Aromatic polyamide slurry and preparation method thereof, and porous diaphragm and preparation method thereof

An aramid, slurry technology, applied in electrical components, circuits, battery pack parts, etc., can solve the problems of uneven pore size, poor mechanical properties, difficult to control pore size uniformity, etc., and achieve low moisture content and pore size. good uniformity

Active Publication Date: 2019-06-28
微宏先进膜公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent announcement number CN104053714B and patent publication number CN103943806A respectively disclose a method for preparing a porous aramid membrane. The membrane is generally prepared by short-fiber pulp papermaking or non-solvent-induced phase inversion method. The former has poor mechanical properties and pore size Inhomogeneity, while the latter problem of pore size uniformity is still difficult to control, and the water absorption rate of the porous diaphragm prepared by the bulk structure of polyamide is relatively high, and the pore size uniformity and moisture content of the diaphragm are important factors affecting the performance of the cell. factor

Method used

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  • Aromatic polyamide slurry and preparation method thereof, and porous diaphragm and preparation method thereof
  • Aromatic polyamide slurry and preparation method thereof, and porous diaphragm and preparation method thereof
  • Aromatic polyamide slurry and preparation method thereof, and porous diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0072] (1) Aramid slurry preparation

[0073] Mix polym-phenylene isophthalamide, N,N-dimethylformamide and lithium chloride at a mass ratio of 18.4:76.8:4.8 to obtain a transparent aromatic polyamide solution; add reactive Add adipoyl chloride, and stir at room temperature for 2 hours to form polym-phenylene isophthalamide: N,N-dimethylformamide: lithium chloride: adipoyl chloride with a mass ratio of 17.8:74.3 : 4.6: 3.3 aramid slurry, the rotational viscosity of the obtained aramid slurry is 488,000cp.

[0074] (2) Preparation of porous diaphragm

[0075] Extrude the aramid slurry onto the tetrafluoro chain belt to form a liquid film with a thickness of about 20um; immerse the tetrafluoro chain belt together with the liquid film into water and N,N-dicarbonate with a mass ratio of 25:75 A coagulation bath composed of methylformamide, the temperature of the coagulation bath is 30°C, stay in the coagulation bath for 2 minutes, and the liquid film forms a film in the coagulat...

Embodiment 2

[0081] Same as Example 1, except that the mass ratio of polym-phenylene isophthalamide, N,N-dimethylformamide, lithium chloride, and adipoyl chloride in the aramid slurry is replaced by 19.8:75.2 :2.9:2.1, the rotational viscosity of the obtained aramid slurry was 546,000cp.

[0082] The obtained separator had a porosity of 52.3%, an air permeability of 94s / 100cc, a moisture content of 3620ppm, an average pore diameter of 47.5nm, and an average pore diameter standard deviation of 0.023.

Embodiment 3

[0084] Same as in Example 1, except that poly-p-phenylene terephthalamide is used instead of poly-m-phenylene isophthalamide, and the rotational viscosity of the obtained aramid slurry is 643,000 cp. The obtained diaphragm had a porosity of 61.4%, an air permeability of 74s / 100cc, a moisture content of 3240ppm, and an average pore diameter of 93.8nm, with a standard deviation of the average pore diameter of 0.021.

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Abstract

The present invention provides aromatic polyamide slurry. The aromatic polyamide slurry comprises the following raw materials: 15-30 wt% of aromatic polyamide compound, 2-15 wt% of a reactive additiveand 59-82 wt% of a solvent, and 0.5-7 wt% of a solubilizing assistant can be added into the aromatic polyamide slurry, and the present invention further provides a porous diaphragm prepared by employing the aromatic polyamide slurry and a preparation method thereof. The porous diaphragm prepared by employing the aromatic polyamide is high in thermal stability, good aperture uniformity and low inmoisture content, can effectively improve the safety performance of cells when being applied to a lithium ion battery, and can inhibit the reduction of the capacities and the cycle performances of thecells.

Description

technical field [0001] The invention relates to the field of aromatic polyamide slurry, in particular to an aromatic polyamide slurry, a porous diaphragm and a preparation method thereof. Background technique [0002] At present, lithium battery separators are mainly porous films based on polyolefins, including PE separators, PP and PE multiple composite separators, and coated separators coated with inorganic ceramic materials, but are limited by polyolefin substrates. There is no fundamental difference in the fusing temperature of these types of diaphragms. With the increasing demand for the development of large-capacity lithium-ion power batteries, it is important to develop a new type of temperature-resistant lithium-ion diaphragm to promote the further development of lithium-ion batteries. meaning. [0003] Aramid (PPTA, PMIA, PBA, PSA) has a glass transition temperature of about 300°C, a thermal decomposition temperature greater than 500°C, and has the advantages of hi...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14C08L77/10C08J9/28
CPCY02E60/10
Inventor何庆一孙婉露孙庆津
Owner微宏先进膜公司