公开(公告)号：EP4478452A1

公开(公告)日：2024-12-18

申请号：EP23755707.9

申请日：2023-02-07

Applicant: BYD Company Limited

Inventor： LIU, Jiamin ,  CHEN, Sanzhi ,  DU, Mengyi ,  HAO, Rong

IPC: H01M4/136

Abstract: A positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer arranged on at least a surface of the positive electrode current collector. The positive electrode active material layer includes a positive electrode active material, which includes a first lithium iron phosphate material and a second lithium iron phosphate material. When the cumulative volume distribution percentage of the first lithium iron phosphate material is 50%, the particle size is D 1 v 50 µm. When the cumulative volume distribution percentage of the second lithium iron phosphate material is 50%, the particle size is D 2 v 50 µm. where 0.3 ≤ D 1 v 50≤0.95, 1.0≤D 2 v 50≤3.5. When the volume density of the positive electrode active material reaches a maximum value, the particle size is D mo µm, the compaction density of the positive electrode sheet is PD g/cm 3 , and 0.45 ≤ PD x D mo ≤ 12.38.

公开(公告)号：EP4481854A1

公开(公告)日：2024-12-25

申请号：EP23755708.7

申请日：2023-02-07

Applicant: BYD Company Limited

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

IPC: H01M4/58 ,  H01M10/0525

Abstract: A lithium iron phosphate positive electrode active materialand a preparation method thereof are provided. The method includes the following steps: mixing a first lithium iron phosphate material having a particle size D v 50 of 0.3-0.70 µm and a second lithium iron phosphate material having a particle size D v 50 of 0.75-1.5 µm at a certain ratio, such that the particle size of the lithium iron phosphate positive electrode active material meet: 0.95≤0.1 × (D v 90-D v 10)/D v 5+D v 50 × D n 50≤3.3.