee: SKC Co., Ltd.
    Inventors: Chi-kyun Park, Archana Kakirde, Peikang Liu, Venkatesan Manivannan, Chul Chai, Dong-joon Ihm, Jon-ha Lee, Kwon-sun Roh
  • Method for preparing lithium ion polymer battery
    Publication number: 20030175594
    Abstract: The lithium ion polymer battery having high capacity, capacity retention and cycling life is prepared by gelating a gel polymer electrolyte composition comprising an organic solvent, a lithium salt, and a gelling agent composed of a nitrogen-containing polymer and an epoxy group-containing polymer at room temperature according to the present invention free from heating step at a low cost.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 18, 2003
    Inventors: Kwon-Sun Roh, Jae-Myoung Lee, Jon-Ha Lee
  • Lithium battery and method for the preparation thereof
    Publication number: 20030003367
    Abstract: The present invention provides a lithium battery having improved performance properties and no risk of electrolyte leakage which comprises both a liquid electrolyte and a gel-type electrolyte.
    Type: Application
    Filed: May 9, 2002
    Publication date: January 2, 2003
    Inventors: Kwon-Sun Roh, Dong-Joon Ihm, Jon-Ha Lee
  • Liquid electrolyte composition and lithium battery comprising same
    Publication number: 20020187404
    Abstract: A liquid electrolyte composition comprising a sulfide of a IV-group element, an organic solvent and a lithium salt is advantageously used for the preparation of a lithium battery having improved mean voltage, cycling life and capacity properties.
    Type: Application
    Filed: April 5, 2002
    Publication date: December 12, 2002
    Inventors: Kwon-Sun Roh, Dong-Joon Ihm, Jon-Ha Lee
  • Polymer electrolyte precursor having improved impedence
    Publication number: 20020172859
    Abstract: A polymer electrolyte precursor comprising a VdF-HFP copolymer, a lithium and a plasticizer is used for the preparation of a bellcore-type polymer battery having improved impedence, low-temperature characteristics, cycle life and self-discharge properties.
    Type: Application
    Filed: May 9, 2002
    Publication date: November 21, 2002
    Inventors: Kwon-Sun Roh, Jong-Hyuk Choi, Dong-Joon Ihm, Jon-Ha Lee