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    COMPOSITE POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION BATTERY, LITHIUM ION BATTERY, AND VEHICLE
    3.
    发明申请
    COMPOSITE POSITIVE ELECTRODE MATERIAL FOR LITHIUM ION BATTERY, LITHIUM ION BATTERY, AND VEHICLE 有权

    公开(公告)号：US20220255066A1

    公开(公告)日：2022-08-11

    申请号：US17614285

    申请日：2020-05-27

    Applicant: BYD COMPANY LIMITED

    Inventor： Yi PAN ,  Rong HAO ,  Na CHEN ,  Xiaotao YUAN

    IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/525 ,  H01M4/505

    Abstract: Disclosed herein are a composite cathode material for a lithium-ion battery, a lithium-ion battery, and a vehicle. A core of the cathode material is a lithium-nickel-cobalt-manganese oxide material. A surface layer of the cathode material is a lithium-nickel-cobalt oxide material doped with an element E. There is a transition layer between the core and the surface layer. The transition layer is a lithium-nickel-cobalt-manganese oxide material doped with the element E. A content of the element E in the transition layer shows a decreasing trend in a direction from the surface layer of the cathode material to the core. A general formula for the composition of the transition layer is Li1+mNi1-x-y-zCoxMnyEzO2. 0≤m≤0.1, 0.01≤x≤0.1, 0.01≤y≤0.1, and 0.01≤z≤0.1. E is at least one of Al, Zr, Ti, Y, Ba or Sr.

    BATTERY AND ELECTRICAL DEVICE
    4.
    发明申请
    BATTERY AND ELECTRICAL DEVICE 有权

    公开(公告)号：US20240429363A1

    公开(公告)日：2024-12-26

    申请号：US18830153

    申请日：2024-09-10

    Applicant: BYD COMPANY LIMITED

    Inventor： Bizhe SU ,  Rong HAO ,  Minghao ZHUANG ,  Liping GE ,  Yecheng TIAN

    IPC: H01M4/13 ,  H01M4/02 ,  H01M4/62 ,  H01M10/052 ,  H01M10/0567 ,  H01M10/0569

    Abstract: A battery includes a positive electrode plate, a negative electrode plate, an electrolyte solution, and a separator between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive current collector and a positive material layer disposed on the positive current collector. The negative electrode plate includes a negative current collector and a negative material layer disposed on the negative current collector. The positive electrode plate and the negative electrode plate are configured to have a strong liquid retention capability for the electrolyte solution that can reduce the occurrence of lithium plating during charging.

    LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE SHEET AND LITHIUM ION BATTERY
    5.
    发明申请
    LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE SHEET AND LITHIUM ION BATTERY 有权

    公开(公告)号：US20240405217A1

    公开(公告)日：2024-12-05

    申请号：US18802786

    申请日：2024-08-13

    Applicant: BYD COMPANY LIMITED

    Inventor： Jiamin LIU ,  Sanzhi CHEN ,  Qingqing GAO ,  Rong HAO

    IPC: H01M4/58 ,  C01B25/45 ,  H01M4/02 ,  H01M4/136 ,  H01M4/36 ,  H01M4/62 ,  H01M10/0525

    Abstract: A lithium iron phosphate positive electrode active material includes: a first lithium iron phosphate material having a particle size of D1v50 μm in a range of 0.3-0.95 at 50% cumulative volume distribution of the first lithium iron phosphate material, and a second lithium iron phosphate material having a particle size of D2v50 μm in a range of 1.0-3.5 at 50% cumulative volume distribution of the second lithium iron phosphate material. Particle sizes of the lithium iron phosphate positive electrode active material are respectively Dv90 μm, Dv10 μm, and Dv50 μm at 90%, 10%, and 50% cumulative volume distribution of the lithium iron phosphate positive electrode active material, a particle size of the lithium iron phosphate positive electrode active material is Dn50 μm at 50% cumulative number distribution of the lithium iron phosphate positive electrode active material, and 0.16 ≤ D v ⁢ 90 - D v ⁢ 10 D v ⁢ 50 + D v ⁢ 50 × D n ⁢ 50 ≤ 31.1 .

    METHOD FOR PREPARING LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE POLE PIECE AND LITHIUM ION BATTERY
    7.
    发明公开
    METHOD FOR PREPARING LITHIUM IRON PHOSPHATE POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE POLE PIECE AND LITHIUM ION BATTERY 审中-公开

    公开(公告)号：US20240128452A1

    公开(公告)日：2024-04-18

    申请号：US18399192

    申请日：2023-12-28

    Applicant: BYD COMPANY LIMITED

    Inventor： Mengyi DU ,  Sanzhi CHEN ,  Rong HAO

    IPC: H01M4/58 ,  C01B25/45 ,  H01M4/131

    CPC classification number: H01M4/5825 ,  C01B25/45 ,  H01M4/131 ,  C01P2004/03 ,  C01P2006/10

    Abstract: A method for preparing a lithium iron phosphate positive electrode material includes: sequentially grinding, spray-drying and sintering a first mixture slurry containing iron phosphate, a lithium source, a carbon source and a solvent to obtain a spherical first lithium iron phosphate material; sequentially grinding, spray-drying, sintering and crushing a second mixture slurry containing iron phosphate, a lithium source, a carbon source and a solvent to obtain a second lithium iron phosphate material with an irregular morphology; and mixing the first and second lithium iron phosphate materials in equal mass ratio to obtain a lithium iron phosphate positive electrode material, the fitted value of the maximum compaction density of which is C, where C=0.0847t1+0.0196T1−0.0095t2+0.0261T2−33.6716. T1 and t1 represent the sintering temperature and sintering time of the first lithium iron phosphate material respectively, T2 and t2 represent the sintering temperature and sintering time of the second lithium iron phosphate material respectively.

    COMPOSITE POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE SHEET, MANUFACTURING METHOD THEREFOR, AND BATTERY
    9.
    发明公开
    COMPOSITE POSITIVE ELECTRODE MATERIAL, POSITIVE ELECTRODE SHEET, MANUFACTURING METHOD THEREFOR, AND BATTERY 审中-公开

    公开(公告)号：US20230299281A1

    公开(公告)日：2023-09-21

    申请号：US18021225

    申请日：2021-08-04

    Applicant: BYD COMPANY LIMITED

    Inventor： Na CHEN ,  Zewen RUAN ,  Yan ZHU ,  Rong HAO ,  Yi PAN

    IPC: H01M4/525 ,  H01M4/04 ,  H01M10/0525

    CPC classification number: H01M4/525 ,  H01M4/0404 ,  H01M4/0471 ,  H01M4/043 ,  H01M10/0525 ,  H01M2004/028

    Abstract: The present invention discloses a composite positive electrode material, a positive electrode plate and a preparation method thereof, and a battery. The composite positive electrode material comprises a ternary material (11) and a phase-transition material (12). The phase-transition material (12) undergoes phase transition in the charge/discharge voltage window of the ternary material (11). The ternary material (11) has a single crystal structure, the phase-transition material (12) has a single crystal structure or a poly-crystalline structure, and the phase-transition material (12) is coated on the surface of the ternary material (11). The weight ratio of the ternary material (11) to the phase-transition material (12) is 80:20-99.8:0.2. The ternary material (11) has a nanohardness of 0.001-5 GPa, and the phase-transition material (12) has a nanohardness of 0.01-10 GPa. According to the embodiment of the present invention, the cycle performance of the battery is improved, the impedance increase of the material during the aging process is reduced, and the safety of the battery is improved.

    POSITIVE ELECTRODE PLATE AND BATTERY
    10.
    发明公开
    POSITIVE ELECTRODE PLATE AND BATTERY 审中-公开

    公开(公告)号：US20230253549A1

    公开(公告)日：2023-08-10

    申请号：US18012599

    申请日：2021-05-13

    Applicant: BYD COMPANY LIMITED

    Inventor： Zewen RUAN ,  Na CHEN ,  Rong HAO ,  Yi PAN

    IPC: H01M4/36 ,  H01M4/505 ,  H01M4/131 ,  H01M4/525

    CPC classification number: H01M4/366 ,  H01M4/505 ,  H01M4/131 ,  H01M4/525 ,  H01M2004/028

    Abstract: Provided is a positive electrode plate, including a current collector and a positive electrode active layer arranged on the current collector. The positive electrode active layer includes m positive electrode active sub-layers. A positive electrode active material in each positive electrode active sub-layer includes a main positive electrode material and an auxiliary positive electrode material. The D50 particle size of the main positive electrode material in the positive electrode active layer satisfies 1/(√{square root over (2)}−1)n−1D501≤D50n≤n(√{square root over (2)}+1)n−1D501. The D90 particle size of the auxiliary positive electrode material is less than the D10 particle size of the main positive electrode material in a first positive electrode active sub-layer.

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