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1.发明公开公开(公告)号：US20240145674A1
公开(公告)日：2024-05-02
申请号：US18280564
申请日：2022-03-22
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Hwan Young Choi , Hyun Ah Park , Hyeon Hui Baek , Jong Pil Kim
IPC: H01M4/36 , H01M4/02 , H01M4/505 , H01M4/525 , H01M10/052
CPC classification number: H01M4/362 , H01M4/505 , H01M4/525 , H01M10/052 , H01M2004/028
Abstract: Provided is a positive electrode active material including a plurality of crystallites A, wherein the plurality of crystallites A has a crystallite long-axis orientation degree DoA represented by Equation 1 below is 0.5 to 1, and a crystallite c-axis orientation degree represented by a cross product value of a c-axis rotation vector Rc of a crystal lattice of a crystallite obtained by electron backscatter diffraction (EBSD) analysis and a position unit vector P′ of the crystallite is 0.5 to 1. A proportion of the plurality of crystallites A is 25% to 80% with respect to a total number of crystallites in a cross-section of a positive electrode active material. Further provided is a positive electrode and a lithium secondary battery including the positive electrode active material.
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公开(公告)号：US11909029B2
公开(公告)日：2024-02-20
申请号：US17055012
申请日：2019-05-21
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Sang Soon Choi , Hyun Ah Park
CPC classification number: H01M4/131 , H01M4/505 , H01M4/525 , H01M4/621 , H01M10/052 , H01M10/42 , H01M4/366
Abstract: A positive electrode for a secondary battery includes a positive electrode active material layer, which includes a positive electrode active material including a lithium transition metal oxide which contains nickel, cobalt, and manganese and has an atomic ratio of nickel in total transition metals of 80 atm % or more, and a metal oxide including a metallic element having a binding potential with lithium of 0.5 V to 4 V. A secondary battery including the positive electrode is also provided.
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公开(公告)号：US11258063B2
公开(公告)日：2022-02-22
申请号：US16628111
申请日：2018-07-13
Applicant: LG Chem, Ltd.
Inventor： Sang Soon Choi , Seung Beom Cho , Hyun Ah Park , Won Sig Jung
IPC: H01M4/525 , C01G53/00 , H01M4/505 , H01M10/0525 , H01M4/02
Abstract: A method of preparing a positive electrode active material which includes forming a pre-sintered mixture by adding a reaction mixture including a lithium raw material and a nickel-manganese-cobalt precursor to a first crucible and performing a primary heat treatment at a temperature of 500° C. to 800° C., and, after discharging the pre-sintered mixture from the first crucible, adding the pre-sintered mixture to a second crucible and performing a secondary heat treatment at a temperature of 700° C. to 1,000° C. to form a lithium nickel manganese cobalt-based positive electrode active material, wherein a volume of the pre-sintered mixture formed after the primary heat treatment is 20% to 50% of a volume of the reaction mixture added to the first crucible.
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4.发明公开公开(公告)号：US20240145672A1
公开(公告)日：2024-05-02
申请号：US18278321
申请日：2022-03-22
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Hwan Young Choi , Jong Pil Kim , Yeo June Yoon , Kang Hyeon Lee , Tae Young Rhee , Yong Jo Jung
IPC: H01M4/36 , H01M4/505 , H01M4/525 , H01M10/052
CPC classification number: H01M4/362 , H01M4/505 , H01M4/525 , H01M10/052 , H01M2004/028
Abstract: Provided is a positive electrode active material which includes an inner region that is a region from the center of the positive electrode active material particle to R/2, and an outer region that is a region from R/2 to the surface of the positive electrode active material particle, wherein R is a distance from the center of the positive electrode active material particle to the surface thereof. The positive electrode active material further includes 25% to 80% of crystallites C with respect to a total number of crystallites in the outer region. The crystallites C have a high crystallite long-axis orientation degree of 0.5 to 1 and a low crystallite c-axis orientation degree less than 0.5. Thus, the positive electrode active material has high capacity characteristics and a small amount of gas generated.
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公开(公告)号：US20230268489A1
公开(公告)日：2023-08-24
申请号：US18005234
申请日：2021-08-23
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Yeo June Yoon , Kang Hyeon Lee , Tae Young Rhee , Yong Jo Jung
CPC classification number: H01M4/366 , H01M4/5825 , H01M4/525 , H01M4/505 , C01G53/50 , H01M2004/028
Abstract: A method of preparing a positive electrode active material which includes a first step of preparing a cake including a lithium transition metal oxide having a lithium borate compound formed on a surface thereof by mixing a positive electrode active material precursor having a specific composition, a lithium-containing raw material, and a boron-containing raw material and sintering the mixture, and a second step of grinding the cake and washing the ground cake to prepare a lithium transition metal oxide having the lithium borate compound removed therefrom. The method reduces the problems of breaking lithium transition metal oxide during the post processing steps by reduction in cake strength and change in the strength over time, thereby providing a positive electrode active material having improved quality.
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Patent Agency Ranking
6.发明公开公开(公告)号：US20230142182A1
公开(公告)日：2023-05-11
申请号：US17768548
申请日：2020-10-23
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Kang Hyeon Lee , Tae Young Rhee , Hwan Young Choi
IPC: H01M4/485 , H01M4/505 , H01M4/525 , H01M10/0525
CPC classification number: H01M4/485 , H01M4/505 , H01M4/525 , H01M10/0525 , H01M2004/028
Abstract: A positive electrode active material, a positive electrode including the positive electrode active material, and a lithium secondary battery including the same are disclosed herein. In some embodiments, the positive electrode active material includes a lithium transition metal oxide containing nickel in an amount of 60 mol% or greater based on a total number of moles of transition metals in the lithium transition metal oxide, and in the form of a secondary particle which is an aggregate of primary particles. The positive active material satisfies Equation (1) : -0.021x + 4.0 ≤ y ≤ -0.021x + 5.5, wherein x is a crystal grain size (nm) of the positive electrode active material, and y is a crystal grain aspect ratio of the positive electrode active material.
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公开(公告)号：US20250046806A1
公开(公告)日：2025-02-06
申请号：US18718123
申请日：2023-05-22
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Jong Pil Kim , Eung Ju Lee , Tae Young Rhee , Hwan Young Choi
Abstract: A positive electrode active material in a form of a single particle is configured so that after a positive electrode, which includes a positive electrode active material layer containing 80 wt % or more of the positive electrode active material based on a total weight of the positive electrode active material layer, is rolled, a density of the positive electrode active material layer after the rolling is 2.7 g/cm3 or more. When the positive electrode active material layer is analyzed by XRD (X-ray diffraction), a ratio of an area of a (003) peak to an area of all peaks identified in a 2θ range of 10° to 90° satisfies 30% or more. Also provided is a positive electrode including the same. The positive electrode active material is capable of achieving a battery with improved initial resistance characteristics and life characteristics.
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公开(公告)号：US20220320617A1
公开(公告)日：2022-10-06
申请号：US17608904
申请日：2020-12-15
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Tae Young Rhee , Hwan Young Choi
Abstract: A method for separating a transition metal from a waste positive electrode material includes step 1 of preparing a waste positive electrode material represented by Formula 1, step 2 of heat treating the waste positive electrode material in an inert gas atmosphere or an oxygen atmosphere to phase separate the waste positive electrode material into a lithium oxide and a metal oxide, step 3 of cooling an obtained product of step 2 to room temperature in an inert atmosphere, and step 4 of mixing a cooled product cooled to room temperature in step 3 with distilled water, and then filtering the mixture to leach a transition metal.
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公开(公告)号：US20220263073A1
公开(公告)日：2022-08-18
申请号：US17608356
申请日：2020-11-19
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Hyun Ah Park , Yeo June Yoon , Kang Hyeon Lee
Abstract: A method for producing a positive electrode active material includes washing a lithium transition metal oxide with a washing solution, and solid-phase mixing the washed lithium transition metal oxide and a metal phosphate compound having a melting point of 500° C. or lower, followed by performing heat treatment to form a coating layer on the surface of the lithium transition metal oxide.
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10.发明申请公开(公告)号：US20190355979A1
公开(公告)日：2019-11-21
申请号：US16476983
申请日：2018-05-24
Applicant: LG Chem, Ltd.
Inventor： Won Sig Jung , Sang Soon Choi , Hyun Ah Park
IPC: H01M4/36 , H01M4/525 , H01M10/052
Abstract: The present invention provides a method of preparing a positive electrode active material precursor for a lithium secondary battery, a method of preparing a positive electrode active material for a lithium secondary battery in which the positive electrode active material precursor prepared by using the above method is used, and a positive electrode for a lithium secondary battery and a lithium secondary battery which include the positive electrode active material.
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