公开(公告)号：US20250006929A1

公开(公告)日：2025-01-02

申请号：US18884254

申请日：2024-09-13

Applicant: Ningde Amperex Technology Limited

Inventor： Yawen HUANG ,  Wei TAO ,  Ao LIU ,  Lei LI

IPC: H01M4/587 ,  H01M4/02 ,  H01M4/133 ,  H01M4/62 ,  H01M10/0525

Abstract: An electrochemical apparatus includes a negative electrode plate, where the negative electrode plate includes a negative electrode current collector, a first layer, and a second layer. The first layer is disposed between the negative electrode current collector and the second layer. The first layer and the second layer both include graphite, and a ratio of crystallinity of graphite in the second layer to crystallinity of graphite in the first layer is 0.4 to 0.8. Using graphite with higher crystallinity in the first layer can achieve a higher capacity, increasing the energy density of the electrochemical apparatus; and using graphite with lower crystallinity in the second layer can avoid the problem of lithium precipitation on the surface of the high crystallinity graphite of the first layer, improving the kinetic performance of the electrochemical apparatus.

公开(公告)号：US20240372095A1

公开(公告)日：2024-11-07

申请号：US18654174

申请日：2024-05-03

Applicant: Ningde Amperex Technology Limited

Inventor： Wei TAO ,  Yusheng CHEN

IPC: H01M4/583 ,  H01M4/02

Abstract: An electrochemical apparatus includes a negative electrode plate. The negative electrode plate includes a negative electrode current collector, a first layer, and a second layer. The first layer is located between the negative electrode current collector and the second layer. Both the first layer and the second layer include graphite; a thermal decomposition temperature of the graphite in the first layer is A, and A is greater than or equal to 800° C.; and a thermal decomposition temperature of the graphite in the second layer is B, and B ranges from 500° C. to 700° C.; and 100° C.≤A−B≤500° C. The thermal decomposition temperature A of the graphite in the first layer and the thermal decomposition temperature B of the graphite in the second layer are designed to satisfy 100° C.≤A−B≤500° C.