Preparation method of ultra-thin inorganic/organic composite dielectric layer material for supercapacitor

A technology of supercapacitor and dielectric layer, which is applied in the direction of capacitor dielectric layer and capacitor parts, can solve the problems of low content and lower dielectric constant of polyimide, achieve simple technical process, improve dielectric performance and durability Effects of breakdown voltage and ease of molding

Inactive Publication Date: 2012-11-14
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric constant of the prepared film is lower than that of inorganic ceramic materials, because the content of inorganic ceramic powder in the blend system is low and dispersed in the polymer matrix, and the fluorine atoms introduced into the polyimide molecular chain , also reduces the dielectric constant of the polyimide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] in N 2 Under protection and room temperature conditions, add 0.17g DBN and 2.25g ODA to 74.12g m-cresol solvent, under magnetic stirring, dissolve the two diamine monomers, then drop 4.03gBTDA into diamine m-cresol at a constant speed solution, make the mixed system mechanically stirred, pass N 2 , under the condition of reflux of the condenser tube, heated to 140°C at a rate of 10°C / min for 24 hours to obtain a viscous polyimide solution containing nitrile groups; take 7.5g of this polyimide solution and dissolve it in In 42.5g of DMF, a dilute solution of nitrile-group-containing polyimide was prepared, and 10.71g of lead tungstate powder with a particle size of 100nm was added to this dilute solution, which was uniformly mixed and ball-milled for 8 hours to obtain a nitrile-group-containing polyimide A dielectric solution of lead tungstate powder coated with a dilute solution; the dielectric solution is vacuum defoamed and then cast into a dielectric layer material ...

Embodiment 2

[0034] in N 2 Under protection and room temperature, add 1.77g DCB and 0.42g DABP to 21.16g m-cresol solvent, dissolve the two diamine monomers under magnetic stirring, and then drop 3.10g ODPA into the diamine m-cresol solution at a constant speed , so that the mixed system is mechanically stirred and N 2, under the condition of reflux of the condenser tube, heated to 200°C at a rate of 10°C / min and reacted for 24h to obtain a viscous polyimide solution containing nitrile groups; take 2.4g of this polyimide solution and dissolve it in In 27.6g of DMF, a dilute solution of nitrile-group-containing polyimide was prepared, and 7.5g of lead tungstate powder with a particle size of 200nm was added to this dilute solution, which was uniformly mixed and ball-milled for 6 hours to obtain a nitrile-group-containing polyimide A dielectric solution of lead tungstate powder coated with a dilute solution; the dielectric solution is vacuum defoamed and then cast into a dielectric layer ma...

Embodiment 3

[0036] Under N2 protection and room temperature, add 0.47gDBN and 0.32gDABP to 19.21g of m-cresol solvent, under magnetic stirring, dissolve the two diamine monomers, and then drop 2.60g of BPADA into diamine m-cresol at a constant speed solution, make the mixed system mechanically stirred, pass N 2 , under the condition of reflux of the condenser tube, heated at a rate of 10 °C / min to 170 °C for 24 hours to obtain a viscous polyimide solution containing nitrile groups; take 2.5 g of this polyimide solution and dissolve it in In 22.5g of DMF, a dilute solution of nitrile-group-containing polyimide was prepared, and 3.33g of lead tungstate powder with a particle size of 150nm was added to this dilute solution, which was uniformly mixed and ball-milled for 7 hours to obtain nitrile-group-containing polyimide A dielectric solution of lead tungstate powder coated with a dilute solution; the dielectric solution is vacuum defoamed and then cast into a dielectric layer material with ...

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Abstract

The invention relates to a preparation method of an ultra-thin inorganic/organic composite dielectric layer material for a supercapacitor. The method comprises the following steps of selecting lead tungstate as a matrix organic material, selecting nitrile group-containing polyimide as an organic polymer phase, synthesizing the lead tungstate and the nitrile group-containing polyimide into a novel nitrile group-containing polyimide solution through ternary copolymerization, coating lead tungstate ceramic powder with the nitrile group-containing polyimide solution, and performing vacuum defoamation, casting film formation, solvent evaporation, calendering and annealing on the coated lead tungstate ceramic powder to form the ultra-thin inorganic/organic composite dielectric layer material. Compared with the traditional polymer/barium titanate series composite dielectric layer material, the ultra-thin inorganic/organic composite dielectric layer material has the advantages of simple process. The thickness of the prepared ultra-thin inorganic/organic composite dielectric layer material is less than or equal to 3 mum, the dielectric constant is up to 44,700, the breakdown-resistant voltage is up to 400kV/mm, and the dielectric loss factor is less than 1 percent. The ultra-thin inorganic/organic composite dielectric layer material can be used for preparing a large-capacity multi-layer ceramic capacitor.

Description

technical field [0001] The invention relates to a preparation method of an ultra-thin inorganic / organic composite dielectric layer material for a supercapacitor. Background technique [0002] Supercapacitor is a product that appeared in the late 1970s. It subverts the traditional energy storage method (directly storing and releasing electrical energy without going through the process of chemical energy), and is a revolution in energy storage equipment. The energy loss of the supercapacitor is very small, and the charge and discharge efficiency is as high as 98%, while that of the lead-acid battery is only 70%. Especially since the supercapacitor has no chemical changes, it has no pollution to the environment; the supercapacitor also has a long cycle life, high power density, It has the advantages of fast charging and discharging speed, good high temperature performance, flexible capacity configuration, maintenance-free, and convenient energy recovery. It is a new type of gre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/07
CPCY02E60/13
Inventor 刘必前汪前东王丽华杨海军任晓灵
Owner INST OF CHEM CHINESE ACAD OF SCI
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