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Preparation method for microporous diaphragm and microporous diaphragm

A technology of microporous diaphragm and body film, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of poor heat resistance and low mechanical strength of the diaphragm, achieve uniform structure, good permeability, and provide comprehensive performance Effect

Active Publication Date: 2014-03-12
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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  • Preparation method for microporous diaphragm and microporous diaphragm

Examples

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Effect test

Embodiment 1

[0028] A new type of microporous membrane, the main raw material is polypropylene resin, the auxiliary material is the plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and the flame retardant zinc metaborate and tetrabromobutyl The thickness of the microporous membrane is 20μm 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 percentage is calculated as 2.5% and 1.5%, 2.0% respectively.

[0029] The method for preparing the novel microporous membrane includes the following steps:

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

[0031] 2. Add the above...

Embodiment 2

[0036] A new type of microporous membrane, the main raw material is polypropylene resin, the auxiliary material is plasticizer bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite and heat stabilizer zinc laurate, microporous membrane The thickness is 20μm and the porosity is 42%. The content of the main resin polypropylene is calculated as 94% according to the mass percentage, and the contents 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 embodiment is basically the same as that of embodiment 1, and the main changes are that in the fourth annealing step, 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 materials are the filler antimony trioxide (antimony white) and the heat stabilizer zinc laurate, the thickness of the microporous membrane is 20μm, and the porosity is 47%. The content of the main resin polypropylene is calculated as 94% by mass percentage, and the content of antimony trioxide (antimony white) as filler and zinc laurate as heat stabilizer is 2.5% and 3.5% respectively by mass percentage.

[0040] The preparation method of this embodiment is basically the same as that of embodiment 1, and the main changes are that in the fourth annealing step, 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 field of the processing of lithium-ion battery diaphragms, and discloses a preparation method for a microporous diaphragm. The preparation method for the microporous diaphragm includes the following steps: 1) a principal polyolefin resin and an auxiliary additive are uniformly stirred through a stirring mixer to obtain a mixture I; 2) the obtained mixture I is added into an extruder to be uniformly melted and plasticized into a melt; 3) an intermediate diaphragm is prepared from a cast piece of the melt extruded from a die head; 4) annealing treatment is performed on the intermediate diaphragm under bi-directional micro-tension; 5) the annealed intermediate diaphragm is stretched longitudinally to prepare the diaphragm with a microporous structure. The invention further discloses the microporous diaphragm prepared through the method, which consists of the principal polyolefin resin with a weight percentage of 75 to 99.9 percent and the auxiliary additive with a weight percentage of 25 to 0.1 percent. The preparation method disclosed by the invention has the advantage that the lithium-ion battery diaphragm with a uniform structure, the specific microporous structure and high safety performance can be prepared.

Description

Technical field [0001] The invention relates to the processing field of lithium ion battery diaphragms, and in particular to a method for preparing a novel microporous diaphragm with uniform structure, special microporous structure and high safety performance, and a 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 of the influence of lithium battery products in people's lives, people have higher and higher requirements for the performance of lithium batteries. In order to meet the development requirements of lithium batteries, as an important compo...

Claims

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Application Information

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Patent Type & Authority Applications(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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