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Lithium battery diaphragm with toughened and modified polyvinylidene fluoride base body and preparation method of lithium battery diaphragm

A technology of polyvinylidene fluoride and lithium battery diaphragm, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of low liquid absorption rate and hard texture, and achieve the effect of cost reduction

Active Publication Date: 2016-05-18
HAIAN INST OF HIGH TECH RES NANJING UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of hard texture and low liquid absorption rate in the process of using PVDF as a lithium battery diaphragm, the present invention uses acrylate rubber with excellent heat resistance and solvent resistance as a flexible segment to modify PVDF, thereby reducing the PVDF Brittleness, improve the liquid absorption rate of PVDF, after the acrylate is vulcanized at high temperature in the later stage, the solvent resistance and strength of the film will be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: (the proportions are all mass ratios).

[0028] Step 1: Mix PVP:DMAc:PVDF=3:40:20 and dissolve slowly at 25°C to prepare polyvinylidene fluoride polyvinylidene fluoride solution (solution 1).

[0029] Step 2: Mix difluoropropane: azobisisobutyronitrile: acrylate rubber (glass transition temperature -15°C, Mooney viscosity 30) = 10:1:0.05, dissolve slowly at 30°C to prepare acrylate rubber solution (Solution 2).

[0030] Step 3: Solution 1: Solution 2 = 1:1, slowly add solution 2 to solution 1, stir slowly at a speed of 30r / min, mix the two and continue stirring for 3h until the solution is clear and free of particles or flocs .

[0031] Step 4: Disperse the fumed silica in the water-ethanol mixed solvent, slowly add KH-550 dropwise, where fumed silica: water: ethanol: KH-550=10:30:20:0.5, at 50-70 °C for constant temperature hydrolysis and modification for 3 hours, the mixed solvent was distilled off by vacuum distillation, and the prepared modified sil...

Embodiment 2

[0035] Embodiment 2: (the proportions are all mass ratios).

[0036] Step 1: Mix PVP:DMAc:PVDF=4:50:20 and slowly dissolve at 35°C to prepare a polyvinylidene fluoride solution (solution 1).

[0037] Step 2: Mix difluoropropane: azobisisobutyronitrile: acrylate rubber (glass transition temperature -25°C, Mooney viscosity 40) = 15:2:0.08, dissolve slowly at 35°C to prepare acrylate rubber solution (Solution 2).

[0038] Step 3: Solution 1: Solution 2=2:1.5, slowly add solution 2 to solution 1, stir slowly at a speed of 30r / min, mix the two and continue stirring for 3h until the solution is clear without particles or flocs .

[0039] Step 4: Disperse the fumed silica in the water-ethanol mixed solvent, slowly add KH-550 dropwise, where fumed silica: water: ethanol: KH-550=10:30:20:0.5, at 50-70 °C for constant temperature hydrolysis and modification for 3 hours, the mixed solvent was distilled off by vacuum distillation, and the prepared modified silica was pulverized into na...

Embodiment 3

[0043] Embodiment 3: (the proportions are all mass ratios).

[0044] Step 1: Mix PVP:DMAc:PVDF=4:50:30 and slowly dissolve at 35°C to prepare a polyvinylidene fluoride solution (solution 1).

[0045] Step 2: Mix trifluoropropane: benzoyl peroxide: acrylate rubber (glass transition temperature -30°C, Mooney viscosity 30) = 15:3:0.2, slowly dissolve at 30°C to prepare acrylate rubber solution (solution 2).

[0046] Step 3: Solution 1: Solution 2 = 2:1, slowly add solution 2 to solution 1, stir slowly at a speed of 30r / min, mix the two and continue stirring for 4h until the solution is clear and free of particles or flocs .

[0047] Step 4: Disperse the fumed silica in the water-ethanol mixed solvent, slowly add KH-550 dropwise, where fumed silica: water: ethanol: KH-550=10:30:20:0.5, at 50-70 °C for constant temperature hydrolysis and modification for 3 hours, the mixed solvent was distilled off by vacuum distillation, and the prepared modified silica was pulverized into nano...

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Abstract

The invention discloses a lithium battery diaphragm with a toughened and modified polyvinylidene fluoride base body and a preparation method of the lithium battery diaphragm. The preparation method of the lithium battery diaphragm includes the following steps of (1), preparation of a polyvinylidene fluoride (PVDF)-acrylic ester rubber (ACM) solution; (2), preparation of modified nano silica; (3), preparation of a polyvinylidene fluoride-modified nano silica hybrid solution; (4), membrane spraying and drying and membrane forming; (5), membrane hot-pressing processing. According to the lithium battery diaphragm with the toughened and modified polyvinylidene fluoride base body and the preparation method of the lithium battery diaphragm, the acrylic rubber (ACM) is adopted to modify the polyvinylidene fluoride (PVDF) so as to improve toughness of the polyvinylidene fluoride, so that the breakage rate in the production process is lowered, and the service life is prolonged; meanwhile, the surface energy of the PVDF membrane is improved, lithium battery electrolyte can better moisten the membrane, and performance of batteries is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of porous membrane materials, in particular to a lithium battery diaphragm and a preparation method thereof. Background technique [0002] PVDF film has good chemical stability, its heat distortion temperature is 112~145℃, and its long-term service temperature is -40~150℃, which is much higher than the normal use environment of batteries; It is corroded by halogens, and organic solvents such as aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, and aldehydes have no effect on it. Only a few chemicals such as oleum, strong alkali, ketones, and ethers can make it swell or partially dissolve. Compared with the traditional polyolefin lithium battery separator, PVDF film has more excellent heat resistance, deformation resistance and service life as a lithium battery separator. [0003] However, the PVDF film has a relatively hard texture, which is prone to film cracking during the production...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/417
CPCH01M50/403H01M50/446H01M50/411H01M50/449Y02E60/10
Inventor 陆洪彬孟祥康张秋香朱强高扬之吴培龙陈建国
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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