Preparation of melt-blown polyphenylene sulfide non-woven fabric/aramid fiber nanofiber composite membrane

A polyphenylene sulfide and nanofiber technology, which is used in electrical components, electrochemical generators, circuits, etc., can solve the problems of uneven current density of lithium ion batteries, poor uniformity of pore size of composite membranes, and limited use of diaphragms. Excellent electrolyte wettability, short operating cycle, improved pore size and distribution

Active Publication Date: 2016-07-20
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the obtained composite membrane can withstand high temperature of 250°C, the pore size uniformity of the composite membrane is poor
Chinese Patent Publication No. CN104795525A, published on July 22, 2015, the name of the invention is "a kind of melt-blown polyphenylene sulfide non-woven lithium battery separator and its preparation method". Ether non-woven battery separator, although the prepared separator has high flame retardancy, high melting point, and high membrane rupture temperature, but the pore size of the separator is large and the uniformity is poor, resulting in uneven current density inside the assembled lithium-ion battery
The aramid fiber battery se...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] ① Preparation of para-aramid nanofiber suspension dispersion

[0031] Add N-methylpyrrolidone to the para-aramid resin jelly in the container to make the aramid resin jelly swell to a degree of swelling of 1.1-2, then stir at a high speed at a speed of 10000-15000r for 1-4min. The swollen aramid resin jelly body is broken into granular colloidal particles. Adding a dispersant to the swollen aramid resin jelly body and stirring and dispersing at a high speed at a speed of 4000-6000r for 5-10 minutes to obtain a uniform and stable para-aramid nanofiber suspension dispersion.

[0032] Wherein, the resin content of the aramid resin jelly body is 15% to 28%; the mass ratio of the aramid resin jelly body to N-methylpyrrolidone is 1:0.2 to 3; the swelling aramid resin jelly body and The mass ratio of the dispersant is 1:1-6; the diameter of the para-aramid nanofiber contained in the suspension dispersion liquid is 40-100nm, the fiber length is 5-25um, and the fiber mass perce...

Embodiment 1

[0045] ① Preparation of para-aramid nanofiber suspension dispersion

[0046] Add N-methylpyrrolidone to the para-aramid resin jelly body with a resin mass percentage of 15% in the container, so that the para-aramid resin jelly body swells, and the swelling degree is 1.1, and then high-speed stirring is carried out, and the stirring speed is 10000rpm, the stirring time is 4min, the p-aramid resin jelly body after swelling is broken into colloidal particles and dispersed in N-methylpyrrolidone to obtain a para-aramid colloidal mixture, and then to the obtained para-aramid glue Add water to the granular mixture, stir and disperse at a high speed under the condition of stirring speed of 4000rpm and stirring time of 10min, and obtain para-aramid nanofibers with a diameter of 40nm, a fiber length of 5um, and a fiber mass percentage of 6.25%. Aramid nanofiber suspension dispersion;

[0047] Wherein, the mass ratio of the aramid resin jelly body to N-methylpyrrolidone is 1:0.2; water...

Embodiment 2

[0059] ① Preparation of para-aramid nanofiber suspension dispersion

[0060] Add N-methylpyrrolidone to the para-aramid resin jelly body with a resin mass percentage of 15.5% in the container, so that the para-aramid resin jelly body swells, and the swelling degree is 1.12, and then high-speed stirring is carried out, and the stirring speed is 10200rpm, the stirring time is 4min, the para-aramid resin jelly after swelling is broken into colloidal particles and dispersed in N-methylpyrrolidone to obtain a para-aramid colloidal mixture, and then to the obtained para-aramid resin Add acetone to the granular mixture and stir at a high speed to disperse, the stirring speed is 4200rpm, and the stirring time is 10min to obtain para-aramid nanofibers with a diameter of 42nm, a fiber length of 5.5um, and a fiber mass percentage of 4.43%. Nanofiber Suspension Dispersion.

[0061] Wherein, the mass ratio of the aramid resin jelly body to N-methylpyrrolidone is 1:0.4; acetone is added to...

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Abstract

The invention relates to a preparation technology of a composite function membrane, in particular to preparation of a melt-blown polyphenylene sulfidenon-woven fabric a aramid fiber nanofiber composite membrane for a lithium ion battery, which belongs to the technical field of new energy materials. Aiming at the problems of poor imbibition capacity and insufficient temperature resistance commonly existed in an existing polyolefin composite membrane for the lithium ion battery, para-aramid nanofiber is prepared to be suspension dispersion liquid, the suspension dispersion liquid is coated on the upper surface of the melt-blown polyphenylene sulfide non-woven fabric, and the melt-blown polyphenylene sulfide non-woven fabric/aramid fiber nanofiber composite membrane is prepared. Compared with the existing polyolefin/aramid fiber nanofiber composite membrane, the electrolyte wettability, the heat stability, the mechanics and the chemical property of the melt-blown polyphenylene sulfide non-woven fabric/aramid fiber nanofiber composite membrane can be obviously improved. The preparation provided by the invention is simple in process step, easy to operate and low in cost, and has favorable industrial application future.

Description

technical field [0001] The invention relates to the preparation technology of a composite functional membrane, in particular to the preparation of a polyphenylene sulfide sprayed non-woven fabric / aramid fiber nanofiber composite diaphragm for a lithium-ion battery, and belongs to the technical field of new energy materials. Background technique [0002] Lithium-ion batteries are widely used, and the separator is the core part of the lithium-ion battery. At present, separators based on polyolefin materials are widely used. Polyolefin separators are easy to process and low in cost. However, polyolefin separators have poor electrolyte wettability, poor thermal stability, and obvious shrinkage and melting at high temperatures. Therefore, the performance of polyolefin separators is generally improved by composite methods. [0003] Aramid fiber has the advantages of high temperature resistance, high strength, no shrinkage and melting at high temperature, and good electrolyte wett...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/411H01M50/44
CPCH01M10/0525H01M50/449H01M50/403Y02E60/10
Inventor 王罗新罗丹庹星星许静吴静王桦
Owner WUHAN TEXTILE UNIV
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