Method for improving breakdown strength and energy storage density of polymer

A technology of breakdown strength and energy storage density, applied in the field of energy storage materials, can solve the problems of the decrease of the breakdown strength of the composite, the decrease of the dielectric constant of the composite, the concentration of the electric field, etc., and meet the requirements of reducing microstructure defects and equipment conditions. Low, weakening effect of the tendency to agglomerate

Active Publication Date: 2018-04-13
SICHUAN UNIV
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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

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  • Method for improving breakdown strength and energy storage density of polymer
  • Method for improving breakdown strength and energy storage density of polymer

Examples

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Embodiment 1 and comparative example 1

[0042] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0043] Step 1: Hydroxylation modification of BNNSs:

[0044] 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;

[0045] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0046] 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

[0051] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0052] Step 1: Hydroxylation modification of BNNSs:

[0053] 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;

[0054] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0055] 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

[0059] A method for improving the breakdown strength of a composite by modifying boron nitride nanosheets, prepared by the following steps:

[0060] Step 1: Hydroxylation modification of BNNSs

[0061] 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;

[0062] Step 2: Dilute the neutralization mixture and wash the OH-BNNSs:

[0063] 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;

[0064] The product after multiple washings was dried in a vacuum oven for 24 ho...

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Abstract

The invention relates to the technical field of energy storage materials, and in particular relates to a method for improving the breakdown strength and energy storage density of a polymer. The methodfor improving the breakdown strength and energy storage density of the polymer comprises the following steps: adding 2-14 parts by weight of hydroxylated hexagonal boron nitride to 100 parts by weight of the polymer. The modified product of BNNSs (hexagonal boron nitride nanosheets) provided by the invention has better dispersion effects in the polymer, so that the agglomeration tendency of the BNNSs in the polymer is greatly weakened, and the method is very beneficial for the improvement of the breakdown strength and energy storage density of a composite capacitor.

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

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Application Information

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Patent Type & Authority Applications(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
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