Patent ID: 11901546
Assignee: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 16:
17. A process for preparing a secondary battery (5), comprising preparing a negative electrode plate (10) of the secondary battery by the following steps:
1) forming a first negative electrode film (103) comprising a first negative electrode active material on at least one surface of a negative electrode current collector (10); and
2) forming a second negative electrode film (102) comprising a second negative electrode active material on the first negative electrode film (103),
wherein the first and second negative electrode active material both comprise artificial graphite; the first negative electrode active material comprises primary particles, a number percentage of the primary particles in the first negative electrode active material A satisfies A≥50%, and the second negative electrode active material comprises secondary particles, and a number percentage of the secondary particles in the second negative electrode active material B satisfies: B≥30%; and
a volume distribution particle size DV50 of the first negative electrode active material is greater than a volume distribution particle size DV50 of the second negative electrode active material.