公开(公告)号：US12244004B2

公开(公告)日：2025-03-04

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 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/02

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.

公开(公告)号：US20250105241A1

公开(公告)日：2025-03-27

申请号：US18971766

申请日：2024-12-06

Applicant: BYD COMPANY LIMITED

Inventor： Huajun Sun ,  Xiaotao Yuan ,  Kefeng He ,  Zhan Xu ,  Liping Ge

IPC: H01M4/04 ,  H01M4/02 ,  H01M4/70 ,  H01M10/0525

Abstract: A secondary battery electrode plate and a preparation method therefor, and a secondary battery are provided. The secondary battery electrode plate includes a current collector and a first active material layer. The first active material layer is located on a surface of the current collector and contains first active substance particles The first active substance particles have an equivalent sphericity X1 as represented by formula X1=3/(S1R1ρ1), where 0.05≤X1≤0.8; R1 is a median radius of the first active substance particles in a unit of μm; S1 is a specific surface area of the first active substance particles in a unit of m2/g; and ρ1 is true density of the first active substance particles in a unit of g/cm3.