Preparation method of multi-layer lithium battery diaphragm with high security

A lithium battery diaphragm and functional layer technology, which is applied in the field of microporous membranes, can solve the problems of cumbersome process flow, large environmental pollution, and numerous procedures, and achieve the effects of uniform pore size distribution, low equipment investment cost, and perfect equipment process technology

Active Publication Date: 2015-11-11
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN101779311A discloses a method for preparing a multi-layer microporous membrane, in which a high heat-resistant material is coated on a polyolefin microporous membrane to achieve the purpose of improving the safety of the microporous membrane. However, the process of this method The process is cumbersome, the process is numerous, the cost is high, the efficiency is low, and the waste in the process pollutes the environment greatly

Method used

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  • Preparation method of multi-layer lithium battery diaphragm with high security
  • Preparation method of multi-layer lithium battery diaphragm with high security
  • Preparation method of multi-layer lithium battery diaphragm with high security

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Calcium carbonate (CaCO 3 ) powder is added to polypropylene at a mass ratio of 30%, and then extruded with polypropylene resin through a three-layer co-extrusion casting die to form a precursor film with a three-layer structure of A-B-A, and the A layer is CaCO 3 Mixed layer with polypropylene, layer B is polypropylene layer, three-layer extrusion thickness ratio is 20:60:20. The precursor film is cooled and formed by casting rolls to complete the casting process. The precursor film was heat-treated at 140° C. for 4 hours to obtain heat treatment. The heat-treated film is laminated in two layers by special lamination equipment, and the lamination temperature is 50°C.

[0027] The heat-treated film after 2-layer composite is stretched in the mode of 6 unwinding and 12 layers of stretching, the stretching temperature is 140°C, and the stretching ratio is 2 times to obtain the finished product.

Embodiment 2

[0029] Aluminum hydroxide (Al(OH) 3 ) powder is added to polypropylene at a mass ratio of 50%, and then extruded with polypropylene resin through a three-layer co-extrusion casting die to form a precursor film with a three-layer structure of A-B-A, and the A layer is Al(OH) 3 Mixed layer with polypropylene, layer B is polypropylene layer, and the extrusion thickness ratio of the three layers is 15:70:15. The precursor film is cooled and formed by casting rolls to complete the casting process. The precursor film was heat-treated at 130° C. for 8 hours to obtain a heat-treated film. The heat-treated film is laminated in three layers by special lamination equipment, and the lamination temperature is 30°C.

[0030] The heat-treated film roll after 3-layer lamination is stretched in the mode of 4 unwinding and 12 layers of stretching, the stretching temperature is 120°C, and the stretching ratio is 1.5 times to obtain the finished product.

Embodiment 3

[0032] Calcium carbonate (CaCO 3 ) powder is added to polyester at a mass ratio of 30%, and then extruded with polypropylene resin through a three-layer co-extrusion casting die to form a precursor film with a three-layer structure of A-B-A, and the A layer is CaCO 3 The mixed layer with polyester, the B layer is a polypropylene layer, and the three-layer extrusion thickness ratio is 10:80:10. The precursor film is cooled and shaped by casting rolls to complete the casting process. The precursor film was heat-treated at 120° C. for 12 hours to obtain a heat-treated film. The heat-treated film is laminated in 4 layers by special composite equipment, and the composite temperature is 60°C.

[0033] The heat-treated film roll after 4-layer lamination is stretched in the mode of 4 unwinding and 16 layers of stretching, the stretching temperature is 100°C, and the stretching ratio is 2.5 times to obtain the finished product.

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Abstract

The invention provides a preparation method of a multi-layer lithium battery diaphragm with high security. A microporous diaphragm is prepared by multi-layer coextrusion and unilateral stretching methods. The equipment and process technology of the method are perfect. A functional layer added with an inorganic filler or other pore-forming fillers and a polyolefin microporous membrane are subjected to composite strip casting in a multi-layer coextrusion manner; a multi-layer composite microporous membrane precursor is molded once; and then the composite membrane precursor is subjected to thermal treatment, multi-layer recombination and uniaxial stretching to obtain a high-performance microporous membrane. The microporous membrane obtained by the preparation method is uniform in pore size distribution, high in production efficiency, free of pollution, low in cost and beneficial to large-scale production; and in addition, according to the method, the pore size and distribution are easy to adjust.

Description

technical field [0001] The invention relates to the field of microporous membranes, in particular to a method for preparing a polyolefin microporous membrane and the application of the polyolefin microporous membrane prepared by the method. Background technique [0002] In recent years, polyolefin microporous membranes have been widely used in fields such as battery separators, filtration separation membranes, and medical membranes. In the application process, low cost and high efficiency, and the preparation of products with uniform pore distribution and pore size are a major technical difficulty. Especially in the application of the battery diaphragm, the uniform distribution of pores and the uniform size of the pores are a major guarantee for the superior performance of the battery. At the same time, with people's demand for clean energy and the improvement of environmental protection awareness, the electric vehicle industry has also ushered in a period of rapid developm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/406H01M50/417H01M50/431H01M50/457H01M50/491H01M50/494
CPCH01M10/052H01M50/403H01M50/446H01M50/494H01M50/491H01M50/406H01M50/457Y02E60/10
Inventor 朱俊植志飞
Owner SHENZHEN SENIOR TECH MATERIAL
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