公开(公告)号：US20250062328A1

公开(公告)日：2025-02-20

申请号：US18938777

申请日：2024-11-06

Applicant: BYD COMPANY LIMITED

Inventor： Zizhu Guo ,  Xiaoyan Han ,  Yongjun Ma ,  Yi Pan ,  Huajun Sun

IPC: H01M4/38 ,  H01M4/02 ,  H01M4/583 ,  H01M4/62 ,  H01M10/0525

Abstract: A negative electrode sheet, a secondary battery, and an electrical device are provided. The negative electrode sheet includes a negative current collector and a negative electrode active material layer. The negative electrode active material layer is disposed on a surface of the negative current collector. The negative electrode active material layer includes a negative electrode active material and an additive having compression and rebound properties. After a pressure X is applied in a thickness direction of the negative electrode sheet, a rebound rate of the negative electrode sheet is 2%-40%, and a compression rate of the negative electrode sheet is 2%-40%. The pressure X satisfies the following: 0.3 Mpa≤X≤5 Mpa.

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.