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Modification method of diaphragm with polymethyl methacrylate-mica coating agent

A technology of polymethyl methacrylate and coating agent, applied in the direction of electrical components, circuits, battery pack components, etc., can solve problems affecting performance, matching problems, increasing battery internal resistance, etc., and achieve low raw material cost , matching improvement, and the effect of increasing the discharge capacity

Inactive Publication Date: 2018-12-07
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, coating the separator will increase the internal resistance of the battery, powder loss will affect the performance, and there are problems in matching the coated coating with the positive electrode, negative electrode, and electrolyte

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the reactor, mix acetone and dimethylformamide according to the volume ratio of 2:1 to prepare mixed solution 2. Add 2% by weight of the weight of the mixed solution 2 and sericite with a particle size of 100 nm, and ultrasonically vibrate for 20 min to obtain a uniformly mixed suspension. Add 3.3% of the weight of the mixed solution 2 and polyvinylidene fluoride-hexafluoropropylene with an average molecular weight of 1 million to the suspension, add 5% of the weight of the mixed solution 2 and polymethacrylic acid with an average molecular weight of 1.5 million Methyl ester, ultrasonic vibration for 30min. Stir at 60°C for 10 h to turn the solution in the reactor into a viscous liquid.

[0020] Put the two surfaces of the polyethylene monolayer film under atmospheric pressure glow discharge treatment for 15s each, coat the viscous liquid on the surface of the treated monolayer film, and dry it by blowing at 70°C to obtain the coated polymer physical film.

[0021...

Embodiment 2

[0024] In the reactor, mix butanone and dimethylformamide according to the volume ratio of 0.01:1 to prepare mixed solution 2. Add 0.1% by weight of the weight of the mixed solution 2 and phlogopite with a particle size of 1 nm, and ultrasonically oscillate for 1 min to prepare a uniformly mixed suspension. Add 0.5% by weight of the mixed solution 2 weight and polyvinylidene fluoride-hexafluoropropylene with an average molecular weight of 200,000 to the suspension, then add 1% by weight of the mixed solution 2 with an average molecular weight of 1,000,000 polymethyl methacrylate ester, ultrasonically oscillated for 10 min, and stirred at 50°C for 9 h to transform the solution in the reactor into a viscous liquid.

[0025] Put the two surfaces of the polypropylene monolayer film under the glow discharge of subatmospheric pressure and treat them for 10 s respectively, coat the viscous liquid on the surface of the treated monolayer film, and dry it by blasting at 70°C to obtain t...

Embodiment 3

[0028] In the reactor, mix butanone and dimethylformamide according to the volume ratio of 12:1 to prepare mixed solution 2. Add 5% by weight of the weight of the mixed solution 2 and conductive mica with a particle size of 5 μm, and ultrasonically vibrate for 30 minutes to obtain a uniformly mixed suspension. Add 20% by weight of the mixed solution 2 and polyvinylidene fluoride-hexafluoropropylene with an average molecular weight of 3,000,000 to the suspension, and then add 5% by weight of the mixed solution 2 with an average molecular weight of 1,800,000 polymethyl Methyl acrylate, ultrasonic vibration for 50min. Stir at 90°C for 12 h to turn the solution in the reactor into a viscous liquid.

[0029] Put one PP surface of the PP / PE / PP composite film under the condition of low-temperature plasma discharge, treat it for 10 minutes, coat the viscous liquid on the surface of the treated composite film, and dry it in vacuum at 120°C to obtain the coating polymer film.

[0030...

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PUM

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Abstract

The present invention relates to a modification method of a diaphragm with a polymethyl methacrylate-mica coating agent. The method for modifying a diaphragm with a mica coating agent is characterizedin that low-carbon ketone, coating agent and polyvinylidene fluoride are respectively added into a reaction kettle to prepare the diaphragm, wherein the low-carbon ketone, coating agent and polyvinylidene fluoride are respectively added into the reaction kettle. Hexafluoropropene, polymethyl methacrylate and the like, to obtain a viscous liquid. A substrate film is discharge, coated with a viscous liquid, and dry to obtain a coating film. The coating agent is sericite, muscovite, synthetic mica, conductive mica or phlogopite. The compatibility of the coating film with the positive electrode,negative electrode and electrolyte is obviously improved, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to a method for modifying a diaphragm by a polymethyl methacrylate-mica coating agent, in particular to a method for preparing a coating film that can be used for lithium batteries, lithium ion batteries, polymer batteries and supercapacitors, and belongs to batteries Technical field of membrane preparation. technical background [0002] Separators play an important role in the performance and safe use of lithium-ion batteries. According to the production process of the diaphragm, the diaphragm of lithium-ion batteries can be divided into dry film, wet film and composite film. Commercial separators are mainly polyolefin separators. However, the existing polyethylene (PE), polypropylene (PP), and polyolefin composite films (such as PP / PE / PP, PE / PP) will shrink and deform at high temperatures, and lithium-ion batteries using polyolefin films are safe. Hidden danger. Coating nano-materials such as alumina on the polyolefin film t...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/403H01M50/431Y02E60/10
Inventor 童庆松祖国晶张晓红胡志刚李颖席强童君开
Owner FUJIAN NORMAL UNIV
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