公开(公告)号：US12272817B2

公开(公告)日：2025-04-08

申请号：US17785871

申请日：2020-11-11

Applicant: BYD COMPANY LIMITED

Inventor： Riguo Mei ,  Xiaoya Chang ,  Ziwen Wu ,  Yi Pan

IPC: H01M10/0525 ,  H01M4/04 ,  H01M4/38 ,  H01M4/62 ,  H01M4/02

Abstract: The present disclosure relates to a lithium-replenishing material, a preparation method thereof, and a lithium-ion battery. The lithium-replenishing material comprises metal lithium particles and conductive material, and the conductive material includes a built-in segment embedded in metal lithium particles and an exposed segment external to metal lithium particles; the electrical conductivity of the conductive material is greater than 100 s/cm. The lithium-replenishing material of the present disclosure can accomplish the electron conduction between the metal lithium particles and the anode active material through the conductive material, which increases the channel of electron conduction, and at the same time facilitates the transport of lithium ions, and improves the efficiency of lithium-replenishing significantly by rapid intercalation process of lithium ions, thereby resulting in inhibiting the formation of isolated lithium effectively and avoiding the formation of dendrites piercing the battery separator and causing potential safety hazards.

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.