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Base membrane suitable for coating, preparation method, lithium battery diaphragm and lithium ion battery

A technology of base film and casting sheet, which is applied in the field of lithium battery diaphragm and lithium ion battery, can solve the problems of low coating adhesion, peeling off, and low adhesion, so as to improve adhesion and enhance overall adhesion , the effect of not easy to fall off

Active Publication Date: 2020-04-10
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the coating film has strong functional characteristics, in the structure of the coating film, the degree of adhesion between the coating and the base film is very low, and uneven coating, The phenomenon of low coating adhesion and peeling off in some areas
This situation will greatly reduce the performance of lithium-ion batteries, and even cause safety accidents in lithium-ion batteries.

Method used

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  • Base membrane suitable for coating, preparation method, lithium battery diaphragm and lithium ion battery
  • Base membrane suitable for coating, preparation method, lithium battery diaphragm and lithium ion battery
  • Base membrane suitable for coating, preparation method, lithium battery diaphragm and lithium ion battery

Examples

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Effect test

Embodiment 1

[0021] See figure 1 , this embodiment 1 provides a method for preparing a base film, comprising: mixing and melting raw materials to form a molten mixture; extruding the molten mixture to form a casting sheet; longitudinal stretching of the casting sheet; Transverse stretching; extraction; two-way synchronous secondary stretching; heat setting; and winding to obtain the base film.

[0022] Optionally, the raw material includes: white oil and polyethylene, and the mass ratio of the two is (3-8):2. Preferably, the mass ratio of white oil and polyethylene is 4:2.

[0023] Optionally, the sequence of longitudinal stretching of the cast sheet and transverse stretch of the cast sheet may be interchanged.

[0024] Optionally, the extraction solvent is such as but not limited to dichloromethane.

[0025] The preparation method of the base film in this embodiment 1 is mainly through the improvement of the processing technology in the preparation process, the surface structure and sur...

Embodiment 2

[0036] On the basis of Example 1, this Example 2 also provides a base film, the surface of the base film has a special concave-convex wrinkle structure, that is, the number of raised folds per square micron area on the surface of the base film is between 15- 35.

[0037] Specifically, the base film is prepared by the preparation method as described above to form the special concave-convex wrinkle structure on the surface of the base film, so as to improve the adhesion of the base film and the coating on the surface of the base film, and enhance the coating. The overall adhesion of the film makes the coating on the surface of the film not easy to fall off. The residual rate of the coating quality of the base film is above 25% after ultrasonic vibration for 1 hour.

[0038] Regarding the component content and specific implementation process of the base film, please refer to the relevant discussion in Example 1, which will not be repeated here.

Embodiment 3

[0040] On the basis of Example 2, this Example 3 also provides a lithium battery separator, including: the above-mentioned base film and a coating coated on the base film.

[0041] Wherein, the coating is, for example but not limited to, a coating slurry containing inorganic ceramic nanoparticles such as alumina, boehmite, and titanium dioxide, and polymers such as organic polyvinylidene fluoride.

[0042] Regarding the component content and specific implementation process of the base film, please refer to the relevant discussion in Examples 1-2, and will not repeat them here.

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Abstract

The invention belongs to the technical field of lithium battery diaphragms, and particularly relates to a base membrane suitable for coating, a preparation method, a lithium battery diaphragm and a lithium ion battery. The preparation method of the base film comprises the following steps: mixing and melting raw materials to form a molten mixture; extruding the molten mixture to form a casting sheet; longitudinally stretching the casting sheet; transversely stretching the casting sheet; performing extraction; performing bidirectional synchronous secondary stretching; heat setting; and rolling to obtain the lithium battery base film. The surface structure and the surface roughness of the base film can be controlled, so that the base film has a special surface structure, the adhesive force ofthe coating on the surface of the base film is improved, the overall cohesiveness of the coating film is enhanced, and the coating coated on the surface of the base film is not easy to fall off.

Description

technical field [0001] The invention belongs to the technical field of lithium battery diaphragms, and in particular relates to a base film suitable for coating and a preparation method, a lithium battery diaphragm, and a lithium ion battery. Background technique [0002] There are generally two types of diaphragms used in lithium-ion batteries. One is to use the base film directly in lithium-ion batteries as a diaphragm; the other is to coat the surface of the base film with a special coating. This kind of coating film can be divided into single-side coating film and double-side coating film, that is, a separator coated on one side or both sides of the base film. [0003] At present, coating films are more and more widely used in lithium-ion batteries, and separators with different functional characteristics can be prepared through the formulation and function of the slurry to meet the different requirements of lithium-ion batteries for various performance indicators. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/0525H01M50/403H01M50/463
CPCH01M10/0525H01M50/403H01M50/463H01M50/449Y02E60/10
Inventor 贾培梁贡晶晶刘涛涛孙爱斌王正丽
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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