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公开(公告)号：US12080873B2
公开(公告)日：2024-09-03
申请号：US17420876
申请日：2020-01-14
发明人： Li Lin Piao , Je Young Kim , Sang Wook Woo , Hee Won Choi
CPC分类号： H01M4/133 , H01M4/366 , H01M4/587 , H01M4/625 , H01M10/0525 , H01M2004/021 , H01M2004/027
摘要： A negative electrode and a secondary battery including the negative electrode. The negative electrode including a current collector and a negative electrode active material layer, wherein the negative electrode active material layer includes negative electrode active material particles, the negative electrode active material particles include natural graphite particles and a carbon coating layer disposed on the natural graphite particles. The negative electrode active material particles have a D50 of 6 μm to 9.2 μm and a half-width of 5.0 μm to 5.5 μm based on a particle size distribution, and the specific surface area of the negative electrode active material particles is from 0.6 m2/g to 2.2 m2/g.
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2.发明公开公开(公告)号：US20230155105A1
公开(公告)日：2023-05-18
申请号：US17768716
申请日：2021-08-20
发明人： Chang Ju Lee , Sang Wook Woo , Suk In Noh
CPC分类号： H01M4/0471 , F26B15/18 , H01M4/0404 , F26B3/347
摘要： An electrode drying method including: constant-rate-drying an electrode substrate coated with an electrode slurry while the electrode substrate is moved in a state that the electrode substrate makes a tilt angle with a horizontal plane; and falling-rate-drying the electrode substrate while the electrode substrate is horizontally moved. The electrode drying method and related system provide suppression of a floating phenomenon of binder elements during a drying process of an electrode and improve adhesive force between an electrode mixture layer and an electrode current collector.
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公开(公告)号：US12087934B2
公开(公告)日：2024-09-10
申请号：US17292248
申请日：2020-01-16
发明人： Hee Won Choi , Je Young Kim , Sang Wook Woo , Li Lin Piao
CPC分类号： H01M4/133 , C01B32/21 , H01M4/366 , H01M4/587 , H01M4/625 , H01M10/0525 , C01P2004/32 , C01P2004/61 , C01P2004/80 , C01P2006/11 , C01P2006/40 , H01M2004/021 , H01M2004/027
摘要： A negative electrode for a secondary battery including: a negative electrode current collector; and a negative electrode active material layer present on the negative electrode current collector. The negative electrode active material layer includes a negative electrode active material, wherein the negative electrode active material for a secondary battery includes natural graphite, and has a sphericity of 0.58 to 1, a tap density of 1.08 g/cc to 1.32 g/cc, and Dmax−Dmin of 16 μm to 19 μm, wherein Dmax−Dmin is a difference between a maximum particle diameter Dmax and a minimum particle diameter Dmin in a particle size distribution.
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公开(公告)号：US12068470B2
公开(公告)日：2024-08-20
申请号：US17292470
申请日：2020-01-23
发明人： Oh Byong Chae , Sang Wook Woo , Ye Ri Kim
CPC分类号： H01M4/0445 , H01M4/043 , H01M4/386 , H01M4/583 , H01M2004/027
摘要： A method of producing a negative electrode for a secondary battery, which includes: forming a negative electrode structure including a negative electrode current collector having two surfaces and a negative electrode active material layer formed on at least one surface of the negative electrode current collector; preparing a pre-lithiation cell including the negative electrode structure, a lithium metal counter electrode disposed to face the negative electrode active material layer of the negative electrode structure, and a separator interposed between the negative electrode structure and the lithium metal counter electrode; immersing the pre-lithiation cell in a pre-lithiation solution; and carrying out pre-lithiation by electrochemically charging the pre-lithiation cell while pressing the pre-lithiation cell at a pressure of 15 kPa to 3,200 kPa.
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公开(公告)号：US11881584B2
公开(公告)日：2024-01-23
申请号：US17293950
申请日：2020-04-02
发明人： Li Lin Piao , Je Young Kim , Sang Wook Woo
CPC分类号： H01M4/587 , C01B32/21 , H01M4/133 , H01M10/0525 , C01P2004/32 , C01P2004/61 , C01P2004/84 , C01P2006/12 , C01P2006/40 , H01M2004/027
摘要： A negative electrode active material including natural graphite, wherein a D90/D10, which is the ratio of D90 to D10, is 2.20 or less, a D50 is 6 μm to 11 μm, and a BET specific surface area is 2.2 m2/g or less.
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公开(公告)号：US20220013759A1
公开(公告)日：2022-01-13
申请号：US17295196
申请日：2020-04-29
发明人： Oh Byong Chae , Sang Wook Woo , Ye Ri Kim
IPC分类号： H01M4/04 , H01M10/0525 , H01M10/0567 , H01M4/1391 , H01M4/131
摘要： A method of preparing a positive electrode for a secondary battery includes preparing a positive electrode in which a positive electrode active material layer including a lithium transition metal oxide is formed on a positive electrode collector, and pre-lithiating the positive electrode by impregnating the positive electrode in an electrolyte solution containing a film-forming additive and performing charge and discharge using a counter electrode.
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公开(公告)号：US12021217B2
公开(公告)日：2024-06-25
申请号：US17292236
申请日：2020-01-30
发明人： Oh Byong Chae , Sang Wook Woo , Ye Ri Kim
CPC分类号： H01M4/0459 , H01M4/0404 , H01M4/386 , H01M4/583 , H01M2004/027
摘要： A method of manufacturing a negative electrode for a secondary battery, which includes: forming a negative electrode structure including a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector; providing a pre-lithiation solution in which a lithium metal counter electrode is immersed and immersing the negative electrode structure in the pre-lithiation solution so that the negative electrode structure is spaced apart from the lithium metal counter electrode; and subjecting the negative electrode structure to a pre-lithiation process, which includes an electrochemical charging process and an electrochemical discharging process performed after the electrochemical charging process, wherein a state of charge (SOCp) of the negative electrode structure subjected to the pre-lithiation process is in a range of 5% to 50%.
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公开(公告)号：US12015143B2
公开(公告)日：2024-06-18
申请号：US17292544
申请日：2020-01-16
发明人： Ye Ri Kim , Sang Wook Woo , Oh Byong Chae
IPC分类号： H01M4/04 , H01M4/02 , H01M4/1393 , H01M4/1395 , H01M4/36 , H01M4/48 , H01M4/587
CPC分类号： H01M4/1393 , H01M4/0404 , H01M4/0459 , H01M4/1395 , H01M4/366 , H01M4/483 , H01M4/587 , H01M2004/021 , H01M2004/027
摘要： A method of manufacturing a negative electrode for a secondary battery. The method includes forming a first negative electrode active material layer including a carbon-based active material on at least one surface of a negative electrode current collector; and forming a second negative electrode active material layer including a silicon-based active material on a surface of the first negative electrode active material opposite the negative electrode current collector, wherein the silicon-based material is intercalated with lithium by pre-lithiation on the first negative electrode active material layer.
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