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Non-woven type power lithium battery diaphragm and preparation method thereof

A technology of lithium battery diaphragm and non-woven fabric, which is applied in the field of non-woven power lithium battery diaphragm and its preparation, which can solve the problems of low puncture resistance of the diaphragm and easy powder drop of the diaphragm, and achieve the improvement of electrical performance and The effect of safety and good liquid absorption performance

Active Publication Date: 2015-11-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, there have been no reports of filling silica-PMMA inorganic-organic composite particles into PET non-woven fabrics to prepare lithium battery separators. On the other hand, existing core-shell particles or PMMA particle-treated separators are prone to fall Powder problem, and the puncture strength of the diaphragm is not high

Method used

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  • Non-woven type power lithium battery diaphragm and preparation method thereof
  • Non-woven type power lithium battery diaphragm and preparation method thereof
  • Non-woven type power lithium battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Modification of silica: Weigh 1g of silica in a round bottom flask, add 30ml of methanol, γ-(methacryloyloxy)propyltrimethoxysilane accounting for 10% mass fraction of silica (KH570), ultrasonic dispersion is uniform, under the mechanical stirring of 1000r / min, add 1.0ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, under the condition of reflux of the condenser tube, heat up to 70°C for 5h, The obtained product was centrifuged and washed three times with methanol, and vacuum-dried at 50°C for 12 hours to obtain a white powdery double-bond modified silica;

[0037] (2) Preparation of core-shell particles: ultrasonically disperse 1 g of the double-bond modified silica obtained in step (1) and 0.08 g of PVP-K30 in 55 ml of deionized water, transfer the above solution to a round bottom flask and add 2 g of decompressed For distilled methyl methacrylate, insert a condenser tube and turn on the magnetic stirrer to stir for 15 minutes ...

Embodiment 2

[0043] (1) Modification of silica: Weigh 1g of silica in a round bottom flask, add 25ml of methanol, γ-(methacryloyloxy)propyltrimethoxysilane accounting for 12% mass fraction of silica (KH570), ultrasonic dispersion is uniform, under the mechanical stirring of 1000r / min, add 0.8ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, under the condition of reflux of the condenser tube, heat up to 70°C for 5h, The obtained product was centrifuged and washed three times with methanol, and vacuum-dried at 50°C for 12 hours to obtain a white powdery double-bond modified silica;

[0044] (2) Preparation of core-shell particles: ultrasonically disperse 1 g of the double-bond modified silica obtained in step (1) and 0.12 g of PVP-K30 in 90 ml of deionized water, transfer the above solution to a round bottom flask and add 3 g of decompressed For distilled methyl methacrylate, insert a condenser tube and turn on the magnetic stirrer to stir for 15 minutes ...

Embodiment 3

[0050] (1) Modification of silica: Weigh 1g of silica in a round bottom flask, add 20ml of methanol, γ-(methacryloyloxy)propyltrimethoxysilane accounting for 8% mass fraction of silica (KH570), ultrasonic dispersion is uniform, under the mechanical stirring of 1100r / min, add 0.6ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, under the condition of reflux of the condenser tube, raise the temperature to 75°C for 5h, The obtained product was centrifuged and washed three times with methanol, and vacuum-dried at 50°C for 12 hours to obtain a white powdery double-bond modified silica;

[0051] (2) Preparation of core-shell particles: ultrasonically disperse 1 g of the double-bond modified silica obtained in step (1) and 0.16 g of PVP-K30 in 120 ml of deionized water, transfer the above solution to a round bottom flask and add 4 g of decompressed For distilled methyl methacrylate, insert a condenser tube and turn on the magnetic stirrer to stir f...

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Abstract

The invention belongs to the technical field of battery diaphragm materials, and discloses a non-woven type power lithium battery diaphragm and a preparation method thereof. The preparation method comprises the following steps: modifying silicon dioxide with a silane coupling agent, forming double bonds on the silicon dioxide, initiating methyl methacrylate (MMA) polymerization, grafting and coating the silicon dioxide with polymethyl methacrylate (PMMA) and forming core-shell particles with good heat stability and good wettability on electrolyte; preparing a suspension liquid from the prepared core-shell particles, adding polyethylene glycol dimethacrylate as a fixing agent, immersing non-woven fabrics into the solution, and taking out and drying the non-woven fabrics to obtain a porous diaphragm; and immersing the diaphragm into a poly(vinylidene fluoride)-hexafluoropropene (PVDF-HFP) solution, volatilizing the solvent and baking the diaphragm at a high temperature of 120-140 DEG C, carrying out thermo-crosslinking on the polyethylene glycol dimethacrylate, and drying the polyethylene glycol dimethacrylate to obtain the non-woven type power lithium battery diaphragm. The diaphragm disclosed by the invention has the advantages of excellent heat stability and electrochemical property and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm materials, and in particular relates to a non-woven power lithium battery diaphragm and a preparation method thereof. Background technique [0002] Lithium battery separator is a kind of porous membrane. Its function is to separate the positive and negative electrodes of the lithium battery and prevent the short circuit caused by the contact between the positive and negative electrodes. Lithium ions can migrate between the positive and negative electrodes. The lithium battery separator directly determines a series of important properties such as the internal resistance, cycle performance, safety performance, and rate performance of the lithium battery. It is the key material that ranks first in technology and ranks second in cost in lithium batteries. There are mainly two commercial methods for preparing battery separators, one is dry stretching film forming method, such as celgard pol...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/489H01M50/491
CPCH01M50/403H01M50/446Y02E60/10
Inventor 刘维锦何海龙
Owner SOUTH CHINA UNIV OF TECH
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