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A kind of preparation method of microporous diaphragm and microporous diaphragm

A technology of microporous membrane and body membrane, applied in electrical components, circuits, battery pack parts, etc., can solve the problems of poor heat resistance and low mechanical strength of the membrane, and achieve uniform structure, good permeability and obvious effect. Effect

Active Publication Date: 2016-01-06
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of poor heat resistance and low mechanical strength of diaphragms prepared by traditional dry and wet methods, the purpose of the present invention is to provide a method for preparing microporous diaphragms with uniform structure, special microporous structure and high safety performance and Microporous membrane

Method used

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  • A kind of preparation method of microporous diaphragm and microporous diaphragm

Examples

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Effect test

Embodiment 1

[0028] A new type of microporous diaphragm, its main raw material is polypropylene resin, auxiliary materials are plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and flame retardant zinc metaborate, tetrabromobutyl alkane, the thickness of the microporous membrane is 20 μm, and the porosity is 37%. The content of the main resin polypropylene is calculated as 94% by mass percentage, and the content of the plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and the flame retardant zinc metaborate and tetrabromobutane are as follows: The mass percentages are calculated as 2.5%, 1.5%, and 2.0%, respectively.

[0029] The method for preparing described novel microporous diaphragm comprises the steps:

[0030] 1. Stir the main polyolefin resin and auxiliary additives evenly under certain conditions with a high-speed mixing mixer, the stirring speed is 2000rpm, and the stirring time is 20min to obtain the mixture I;

[0031] 2. Add the above mi...

Embodiment 2

[0036] A new type of microporous diaphragm, its main raw material is polypropylene resin, auxiliary materials are plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and heat stabilizer zinc laurate, microporous membrane The thickness is 20 μm and the porosity is 42%. The content of the main resin polypropylene is 94% according to the mass percentage, and the content of the plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and the heat stabilizer zinc laurate are respectively calculated according to the mass percentage. 2.5% and 3.5%.

[0037] The preparation method of this example is basically the same as that of Example 1. The main changes are that in the fourth step of annealing treatment, the annealing temperature is changed to 130° C., and the annealing time is changed to 40 minutes;

Embodiment 3

[0039]A new type of microporous membrane, the main raw material is polypropylene resin, the auxiliary material is antimony trioxide (antimony white) filler and zinc laurate heat stabilizer, the thickness of the microporous membrane is 20 μm, and the porosity is 47%. The content of the main resin polypropylene is 94% by mass percentage, and the content of the filler antimony trioxide (antimony white) and the heat stabilizer zinc laurate are 2.5% and 3.5% by mass percentage, respectively.

[0040] The preparation method of this example is basically the same as that of Example 1. The main changes are that in the fourth step annealing treatment, the transverse stretch ratio is changed to 1.5, and the annealing time is changed to 60 minutes;

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Abstract

The invention relates to the processing field of lithium-ion battery diaphragms, and discloses a preparation method of a microporous diaphragm, a preparation method of a microporous diaphragm, comprising the following steps: 1) mixing the main polyolefin resin and auxiliary additives by stirring 2) Add the obtained mixture Ⅰ to the extruder to melt and plasticize it to form a melt evenly; 3) Extrude the obtained melt from the die to produce an intermediate film; 4) Annealing the intermediate film under bidirectional micro-tension; 5) Longitudinally stretching the annealed intermediate film to prepare a diaphragm with a microporous structure. The invention also discloses the microporous diaphragm prepared by the above method, which is composed of 75-99.9% by weight of the main olefin resin and 25-0.1% by weight of auxiliary additives. The invention has the advantages of being able to prepare lithium-ion battery diaphragms with uniform structure, special microporous structure and high safety performance.

Description

technical field [0001] The invention relates to the field of processing lithium-ion battery diaphragms, in particular to a method for preparing a novel microporous diaphragm with a uniform structure, a special microporous structure and high safety performance, and the microporous diaphragm. Background technique [0002] Lithium battery separator is one of the core components of lithium-ion batteries, and its cost accounts for about 20-30% of the entire lithium battery cost. Its performance has a very important impact on the overall performance of lithium batteries, and is one of the key technologies restricting the development of lithium batteries. [0003] With the continuous expansion of the application field of lithium batteries and the deepening influence of lithium battery products in people's lives, people's requirements for the performance of lithium batteries are also getting higher and higher. In order to meet the development requirements of lithium batteries, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/489H01M50/494
CPCH01M50/403H01M50/411Y02E60/10
Inventor 杨雪梅王今刚王永国杨佳富陈秀峰
Owner SHENZHEN SENIOR TECH MATERIAL
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