公开(公告)号：US20230163280A1

公开(公告)日：2023-05-25

申请号：US18154660

申请日：2023-01-13

Applicant: BYD COMPANY LIMITED

Inventor： Na CHEN ,  Zewen RUAN ,  Yecheng TIAN ,  Xuanwei DENG ,  Nan ZHANG

IPC: H01M4/36 ,  H01M4/525 ,  H01M4/505 ,  C01G53/00

CPC classification number: H01M4/366 ,  H01M4/525 ,  H01M4/505 ,  C01G53/50 ,  H01M2004/028

Abstract: The present disclosure provides a cathode material including multiple composite secondary particles, each of the composite secondary particles including multiple primary cathode material particles, where the composite secondary particles meet: 0.9≤0.1D/A+B*C≤20 (Relation 1). In which A represents a particle size D50 of the primary cathode material particles, unit: μm; B represents a particle size D50 of the composite secondary particles, unit: μm; C represents a specific surface area of the composite secondary particles, unit: m2/g; and D represents a number of the primary cathode material particles in each of composite secondary particles.

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.

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.