公开(公告)号：EP4481856A1

公开(公告)日：2024-12-25

申请号：EP23765789.5

申请日：2023-02-22

Applicant: BYD Company Limited

Inventor： WEN, Xin ,  GAO, Qingqing ,  CHEN, Sanzhi ,  HAO, Rong

IPC: H01M4/58 ,  H01M10/0525

Abstract: A lithium iron phosphate positive electrode active material, a preparation method thereof, and a lithium-ion battery are provided. The positive electrode active material is formed by mixing a first and a second lithium iron phosphate material. When the volume distribution percentages of the first and second lithium iron phosphate material reach a maximum value, the corresponding particle sizes are D 1 mo µm and D 2 mo µm respectively, and 0.3≤D 1 mo ≤3.2, 1≤D 2 mo ≤5, and D 1 mo 2 mo . The discreteness in particle size distribution of the first and second lithium iron phosphate material is A 1 and A 2 respectively, and 1≤A 1 ≤3, 2≤A 2 ≤4, 4.07 1 x (2.31+D 1 mo ) 2 x (D 2 mo -1.15)

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.

公开(公告)号：EP4481855A1

公开(公告)日：2024-12-25

申请号：EP23765788.7

申请日：2023-02-22

Applicant: BYD Company Limited

Inventor： WEN, Xin ,  GAO, Qingqing ,  CHEN, Sanzhi ,  HAO, Rong

IPC: H01M4/58 ,  H01M10/0525

Abstract: A lithium iron phosphate positive electrode active material, a preparation method thereof, and a lithium ion battery are provided. The positive electrode active material is formed by mixing a first and a second lithium iron phosphate material. When the volume distribution percentages of the first and second lithium iron phosphate material reach a maximum value, the corresponding particle sizes are D 1 mo µm and D 2 mo µm respectively; and 0.3≤D 1 mo ≤3.2, 1≤D 2 mo ≤5; and D 1 mo 2 mo . The sphericity of the first and second lithium iron phosphate material are respectively A 1 and A 2 . The first lithium iron phosphate material meets a relation formula below: 0.49 1 mo +0.439A 1 2 mo +2.44A 2 -1.70D 2 mo × A 2