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Novel hydrophobic silica aerogel composite separator for lithium ion battery

A lithium-ion battery and silicon dioxide technology, applied in electrical components, battery pack parts, circuits, etc., can solve the problems of difficulty in ensuring the wettability of diaphragms and organic electrolytes, and achieve light weight, improved electrochemical performance, light weight effect

Active Publication Date: 2017-02-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the use of hydrophilic aerogels for the modification of battery separators can improve the tensile strength and high temperature resistance of the separators to a certain extent, but the use of hydrophilic silica aerogels in organic electrolytes It is difficult to ensure the wettability between the separator and the organic electrolyte

Method used

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  • Novel hydrophobic silica aerogel composite separator for lithium ion battery
  • Novel hydrophobic silica aerogel composite separator for lithium ion battery
  • Novel hydrophobic silica aerogel composite separator for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.3646 g of the prepared hydrophobic silica airgel (such as figure 1 ) and 0.1823 g PVDF (polyvinylidene fluoride) were added to the beaker, and an appropriate amount of 1-methyl-2-pyrrolidone was added, stirred for 2 hours and then ultrasonicated for 20 minutes, and then the resulting slurry was coated on the PP (polypropylene) diaphragm, Adjust the scraper parameters of the coating machine (Pengxiang Yunda PX-TB-W type) to 180 μm, and the scraper moving speed to 7.5 cm / min for coating, and put the coated composite diaphragm into a 70°C normal pressure drying oven After drying for 24 h, a 43 μm-thick silicon dioxide gas-condensed composite membrane can be obtained, such as figure 2 shown.

[0028] I. Conduct heat resistance tests on composite separators, such as image 3 As shown, under the condition of 150 ℃, the shrinkage rate of the composite diaphragm is only 33% of the original diaphragm, II. the wettability test of the electrolyte is carried out to the c...

Embodiment 2

[0030] Weigh 0.4376 g of the prepared hydrophobic silica airgel and 0.055 g of PVDF (polyvinyl fluoride) into a beaker, add an appropriate amount of N,N-dimethylformamide (DMF), stir for 2 hours, and then sonicate for 20 Minutes later, the resulting slurry is coated on the PP (polypropylene) diaphragm, adjust the scraper parameter of the coating machine to 150 μm, and the scraper moving speed is 7.5 cm / s for coating, and put the coated PP diaphragm into a 60°C Dry in a vacuum oven for 24 h to obtain a 33 μm-thick silicon dioxide gas-condensed composite diaphragm.

[0031] I. Carry out the heat resistance test on the composite diaphragm. Under the condition of 150℃, the shrinkage rate of the composite diaphragm is only 57% of the original diaphragm. II. Carry out the wettability test of the electrolyte on the composite diaphragm, which shows that the composite diaphragm is better than the original PP The wettability of the diaphragm has been significantly improved. III. With li...

Embodiment 3

[0033] Weigh 0.2520 g of the prepared hydrophobic silica airgel and 0.076 g of PVDF (polyvinylidene fluoride) into the beaker, add an appropriate amount of 1-methyl-2-pyrrolidone, stir for 2 hours and then ultrasonic for 20 minutes, then The obtained slurry is coated on the PE (polyethylene) diaphragm, the parameter of the scraper of the coating machine is adjusted to 100 μm, and the moving speed of the scraper is 7.5 cm / s for coating, and the coated PE diaphragm is placed in a 60°C normal pressure drying In the oven, dry for 24 h to obtain a 30 μm-thick silicon dioxide gas-condensed composite diaphragm.

[0034] I. Test the heat resistance of the composite diaphragm. Under the condition of 120°C, the shrinkage rate of the composite diaphragm is only 57% of the original diaphragm. II. Conduct the wettability test of the electrolyte on the composite diaphragm, which shows that the composite diaphragm is better than the original PE The wettability of the separator has been signi...

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Abstract

The invention discloses a novel hydrophobic silica aerogel composite separator for a lithium ion battery. The separator is a hydrophobic silica aerogel coating layer coated on surfaces of conventional separators with different thicknesses, and the thickness of the silica aerogel coating layer is 1-25 micrometers. A preparation method of the hydrophobic silica aerogel composite separator comprises the steps of firstly, preparing hydrophobic silica aerogel; secondly, dispersing the hydrophobic silica aerogel into an organic solvent, and adding a certain proportion of binding agent to prepare paste; and finally, uniformly coating the obtained paste on the surfaces of the conventional separators with different thicknesses, and performing drying to obtain the hydrophobic silica aerogel composite separator. The hydrophobic silica aerogel composite separator has the advantages of light weight and good heat resistance, the silica aerogel of an organic electrolyte with high wettability is used as the coating layer material, and the heat resistance, the wettability and the electrochemical performance of a polyolefin separator are greatly improved on the premise of almost no increase on the mass of the separator.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a novel hydrophobic silicon dioxide airgel composite separator for lithium ion batteries and a preparation method thereof. [0002] technical background [0003] Lithium-ion batteries play a pivotal role in everyday life. Whether it is a smartphone or a tablet, a camera or a laptop, lithium-ion batteries are indispensable. In addition, lithium-ion batteries are also the first choice for battery systems used in electric vehicles. To some extent, the success or failure of these mobile products depends largely on the performance of lithium-ion batteries. As an important part of the lithium-ion battery, the performance of the diaphragm affects the capacity, safety performance and cycle performance of the lithium-ion battery, and plays a decisive role in the overall performance of the lithium-ion battery. At present, most commercial lithium-ion battery sepa...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14C09D1/00C09D7/12H01M50/403H01M50/417H01M50/431H01M50/451
CPCC09D7/65C09D1/00H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 陈卫华冯祥明冯冠华李子贺郑金云米立伟刘春太
Owner ZHENGZHOU UNIV
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