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Non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature and preparation method

A lithium battery separator, high temperature stability technology, applied in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve problems such as restricting application and unstable dispersion, and achieve good stability.

Active Publication Date: 2015-10-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to deal with non-woven fabric membranes with larger membrane pores, the concentration of silica core-shell particle dispersion must be increased, but as the concentration of the dispersion increases, the dispersion will become more and more unstable; in addition, At present, many lithium battery separators prepared by non-woven fabric modification do not have a closed-cell mechanism, which restricts their application.

Method used

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  • Non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature and preparation method
  • Non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature and preparation method
  • Non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Modification of silicon dioxide: Weigh 1g of silicon dioxide with an average particle size of 10nm in a round bottom flask, add 24ml of methanol, γ-(methacryloyloxy) which accounts for 10% of the mass fraction of silicon dioxide Propyltrimethoxysilane (KH570), ultrasonically dispersed evenly, under the mechanical stirring of 1000r / min, add 0.7ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, under the condition of reflux in the condenser tube, heat up React at 70°C for 5h, centrifuge wash the obtained product three times with methanol, and vacuum dry at 50°C for 12h to obtain white powdery double bond modified silica;

[0038] (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 in 68 ml of deionized water, dissolve 0.033 g of potassium persulfate in deionized water and add the above Stir evenly in the dispersion, heat up to 75°C after blowin...

Embodiment 2

[0046] (1) Modification of silicon dioxide: Weigh 1g of silicon dioxide with an average particle size of 50nm in a round bottom flask, add 30ml of methanol, γ-(methacryloxy)propane, which accounts for 12% of the mass fraction of silicon dioxide Trimethoxysilane (KH570), ultrasonically dispersed evenly, under mechanical stirring at 1200r / min, add 1.0ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, and raise the temperature to After reacting at 75°C for 5 hours, the obtained product was centrifuged and washed three times with methanol, and vacuum-dried at 50°C for 12 hours to obtain white powdery double-bond modified silica;

[0047] (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 in 80 ml of deionized water, dissolve 0.04 g of potassium persulfate in deionized water and add the above Stir evenly in the dispersion, heat up to 75°C after blowing nitr...

Embodiment 3

[0053] (1) Modification of silicon dioxide: Weigh 1g of silicon dioxide with an average particle size of 100nm in a round bottom flask, add 25ml of methanol, γ-(methacryloyloxy)propane which accounts for 11% of the mass fraction of silicon dioxide Trimethoxysilane (KH570), ultrasonically dispersed evenly, under mechanical stirring at 1000r / min, add 0.9ml of ammonia water drop by drop, after stirring for 1h, adjust the speed to 60r / min, and raise the temperature to After reacting at 70°C for 5 hours, 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;

[0054] (2) Preparation of core-shell particles: ultrasonically disperse 1 g of the double-bond modified silica obtained in step (1) and 0.28 g of PVP in 80 ml of deionized water, dissolve 0.119 g of potassium persulfate in deionized water and add the above Stir evenly in the dispersion liquid, heat up to 75°C after...

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Abstract

The invention belongs to the technical field of battery diaphragm materials and discloses a non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature and a preparation method. The preparation method comprises the steps of using a silane coupling agent to modify silicon dioxide, so as to enable the silicon dioxide to have double bonds, and then triggering MMA and TMPTA to polymerize, so as to obtain core-shell particles good in heat stability and good in wettability to electrolyte; preparing the core-shell particles into dip-coating liquid, immersing non-woven into the dip-coating liquid, taking out the non-woven, and drying to obtain a core-shell particle modified membrane; then immersing the modified membrane into a mixed solution of PVDF-HFP and PEGDMA, taking out, and vacuum drying to obtain the non-woven type lithium battery diaphragm realizing hole closing at low temperature and being stable at high temperature. The diaphragm has the low-temperature hole closing property, high-temperature hole stability and excellent electrochemical performance, and has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragm materials, and in particular relates to a low-temperature closed-cell high-temperature stable non-woven lithium battery diaphragm and a preparation method thereof. Background technique [0002] The basic role of the battery separator in a lithium battery is to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. 3C products including computer (Computer), communication (Communication) and consumer electronics (Consumer Electronics) are the main fields of lithium battery application. For the lithium battery of 3C products, only PP separator and PE separator are used, and its performance can be better. satisfaction. However, with the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicles. Lithium batteries put forward more stringe...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/058H01M50/403H01M50/431H01M50/44
CPCH01M10/058H01M50/40H01M50/409H01M50/403Y02E60/10Y02P70/50
Inventor 刘维锦何海龙
Owner SOUTH CHINA UNIV OF TECH
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