CN110491685B - Preparation method and application of graphene supercapacitor slurry - Google Patents

Preparation method and application of graphene supercapacitor slurry Download PDF

Info

Publication number
CN110491685B
CN110491685B CN201910672382.5A CN201910672382A CN110491685B CN 110491685 B CN110491685 B CN 110491685B CN 201910672382 A CN201910672382 A CN 201910672382A CN 110491685 B CN110491685 B CN 110491685B
Authority
CN
China
Prior art keywords
graphene
stirring
kneading
slurry
adhesive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910672382.5A
Other languages
Chinese (zh)
Other versions
CN110491685A (en
Inventor
陈成猛
王振兵
苏方远
孔庆强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanxi Institute of Coal Chemistry of CAS
Original Assignee
Shanxi Institute of Coal Chemistry of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanxi Institute of Coal Chemistry of CAS filed Critical Shanxi Institute of Coal Chemistry of CAS
Priority to CN201910672382.5A priority Critical patent/CN110491685B/en
Publication of CN110491685A publication Critical patent/CN110491685A/en
Application granted granted Critical
Publication of CN110491685B publication Critical patent/CN110491685B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/22—Electrodes
    • H01G11/30—Electrodes characterised by their material
    • H01G11/32—Carbon-based
    • H01G11/36—Nanostructures, e.g. nanofibres, nanotubes or fullerenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54—Electrolytes
    • H01G11/58—Liquid electrolytes
    • H01G11/60—Liquid electrolytes characterised by the solvent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/54—Electrolytes
    • H01G11/58—Liquid electrolytes
    • H01G11/62—Liquid electrolytes characterised by the solute, e.g. salts, anions or cations therein
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/68—Current collectors characterised by their material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
    • H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/13—Energy storage using capacitors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nanotechnology (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

The invention relates to a preparation method of graphene supercapacitor slurry and a graphene supercapacitor prepared from the graphene supercapacitor slurry, and belongs to the technical field of supercapacitor energy storage devices. The preparation method of the graphene supercapacitor slurry comprises the following steps: adding graphene powder into a dispersion liquid of an adhesive, stirring and dispersing to prepare an adhesive dispersion liquid containing graphene, kneading and stirring the graphene adhesive dispersion liquid and an electrode active material in batches, diluting with a solvent, stirring and dispersing to finally obtain a slurry, and preparing the supercapacitor through coating, rolling, slitting, winding, injecting and other processes. The slurry is simple and rapid in preparation method, continuous production is easy to realize, the obtained slurry graphene is good in dispersibility, the prepared pole piece has low membrane resistivity, and the prepared graphene supercapacitor has high energy density, low direct-current resistance and high power density.

Description

Preparation method and application of graphene supercapacitor slurry
Technical Field
The invention belongs to the technical field of new energy storage devices, and particularly relates to a preparation method of graphene supercapacitor slurry and a graphene supercapacitor prepared from the graphene supercapacitor slurry.
Background
The super capacitor has the advantages of high power density, long cycle life, excellent low temperature and safety performance and the like, and has huge application prospects in the fields of start-stop power supplies of electric automobiles, urban public rail transit, large-scale photovoltaic and wind power energy storage of the electric automobiles. In order to meet the increasing demands, the invention is always a hot point for research and invention in order to improve the performance of the super capacitor from the aspects of materials, processes and the like and prepare capacitor products with high energy density, high power density and long cycle life.
Graphene has a great application prospect in the field of supercapacitors due to its large specific surface area and high conductivity, but graphene must be well dispersed in the use process to exert its excellent characteristics, however, the problem of graphene dispersion has been concerned by the scientific and industrial circles, and usually auxiliary materials such as dispersants are added, but on one hand, the addition of dispersants brings increased cost, on the other hand, these materials do not have any benefit to the improvement of supercapacitors, but rather, energy density and power density are reduced. The graphene-like carbon nanomaterial has a high oil absorption value, so that graphene with low solid content has high viscosity, and therefore, the graphene is directly added into the active electrode, so that the graphene is difficult to disperse, the excellent performance of the graphene cannot be exerted, and the solid content of the slurry is reduced, so that the surface density and the compaction density of a pole piece are influenced, and the energy density of a capacitor is further influenced. Patent CN 106847534 is an acid treatment of activated carbon, in which graphene oxide is dissolved in a solvent and then undergoes a condensation reaction with a polymer to obtain a graphene oxide colloid with positive charges on the surface, and a graphene oxide-coated activated carbon composite slurry is formed by an electrostatic self-assembly technique, so that graphene and an active material can be well compounded.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of graphene supercapacitor slurry and a graphene supercapacitor prepared by using the graphene supercapacitor slurry, in particular to a preparation method of capacitance composite electrode slurry.
The invention is realized by the following technical scheme.
A preparation method of graphene supercapacitor slurry comprises the following steps:
1) graphene adhesive dispersion liquid preparation
Adding graphene into a dispersion liquid of an adhesive for stirring and dispersing, wherein the mass ratio of the graphene to the adhesive is 1: 2-1: 20, the solid content of the graphene is 0.1% -10%, the stirring speed is 10-100 r/min, the dispersing speed is 800-3000 r/min, and the stirring and dispersing time is 30-600 min;
2) kneading and mixing the electrode active material and the graphene binder dispersion liquid step by step
Firstly, taking 20-70% of the total amount of the graphene adhesive dispersion liquid prepared in the step 1), adding an active electrode material into the adhesive graphene mixed liquid, and kneading, stirring and mixing in a first step, wherein the electrode active material comprises a conductive agent and one or a mixture of more of active carbon, active carbon fibers, capacitance carbon, graphite or carbon materials in other forms, and the specific surface area of the active carbon material is more than 1500m2The solid content of kneading is 30-90%, the stirring speed is 5-100 r/min, and the kneading time is 10-180 min; then adding the rest graphene adhesive dispersion liquid prepared in the step 1) into the mixture obtained after the first-step kneading and stirring, and carrying out second-step kneading and stirring, wherein the solid content of the second-step kneading is 25-85%, and the whole material ratio is as follows: the active material is graphene adhesive dispersion liquid, wherein the conductive agent accounts for 70-95%, 4.5-20%, 0.5-10%, the kneading and stirring speed is 5-100 r/min, and the kneading and stirring time is 30-600 min;
3) adding a solvent to dilute and disperse
After the step 2) is finished, adding a solvent into a stirring tank for dilution, stirring and dispersion, wherein the whole stirring and dispersion process is carried out in a vacuum environment, the main purpose of dispersion under the vacuum condition is to eliminate bubbles and avoid influencing the dispersion uniformity of materials, the solid content is 20-80%, the stirring speed is 10-100 r/min, the dispersion speed is 500-3000 r/min, the stirring and dispersion time is 10-600 min, and the graphene supercapacitor slurry is prepared, wherein the viscosity range of the graphene supercapacitor slurry is 3000-8000 mPa.S.
Further, the graphene in the step 1) is prepared by an oxidation-reduction method, a physical stripping method, a physical intercalation or a chemical intercalation, and the adhesive is one or more of polyvinylidene fluoride, polytetrafluoroethylene, styrene butadiene rubber, sodium carboxymethylcellulose and sodium alginate.
Further, the concentration of graphene in the graphene adhesive dispersion liquid in the step 1) is 0.5-5%, the concentration of graphene is too low, a complete conductive network cannot be formed, the internal resistance of the super capacitor is increased, the concentration of graphene is too high, the dispersion difficulty is high, the solid content of slurry is reduced, and the stability is poor; the ratio of the graphene to the adhesive is 1: 5-1: 15, the ratio is too low, the content of the adhesive is low, and the electrode plate is easy to fall off powder to influence the performance of the device. The proportion is too high, the proportion of the adhesive is too high, the internal resistance is increased, and the energy density of the device is reduced.
Further, in the step 1), the stirring speed is 20-50 r/min, the dispersing speed is 1000-2000 rpm, the stirring dispersing time is 60-300 min, the stirring dispersing speed is too low, the time is too short, the mixing among particles is not facilitated, the stirring dispersing speed is too high, the stirring time is too long, the stirring efficiency is reduced, and the loss of equipment is large.
Further, the solid content of the first-step kneading and stirring in the step 2) is 30-90%, the first-step kneading and stirring speed is 5-100 r/min, and the kneading time is 10-180 min; and in the second step, the solid content of the second step is 25-85%, and the kneading and stirring time is 30-600 min.
Further, the solvent in the step 3) is one of water, ethanol and nitrogen methyl pyrrolidone or a mixed solvent of a plurality of solvents.
Further, in the step 3), the stirring speed is 20-50 rpm, the dispersing speed is 1000-2000 rpm, and the stirring dispersing time is 60-300 min.
A graphene supercapacitor prepared by using graphene supercapacitor slurry is prepared by coating, rolling, slitting, winding and injecting the prepared graphene supercapacitor slurry to prepare the graphene supercapacitor, wherein a current collector used for coating is a carbon-coated aluminum foil, and an electrolyte solvent injected into the capacitor comprises one or more of ethylene carbonate, propylene carbonate, gamma-butyrolactone, dimethyl carbonate, diethyl carbonate, butylene carbonate, ethyl methyl carbonate and acetonitrile; solute in the electrolyte is at least one of sodium perchlorate, sodium hexafluorophosphate, sodium trifluoromethanesulfonate, sodium bis (trifluoromethanesulfonyl) imide, sodium bisoxalate, sodium hexafluoroarsenate, tetraethylene glycol dimethyl ether, tetraethylammonium tetrafluoroborate and spiro quaternary ammonium salt.
The method comprises the steps of premixing and dispersing graphene and a binder solution, kneading and stirring active materials step by step, adding a solvent, stirring and dispersing at a high speed, premixing and dispersing the graphene and the binder solution, kneading and stirring the active materials step by step, adding the solvent, stirring and dispersing at a high speed, and compared with the prior art, the method has the following beneficial effects that:
1. the graphene can be dispersed at low cost, and meanwhile, no dispersing agent is introduced, so that the proportion of the electrode active material is favorably improved;
2. the obtained slurry has high solid content, can realize high-surface-density coating, solves the problems of low solid content and low coating surface density of the traditional stirring process, and further improves the energy density of the super capacitor;
3. the process operation is simple, the standardized and stabilized production is easy to realize, the slurry after being stirred can be directly connected into coating equipment for subsequent processing without further treatment, and the production efficiency is greatly improved.
Detailed Description
The invention will be further illustrated by the following examples and accompanying tables. In the following examples, all proportions are mass ratios unless otherwise specified.
Example 1
1) Adding graphene into a dispersion liquid of sodium carboxymethylcellulose (CMC), wherein the concentration of the graphene is 0.5%, and the ratio of the graphene to the CMC is 1: 8;
2) after the step 1), adding the obtained graphene adhesive solution into a stirring tank and activated carbon in batches for kneading and mixing, wherein the solid content of the first kneading and mixing is 50%, the kneading and stirring speed is 20rpm, and the kneading and stirring time is 20 min; after the first stirring is finished, adding the dispersion liquid of the rest graphene and the adhesive, wherein the whole solid content of the mixed sample is 40%, kneading and stirring at 20rpm for 120min, and the whole proportion of the activated carbon, the adhesive and the graphene is 95.5:4: 0.5;
3) adding deionized water after the step 2) is finished, stirring and dispersing, wherein the whole solid content of the slurry is 38%, the stirring speed is 50r/min, the dispersing speed is 2000r/min, and the stirring and dispersing time is 60 min; in addition, this step was carried out under vacuum throughout the stirring dispersion process, and the viscosity and solid content were measured after the stirring of the above slurry was completed.
Then coating and rolling to obtain the super capacitor pole piece using the slurry, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
Example 2
1) Adding graphene into a dispersion solution of sodium carboxymethylcellulose (CMC), wherein the concentration of the graphene is 0.5%, and the ratio of the graphene to the CMC is 1: 15;
2) after the step 1), adding the obtained graphene adhesive solution into a stirring tank and activated carbon in batches for kneading and mixing, wherein the solid content of the first kneading and mixing is 60%, the kneading and stirring speed is 20rpm, and the kneading and stirring time is 20 min; after the first stirring is finished, adding the dispersion liquid of the rest graphene and the adhesive, wherein the whole solid content of the mixed sample is 50%, kneading and stirring at 20rpm for 120min, and the whole proportion of the activated carbon, the adhesive and the graphene is 92:7.5: 0.5;
3) and adding deionized water to stir and disperse after the step 2) is finished, wherein the whole solid content of the slurry is 43%, the stirring speed is 50r/min, the dispersing speed is 2000r/min, and the stirring and dispersing time is 60 min.
Then coating and rolling to obtain the super capacitor pole piece using the slurry, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
Example 3
1) Adding graphene into a dispersion solution of sodium carboxymethylcellulose (CMC), wherein the concentration of the graphene is 1%, and the ratio of the graphene to the CMC is 1: 5;
2) after the step 1), adding the obtained graphene adhesive solution into a stirring tank and activated carbon in batches for kneading and mixing, wherein the solid content of the first kneading and mixing is 48%, the kneading and stirring speed is 20rpm, and the kneading and stirring time is 20 min; after the first stirring is finished, adding the dispersion liquid of the rest graphene and the adhesive, wherein the whole solid content of the mixed sample is 38%, and kneading and stirring at 20rpm for 120min, wherein the whole proportion of the activated carbon, the adhesive and the graphene is 94:5: 1;
3) and adding deionized water to stir and disperse after the step 2) is finished, wherein the solid content of the whole slurry is 32%, the stirring speed is 50r/min, the dispersing speed is 2000r/min, and the stirring and dispersing time is 60 min.
And then coating and rolling to obtain the pole piece of the super capacitor using the slurry, testing the resistivity of the obtained pole piece, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
Example 4
1) Adding graphene into the dispersion liquid of SBR, wherein the concentration of the graphene is 1%, and the ratio of the graphene to the SBR is 1: 5;
2) after the step 1), adding the obtained graphene adhesive solution into a stirring tank and activated carbon in batches for kneading and mixing, wherein the solid content of the first kneading and mixing is 60%, the kneading and stirring speed is 20rpm, and the kneading and stirring time is 20 min; after the first stirring is finished, adding the dispersion liquid of the rest graphene and the adhesive, wherein the solid content of the whole mixed sample is
50 percent, kneading and stirring at 20rpm for 120min, wherein the integral proportion of the activated carbon, the adhesive and the graphene is 94:5: 1;
3) and (3) adding deionized water after the step 2) is finished, stirring and dispersing, wherein the solid content of the whole slurry is designed to be 40%, the stirring speed is 50r/min, the dispersing speed is 2000r/min, and the stirring and dispersing time is 60 min.
And then coating and rolling to obtain the pole piece of the super capacitor using the slurry, testing the resistivity of the obtained pole piece, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
Comparative example 1
Mixing activated carbon, a graphene conductive agent and a CMC adhesive according to a ratio of 94:5:1 proportion, and adding deionized water for dispersion, wherein the stirring speed is 50r/min, the dispersion speed is 2000r/min, the stirring dispersion time is 600min, the designed solid content of the slurry is 23%, the whole stirring dispersion process is carried out in vacuum, and the viscosity and the solid content are tested after the slurry is stirred.
And then coating and rolling to obtain the pole piece of the super capacitor using the slurry, testing the resistivity of the obtained pole piece, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
Comparative example 2
Mixing activated carbon, a graphene conductive agent and an SBR adhesive according to a ratio of 94:5:1 proportion, and adding deionized water for dispersion, wherein the stirring speed is 50r/min, the dispersion speed is 2000r/min, the stirring dispersion time is 600min, the designed solid content of the stirred material is 28%, the whole stirring dispersion process is carried out under vacuum, and the viscosity and the solid content are tested after the stirring of the slurry is finished.
And then coating and rolling to obtain the pole piece of the super capacitor using the slurry, testing the resistivity of the obtained pole piece, and then carrying out the procedures of stripping, winding, injecting liquid, sealing and the like to obtain the super capacitor using the slurry. The obtained capacitor is tested for the performance of capacity, direct current resistance and the like, wherein the test current density is 1A/g.
The activated carbon used in examples 1-6 was YP-50F, and the electrolyte used was a PC solvent system.
Table 1 shows the performance data of the slurry, the electrode sheet and the capacitor in each example, and it can be seen from the data that the graphene electrode slurry used in the present invention has higher slurry solid content and lower viscosity than the conventional process, and the prepared super capacitor has low direct current resistance, high energy density and power density.
Table 1.
Figure 705609DEST_PATH_IMAGE002
In view of the numerous embodiments of the present invention, the verified performance and the final conclusion of each embodiment are close to each other, and are not described herein. Meanwhile, the experimental parameters which are listed and not listed in the embodiment of the invention only represent an example of a technical scheme, namely a feasible scheme, and strict matching and limiting relations do not exist among the parameters, wherein the parameters can be replaced with each other without departing from the axiom and the requirement of the invention, except for special statement.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and the technical solutions of the embodiment are equally replaced by one or more technical parameters to form a new technical solution, which is also within the scope of the present invention; it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A preparation method of graphene supercapacitor slurry is characterized by comprising the following steps:
1) graphene adhesive dispersion liquid preparation
Adding graphene into a dispersion liquid of an adhesive for stirring and dispersing, wherein the mass ratio of the graphene to the adhesive is 1: 2-1: 20, the solid content of the graphene is 0.1% -10%, the stirring speed is 10-100 r/min, the dispersing speed is 800-3000 r/min, and the stirring and dispersing time is 30-600 min;
2) kneading and mixing the electrode active material and the graphene binder dispersion liquid step by step
Firstly, taking 20-70% of the total amount of the graphene adhesive dispersion liquid prepared in the step 1), adding an active electrode material into the adhesive graphene mixed liquid, and kneading, stirring and mixing in a first step, wherein the electrode active material comprises one or a mixture of more of active carbon, active carbon fiber and graphite, and the specific surface area of the active carbon material is more than 1500m2The solid content of kneading is 30-90%, the stirring speed is 5-100 r/min, and the kneading time is 10-180 min; then adding the rest graphene adhesive dispersion liquid prepared in the step 1) into the mixture obtained after the first-step kneading and stirring, and carrying out second-step kneading and stirring, wherein the solid content of the second-step kneading is 25-85%, and the whole material ratio is as follows: active materials are adhesive, namely graphene =70% -95%, 4.5% -20%, 0.5% -10%, the kneading and stirring speed is 5-100 r/min, and the kneading and stirring time is 30-600 min;
3) adding a solvent to dilute and disperse
After the step 2) is finished, adding a solvent into a stirring tank for dilution, stirring and dispersion, wherein the whole stirring and dispersion process is carried out in a vacuum environment, the solid content is 20% -80%, the stirring speed is 10-100 r/min, the dispersion speed is 500-3000 r/min, and the stirring and dispersion time is 10-600 min, so that the graphene supercapacitor slurry is prepared, wherein the viscosity range of the graphene supercapacitor slurry is 3000-8000 mPa.S.
2. The method for preparing graphene supercapacitor slurry according to claim 1, wherein the method comprises the following steps: the graphene in the step 1) is prepared by an oxidation-reduction method, a physical stripping method, a physical intercalation or a chemical intercalation, and the adhesive is one or more of polyvinylidene fluoride, polytetrafluoroethylene, styrene butadiene rubber, sodium carboxymethylcellulose and sodium alginate.
3. The method for preparing graphene supercapacitor slurry according to claim 1, wherein the method comprises the following steps: the graphene adhesive dispersion liquid in the step 1) has the concentration of 0.5-5% of graphene, and the ratio of graphene to adhesive is 1: 5-1: 15.
4. The method for preparing graphene supercapacitor slurry according to claim 1, wherein the method comprises the following steps: in the step 1), the stirring speed is 20-50 r/min, the dispersing speed is 1000-2000 rpm, and the stirring dispersing time is 60-300 min.
5. The method for preparing graphene supercapacitor slurry according to claim 1, wherein the method comprises the following steps: the solvent in the step 3) is one or a mixture of a plurality of solvents of water, ethanol and nitrogen methyl pyrrolidone.
6. The method for preparing graphene supercapacitor slurry according to claim 1, wherein the method comprises the following steps: in the step 3), the stirring speed is 20-50 rpm, the dispersing speed is 1000-2000 rpm, and the stirring dispersing time is 60-300 min.
7. A graphene supercapacitor made using the graphene supercapacitor slurry made by the method of claim 1, wherein: coating, rolling, slitting, winding and injecting the prepared graphene supercapacitor slurry to prepare a graphene supercapacitor, wherein a current collector used for coating is a carbon-coated aluminum foil, and an electrolyte solvent injected into the capacitor comprises one or more of ethylene carbonate, propylene carbonate, gamma-butyrolactone, dimethyl carbonate, diethyl carbonate, butylene carbonate, methyl ethyl carbonate and acetonitrile; solute in the electrolyte is at least one of sodium perchlorate, sodium hexafluorophosphate, sodium trifluoromethanesulfonate, sodium bis (trifluoromethanesulfonyl) imide, sodium bisoxalate, sodium hexafluoroarsenate, tetraethylene glycol dimethyl ether, tetraethylammonium tetrafluoroborate and spiro quaternary ammonium salt.
CN201910672382.5A 2019-07-24 2019-07-24 Preparation method and application of graphene supercapacitor slurry Active CN110491685B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910672382.5A CN110491685B (en) 2019-07-24 2019-07-24 Preparation method and application of graphene supercapacitor slurry

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910672382.5A CN110491685B (en) 2019-07-24 2019-07-24 Preparation method and application of graphene supercapacitor slurry

Publications (2)

Publication Number Publication Date
CN110491685A CN110491685A (en) 2019-11-22
CN110491685B true CN110491685B (en) 2021-10-01

Family

ID=68548122

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910672382.5A Active CN110491685B (en) 2019-07-24 2019-07-24 Preparation method and application of graphene supercapacitor slurry

Country Status (1)

Country Link
CN (1) CN110491685B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111799101A (en) * 2020-06-25 2020-10-20 常州卡本纳新材料科技有限公司 Preparation method of nano-carbon supercapacitor slurry

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2261934A1 (en) * 2008-02-29 2010-12-15 Sumitomo Chemical Company, Limited Ionic liquid-containing electrode membrane and electrode, process for producing the electrode membrane and the electrode, and electric storage device
CN104332595A (en) * 2014-10-17 2015-02-04 深圳市山木电池科技有限公司 Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery
CN105261490A (en) * 2015-09-16 2016-01-20 宁波南车新能源科技有限公司 Preparation method of battery-capacitor electrode slurry
CN106207129A (en) * 2016-08-31 2016-12-07 中航锂电（洛阳）有限公司 A kind of preparation method of anode slurry of high-rate

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2261934A1 (en) * 2008-02-29 2010-12-15 Sumitomo Chemical Company, Limited Ionic liquid-containing electrode membrane and electrode, process for producing the electrode membrane and the electrode, and electric storage device
CN104332595A (en) * 2014-10-17 2015-02-04 深圳市山木电池科技有限公司 Positive slurry of lithium ion battery as well as preparation method and application of positive slurry of lithium ion battery
CN105261490A (en) * 2015-09-16 2016-01-20 宁波南车新能源科技有限公司 Preparation method of battery-capacitor electrode slurry
CN106207129A (en) * 2016-08-31 2016-12-07 中航锂电（洛阳）有限公司 A kind of preparation method of anode slurry of high-rate

Also Published As

Publication number Publication date
CN110491685A (en) 2019-11-22

Similar Documents

Publication Publication Date Title
CN106047015B (en) Conductive coating material of lithium ion battery, preparation method of conductive coating material and lithium ion battery
CN104085877B (en) A kind of based on Chitosan-phospholipid complex porous carbon electrode material and its production and use
CN110015660B (en) Silver-doped lignin porous carbon nanosheet, preparation method thereof and application thereof in supercapacitor electrode material
CN102751101B (en) A kind of platinum/graphene nano matrix material and its preparation method and application
CN106654204A (en) Preparation method for graphene conductive slurry
US20230018612A1 (en) Cobalt-free system, positive electrode slurry, slurry homogenization method therefor, and use thereof
CN104362001B (en) Method for preparing manganese dioxide/graphene/porous carbon (MnO2/rGO/C) composite material and application of MnO2/rGO/C composite material to supercapacitor as electrode material
CN102832050B (en) Method for preparing graphene/carbon nanotube hybrid in hierarchical structure
CN103199258A (en) Cathode material of lithium ion battery, preparation method of cathode, and lithium ion battery
CN104934603A (en) Preparation method of graphene-dopedand carbon-coated modified graphite anode material
CN110459410A (en) A kind of preparation method of super capacitor slurry and its supercapacitor prepared using super capacitor slurry
CN108808077B (en) Preparation method of multifunctional gel polymer electrolyte with gradient barium titanate content
CN103632857A (en) Preparation method for nickel-oxide/ reduced-graphene-oxide nanosheet composite materials
CN104681306A (en) Preparation method for mixed capacitor cathode pulp
CN111883366A (en) Polypyrrole nanosphere @ titanium carbide composite material and preparation method and application thereof
CN104681300A (en) Polyaniline-sulfonated graphene composite electrode material and preparation method thereof
CN112582612A (en) Lithium ion battery anode slurry and preparation method thereof
CN108511692A (en) A kind of lithium ion cell electrode and preparation method thereof
CN110491685B (en) Preparation method and application of graphene supercapacitor slurry
Xu et al. From hydroxyl group to carbonyl group: Tuning the supercapacitive performance of holey graphene
CN111799101A (en) Preparation method of nano-carbon supercapacitor slurry
CN112713265A (en) Composite conductive binder suitable for silicon-based negative electrode, preparation method and application
CN109326452A (en) A kind of preparation method and application of polypyrrole/polyaniline double-walled nanotubes electrode
CN110690423B (en) Heteroatom doped carbon material and preparation method and application thereof
CN113658743A (en) Carbon dot composite conductive agent and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant