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    POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    1.
    发明公开
    POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME 审中-公开

    公开(公告)号：EP3836259A1

    公开(公告)日：2021-06-16

    申请号：EP19865998.9

    申请日：2019-09-30

    申请人： LG Chem, Ltd.

    发明人： KIM, Won Tae ,  YU, Jong Yeol ,  HA, Seoung Chul ,  SHIN, Sun Sik

    IPC分类号： H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  H01M4/62 ,  H01M10/052 ,  C01G53/00 ,  C01F5/28 ,  C01B35/00

    摘要： The present invention provides a method for preparing a positive electrode active material for a secondary battery, the method including preparing a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein the content of the nickel (Ni) in the total content of the transition metal is 60 mol% or greater, and subjecting the lithium composite transition metal oxide, MgF 2 as a fluorine (F) coating source, and a boron (B) coating source to dry mixing and heat treatment to form a coating portion on the particle surface of the lithium composite transition metal oxide. In addition, the positive electrode active material prepared as described above includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), and a coating portion formed on the particle surface of the lithium composite transition metal oxide, wherein the lithium composite transition metal oxide has the nickel (Ni) in the content of 60 mol% or greater in the total content of the transition metal, and the coating portion includes fluorine (F) and boron (B).

    POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND METHOD FOR PREPARING POSITIVE ELECTRODE ACTIVE MATERIAL
    2.
    发明公开
    POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY AND METHOD FOR PREPARING POSITIVE ELECTRODE ACTIVE MATERIAL 审中-公开

    公开(公告)号：EP3909916A1

    公开(公告)日：2021-11-17

    申请号：EP20871547.4

    申请日：2020-09-29

    申请人： LG Chem, Ltd.

    发明人： SHIN, Ho Suk ,  KIM, Won Tae ,  YU, Jong Yeol ,  LIM, Young Geun ,  SHIN, Sun Sik ,  HA, Seoung Chul

    IPC分类号： C01G53/00 ,  H01M4/525 ,  H01M4/505 ,  H01M10/052

    摘要： The present invention relates to a method for preparing a positive electrode active material, including: a first step of adding to a reactor, a reaction solution including a transition metal-containing solution containing at least one among nickel, cobalt, and manganese, an ammonium ion-containing solution, and a basic aqueous solution to form seeds of precursor particles; a second step of preparing carbon-introduced precursor particles by adding a carbon source to the reactor when the precursor particles grow until an average particle diameter (D 50 ) of the precursor particles is 30% in size of the average particle diameter (D 50 ) of the finally prepared precursor particles; and a third step of mixing the carbon-introduced precursor particles and a lithium raw material and sintering the mixture at a temperature of 750 °C to 950 °C to prepare positive electrode active material particles, wherein the carbon introduced to the precursor particles is volatilized by the sintering of the third step to form cavities in the positive electrode active material particles, and a cavity ratio of the positive electrode active material is 5% to 20%.