Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method to improve the breakdown strength and energy storage density of polymers

A technology of breakdown strength and energy storage density, applied in the field of energy storage materials, can solve the problems of electric field concentration, decrease of composite breakdown strength, decrease of composite dielectric constant, etc., so as to weaken the tendency of agglomeration and reduce microstructure defects. , the effect of low requirements on equipment conditions

Active Publication Date: 2019-07-12
SICHUAN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the further improvement of the energy storage density of BNNSs-based nanocomposites is limited by the agglomeration of BNNSs, the poor interfacial interaction with the polymer matrix, the microstructural defects in the nanocomposites caused by the above two, and the low density of BNNSs themselves. The limit of the dielectric constant (≈5); more microstructural defects in the nanocomposite means more air is introduced into the composite, and the low dielectric constant of air will lead to electric field concentration in the composite, causing The breakdown strength of the composite drops sharply
In addition, the low dielectric constant of BNNSs itself can also cause a decrease in the dielectric constant of the composite

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method to improve the breakdown strength and energy storage density of polymers
  • A method to improve the breakdown strength and energy storage density of polymers
  • A method to improve the breakdown strength and energy storage density of polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0043] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0044] Step 1: Hydroxylation modification of BNNSs:

[0045] Add 1g of BNNSs to 1000ml of nitric acid, then ultrasonicate for 5h while stirring at room temperature, then add the mixture into a high-pressure reactor, and stir at 150°C for 24h;

[0046] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0047] Dilute the product of step 1 to 2L with deionized water, and dissolve NaOH in water to obtain an aqueous sodium hydroxide solution. After adjusting the pH of the mixture to neutral, vacuum-assisted suction filtration is used; the product obtained by suction filtration is dispersed in 1L to Ultrasound in ionized water for 15 minutes at room temperature with an ultrasonic power of 100 W, then filter again, and repeat this process 4 times; place the product after multiple washings in a vacuum oven to dry for 24 hours to...

Embodiment 2 and comparative example 2

[0052] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0053] Step 1: Hydroxylation modification of BNNSs:

[0054] Add 1.5g of BNNSs to 1500ml of nitric acid, then sonicate for 5h while stirring at room temperature, then add the mixture into a high-pressure reactor, and stir at 150°C for 24h;

[0055] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0056] Dilute the product of step 1 to 3L with deionized water, and dissolve NaOH in water to obtain an aqueous sodium hydroxide solution. After adjusting the pH of the mixture to neutral, vacuum-assisted suction filtration is used; the product obtained by suction filtration is dispersed in 1.5L Ultrasound in deionized water for 15 minutes at room temperature and with an ultrasonic power of 100 W, then filter again, and repeat this process 4 times; place the product after multiple washings in a vacuum oven to dry for 24 hours ...

example example 3 and comparative example 3

[0060] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0061] Step 1: Hydroxylation modification of BNNSs

[0062] Add 0.5g of BNNSs to 500ml of nitric acid, then sonicate for 5h while stirring at room temperature, then add the mixture into a high-pressure reactor, and stir at 150°C for 24h;

[0063] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0064] Dilute the product of step 1 to 1L with deionized water, and dissolve NaOH in water to obtain an aqueous sodium hydroxide solution. After adjusting the pH of the mixture to neutral, vacuum-assisted suction filtration is used; the product obtained by suction filtration is dispersed in 0.5L Ultrasound in deionized water for 15 minutes at room temperature and with an ultrasonic power of 100W, then filter again, and repeat this process 4 times;

[0065] The product after multiple washings was dried in a vacuum oven for 24 ho...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
energy densityaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of energy storage materials, in particular to a method for improving the breakdown strength and energy storage density of polymers. The invention provides a method for improving the breakdown strength and energy storage density of a polymer. The method is: adding hydroxylated hexagonal boron nitride to the polymer, wherein the mass ratio of the polymer to the hydroxylated hexagonal boron nitride is : 100 parts by weight of polymer, 2 to 14 parts by weight of hydroxylated hexagonal boron nitride. The BNNSs modified product provided by the invention has a better dispersion effect in polymers, greatly reduces the tendency of BNNSs to agglomerate in polymers, and is very beneficial to the improvement of the breakdown strength and energy storage density of composite capacitors.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for improving the breakdown strength and energy storage density of polymers. Background technique [0002] Dielectric capacitors are attractive for energy storage due to their ultrahigh charge-discharge rates. Compared with traditional ceramic capacitors, polymer dielectric materials have the advantages of easy processing, light weight, low cost and good flexibility. However, the relatively low energy density greatly limits its application in modern electronic devices that are integrated, lightweight, and miniaturized. For example, the most advanced commercial film capacitor, biaxially oriented polypropylene film (BOPP), has an energy storage density of only 2.2 J cm -3 . Therefore, a new generation of high energy density capacitors has gained more and more attention. [0003] Theoretically, the energy storage density of dielectric materials depends o...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/02C08K3/38C08L23/06C08L33/12C08L27/16C09K5/06
CPCC08K3/38C08K9/02C08K2003/387C08L23/06C08L27/16C08L33/12C08L2203/16C09K5/06
Inventor 陈枫吴玲玉吴凯傅强
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com