A high-voltage-resistant supercapacitor electrode pole piece and its preparation method and application

A technology of supercapacitors and electrode pole pieces, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, nanotechnology for materials and surface science, etc., can solve poor conductivity, increase active material impedance, and affect capacitor work Performance and other issues, to achieve the effect of improving durability, avoiding instability, and avoiding the decline of electrochemical performance

Active Publication Date: 2019-01-08
清研储能科技(常州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage, due to the presence of a large number of functional groups on the surface of the activated carbon material, the electrolyte will decompose and the capacitor will fail rapidly; and if the activated carbon material is coated, although the contact between the functional groups and the electrolyte can be isolated, due to many coatings The conductivity of the material is poor, and the impedance of the active material is increased after coating, which affects the working performance of the capacitor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The active material graphene and activated carbon powder (graphene weight ratio 10%) are evenly mixed and then subjected to ALD deposition treatment, pre-coated with a layer of Al 2 o 3 cladding layer with a thickness of 2nm,

[0020] After testing, the specific surface area of ​​the active material has not changed after coating;

[0021] Weigh the total weight of the above-mentioned coated active material, conductive graphite, conductive carbon black, CMC, and SBR 200g, and the weight ratio is 88:2:3:3:4, and use water as a solvent to make a slurry through high-speed stirring, and then coat Clothed on aluminum foil, dried, and then made into positive and negative electrodes through rolling, cutting, and vacuum drying;

[0022] Use the above-mentioned positive electrode sheet and negative electrode sheet and weld the tabs respectively, select a commercially available paper diaphragm as the diaphragm, wind the positive and negative electrode sheets into a battery cell,...

Embodiment 2

[0025] The active material graphene and activated carbon powder (5% by weight of graphene) are evenly mixed and then subjected to ALD deposition treatment, pre-coated with a layer of ZrO 2 cladding layer with a thickness of 1.5nm,

[0026] After testing, the specific surface area of ​​the active material has not changed after coating;

[0027] Weigh the above-mentioned coated active material, conductive graphite, conductive carbon black, and LA132 with a total weight of 200g, and the weight ratio is 87:2:3:8, and use water as a solvent to make a slurry through high-speed stirring, and then coat it on aluminum foil. , dried, and then made into positive and negative electrodes through rolling, cutting, and vacuum drying;

[0028] Use the above-mentioned positive electrode sheet and negative electrode sheet and weld the tabs respectively, select a commercially available paper diaphragm as the diaphragm, wind the positive and negative electrode sheets into a battery cell, put it ...

Embodiment 3

[0031] Weigh activated carbon powder, graphene, conductive graphite, conductive carbon black, and PVDF with a total mass of 200g and mix them in a mass ratio of 85:5:3:2:5, and use NMP as a solvent to stir at a high speed to form a slurry, and then coat On the aluminum foil, dry, put the pole piece into the ALD equipment for atomic layer deposition Al 2 o 3 , deposited Al 2 o 3 The thickness is 2nm, and the deposited pole pieces are rolled, cut, and vacuum dried to make positive and negative pole pieces;

[0032] Use the above-mentioned positive electrode sheet and negative electrode sheet and weld the tabs respectively, select a commercially available paper diaphragm as the diaphragm, wind the positive and negative electrode sheets into a battery cell, put it into a cylindrical aluminum shell, and inject the solvent as acetonitrile, solute The electrolyte solution is 1mol / L tetraethylammonium tetrafluoroborate, and the capacitor is aged overnight after being sealed.

[00...

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PUM

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Abstract

The invention belongs to the technical field of chemical energy sources, and particularly relates to a high voltage resistant supercapacitor electrode pole piece as well as a preparation method and application thereof. The electrode pole piece comprises an active material, a coating layer is arranged on the surface of the active material, wherein the active material comprises activate carbon, the coating layer is a transition metal oxide, and the transition metal oxide coats the active material through an atomic layer deposition (ALD) technique. The transition metal oxide is deposited to avoid decomposing of an electrolyte by a functional group on the active material at the high voltage, so that the durability of the capacitor is prolonged, in addition, the electrochemical performance is prevented from being affected by the poor electrical conductivity of the material of the coating layer.

Description

technical field [0001] The invention belongs to the technical field of chemical energy, and in particular relates to a high-voltage-resistant supercapacitor electrode pole piece and a preparation method and application thereof. Background technique [0002] Supercapacitor, also called electric double layer capacitor, is a new type of energy storage component with high energy density. It can provide high power and long life. It is a new type of component with both capacitance and battery characteristics. Vehicles, pulse power systems and emergency power supplies have broad application prospects. Compared with traditional capacitors, it has higher energy density, higher power density and longer cycle life than batteries, so it combines the advantages of traditional capacitors and batteries, and is a chemical power source with broad application prospects. [0003] Since the appearance of supercapacitors on the market, they have received widespread attention from all over the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/46H01G11/86B82Y30/00
CPCY02E60/13
Inventor 孟涛姚年红宋勃谭晓文冯园
Owner 清研储能科技(常州)有限公司
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