Title:
NEGATIVE ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, AND SECONDARY BATTERY AND ELECTRIC DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/077632
Kind Code:
A1
Abstract:
Provided in the present application are a negative electrode sheet and a preparation method therefor, and a secondary battery and an electric device. The method comprises: providing a negative electrode current collector; coating at least one surface of the negative electrode current collector with a photosensitive adhesive and curing same to form a photosensitive layer; patterning light into a preset pattern, and making the light incident to the photosensitive layer from the surface of the photosensitive layer that is away from the negative electrode current collector, so as to expose the photosensitive layer; developing the exposed photosensitive layer, so as to obtain a photosensitive layer having a recess; filling the recess with a negative electrode slurry, and curing the negative electrode slurry, so as to form a negative electrode film layer; and removing at least part of the photosensitive layer, so as to obtain a negative electrode sheet. By means of the present application, a photosensitive adhesive is exposed and developed, such that the structural form and the distribution form of a recess in the photosensitive adhesive can be accurately adjusted and controlled; and the photosensitive adhesive assists and cooperates with a negative electrode film layer to form a hole, such that a hole structure in the negative electrode film layer can be accurately adjusted and controlled, thereby facilitating an improvement in the quick-charging performance and the safety performance of a secondary battery.
Inventors:
LIN HAIMING (CN)
Application Number:
PCT/CN2022/125519
Publication Date:
April 18, 2024
Filing Date:
October 14, 2022
Export Citation:
Assignee:
CONTEMPORARY AMPEREX TECH CO LIMITED (CN)
International Classes:
H01M4/139
Attorney, Agent or Firm:
BEIJING EAST IP LTD. (CN)
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