Patents Assigned to POSCO CHEMICAL CO., LTD
  • Publication number: 20210159483
    Abstract: The present disclosure relates to a positive electrode active material for rechargeable lithium ion batteries and a method of preparing the positive electrode active material, in which a compound including sulfur is used as an additive in a wet treatment process to remove residual lithium impurities (LiOH, Li2CO3) present on a surface of the positive electrode active material, such that the residual lithium impurities are effectively removed without loss of capacity while a Li-S compound coating layer is formed on the surface thereof, thereby reducing resistance and leakage current.
    Type: Application
    Filed: November 24, 2020
    Publication date: May 27, 2021
    Applicant: POSCO CHEMICAL CO., LTD.
    Inventors: Sun Tai KIM, Hye Won PARK, Eun Hui PARK
  • Patent number: 11011749
    Abstract: The present invention relates to a lithium-titanium complex oxide used in an electrode active material. A preparation method of a lithium-titanium complex oxide according to the present invention comprises the steps of: preparing a slurry mixture in which a titanium oxide, lithium and zirconium are mixed; wet-milling the mixture using beads having a size of 0.30 mm or less to obtain a wet-milled mixture; spray drying the wet-milled mixture to obtain a spray dried mixture; and calcining the spray dried mixture.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: May 18, 2021
    Assignee: POSCO CHEMICAL CO., LTD
    Inventors: Su Bong Choi, Chun Gu Kang, Jeong Eun Choi, Seung Chang Jeong, Jae An Lee, Jeong Han Kim
  • Publication number: 20210020930
    Abstract: A lithium titanium composite oxide including aluminum-coated primary particles and a method for manufacturing the same are disclosed. A lithium titanium composite oxide including aluminum-coated primary particles according to an embodiment is manufactured by coating lithium titanium oxide primary particles with aluminum by mixing an aluminum compound with re-pulverized particles and then by spray-drying the mixture again to prepare secondary particles. A battery including the lithium titanium composite oxide including the aluminum-coated primary particles exhibits effects of suppressing electrolyte decomposition and gas generation that may be respectively caused by titanium ions and residual lithium in conventional lithium titanium composite oxides.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 21, 2021
    Applicant: POSCO CHEMICAL CO., LTD
    Inventors: Su Bong CHOI, Chun Gu KANG, Jeong Han KIM, Jae An LEE