Preparation method of active graphene/active carbon composite electrode plate

A composite electrode and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low solid content of electrode slurry, cracking and falling off of pole pieces, and low electrode density, so as to ensure continuity and thickness uniformity, increased electrode density, and high specific surface area

Active Publication Date: 2016-05-04
NINGBO CRRC NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional wet electrode preparation process is difficult to meet the device processing of composite electrodes. The introduction of active graphene with high specific surface area often causes problems such as low solid content of electrode slurry, low electrode density, and cracking and falling off of electrode pieces.

Method used

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  • Preparation method of active graphene/active carbon composite electrode plate
  • Preparation method of active graphene/active carbon composite electrode plate
  • Preparation method of active graphene/active carbon composite electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The reduced graphene prepared by chemical oxidation method and the pore-forming agent are mixed uniformly in a mass ratio of 1:8, and then immersed in an equal volume of water for 15 hours, and then dried. After drying, in an inert atmosphere at 960 ° C Activated for 1 hour, then washed with water, washed with 1M hydrochloric acid, washed with a large amount of water, and dried to obtain active graphene; wherein, the pore-forming agent is a composite pore-forming agent of potassium hydroxide and metallic nickel, and the composite pore-forming agent is The mass percentages of potassium hydroxide and metallic nickel are 90% and 10%; the particles of the active graphene are 8-9 μm, and the tap density is 0.3-0.4 g / cm 3 , the specific surface area is 1600-1800m 2 / g, the pore size is 3-5nm; the particle size of activated carbon is 7-10μm;

[0045] The activated carbon graphene and polyvinyl alcohol (PVA) are uniformly mixed according to the mass percentage of 98% and 2% re...

Embodiment 2

[0049] The reduced graphene prepared by the chemical oxidation method and the pore-forming agent are mixed uniformly in a mass ratio of 1:6, and then immersed in an equal volume of water for 12 hours, and then dried. After drying, in an inert atmosphere at 990 ° C Activated for 0.8 hours, then washed with water, washed with 1M hydrochloric acid, washed with a large amount of water, and dried to obtain active graphene; wherein, the pore-forming agent is potassium hydroxide; the particles of the active graphene are 8-9 μm, vibrating Solid density 0.3-0.4g / cm 3 , the specific surface area is 1600-1800m 2 / g, the pore size is 3-5nm; the particle size of activated carbon is 7-10μm;

[0050] Disperse the active graphene into a certain amount of dichlorobenzene (ODCB), and obtain the active graphene modified by the surface non-covalent bond through ultrasonic, centrifugation, drying and other steps;

[0051] The modified activated graphene and activated carbon are mixed with mass p...

Embodiment 3

[0054] The reduced graphene prepared by the chemical oxidation method and the pore-forming agent are mixed uniformly in a mass ratio of 1:9, and then immersed in an equal volume of water for 20 hours, and then dried. After drying, in an inert atmosphere at 940 ° C Activated for 1.5 hours, then washed with water, washed with 1M hydrochloric acid, washed with a large amount of water, and dried to obtain active graphene; wherein, the pore-forming agent is a composite pore-forming agent of potassium hydroxide and metallic nickel, and the composite pore-forming agent is The mass percentages of potassium hydroxide and metallic nickel are 95% and 5% respectively; the particles of the active graphene are 8-9 μm, and the tap density is 0.3-0.4 g / cm 3 , the specific surface area is 1600-1800m 2 / g, the pore size is 3-5nm; the particle size of activated carbon is 7-10μm;

[0055] Connect 4-bromophenyl group to active graphene by diazide reaction to obtain edge-modified active graphene; ...

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Abstract

The invention particularly relates to a preparation method of an active graphene/active carbon composite electrode plate, and belongs to the technical field of new energy storage devices. The preparation method comprises the following steps: mixing reduced graphene oxide with a pore-forming agent evenly at the mass ratio of 1 to (5-10); carrying out equivalent-volume impregnation in water for 8-24 hours, carrying out activating treatment at 600-1,000 DEG C in an inert atmosphere for 0.5-4 hours after drying, and cleaning and drying the product to obtain active graphene after activating; carrying out modified treatment on the active graphene; mixing the modified active graphene with the active carbon at the mass ratio of (10%-90%) to (10%-90%), mixing an active graphene/active carbon mixture, a conductive agent and an adhesive at the mass ratio of (75%-93%) to (2%-10%) to (5%-15%) and then laminating the mixture to form a carbon film; and pasting the carbon film and a current collector through a conductive adhesive, and carrying out heating and solidifying to obtain the active graphene/active carbon composite electrode plate. According to the preparation method of the active graphene/active carbon composite electrode plate, the thickness and the density of the final electrode plate are controllable; continuous mass preparation can be carried out; the capacity can also be improved when the prepared electrode plate is applied to a super capacitor; the internal resistance is reduced; the power density is improved; and the voltage endurance capability of the super capacity is improved.

Description

technical field [0001] The invention specifically relates to a preparation method of an active graphene / active carbon composite electrode sheet, which belongs to the technical field of new energy energy storage devices. Background technique [0002] In recent years, the increasingly prominent energy and environmental issues have made the clean storage and efficient utilization of electrical energy a topic of intensive research. As an important energy storage device, supercapacitors have the characteristics of high power density, fast charge and discharge, long cycle life of millions of times, safety and reliability, etc., and are widely used in electronic devices, rail transit, hybrid vehicles, etc. However, the current energy density of supercapacitors is low, and the energy density of commercial activated carbon supercapacitors is only 5-7Wh / kg. In order to meet the growing demand, the development of supercapacitors with high energy density and power density, as well as l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/34
CPCY02E60/13H01G11/86H01G11/24H01G11/34
Inventor 阮殿波郑超傅冠生
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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