Separator, preparation method therefor and related secondary battery, battery module, battery pack and device
AssigneeContemporary Amperex Technology (Hong Kong) Limited
InventorsCong Cheng, Haiyi Hong, Yuanyuan Lan, Jianrui Yang, Na Liu, Haizu Jin
Life of this patent
Estimating the term…
Abstract
The present application relates to a separator in the electrochemical field and a preparation method therefor, and to a secondary battery comprising the separator, a device comprising the secondary battery. The separator of the present application is prepared by a simple process and has excellent heat resistance performance. Moreover, the secondary batteries and devices comprising the separator of the present application have good safety performance and cycling performance.
Claims20
A secondary battery, comprising a separator, the separator comprising:
- a substrate;
- and
- a coating provided on at least one surface of the substrate;
- wherein the coating comprises inorganic particles and organic particles, the inorganic particles form an inorganic particle layer, the organic particles comprise first organic particles and second organic particles, the first organic particles and the second organic particles are embedded in the inorganic particle layer and form protrusions on a surface of the inorganic particle layer;
- wherein the first organic particles have a number-average particle size greater than a number-average particle size of the second organic particles, the second organic particles have a number-average particle size of 2 μm to 8 μm,
- wherein an area coverage of the first organic particles on a surface of the coating is greater than an area coverage of the second organic particles on the surface of the coating.
Dependencies are inferred from the claim text.