A preparation method of graphene/activated carbon composite material, graphene/activated carbon composite electrode sheet and supercapacitor
A composite material and composite electrode technology, which is applied in the manufacture of hybrid/electric double layer capacitors and hybrid capacitor electrodes, can solve problems such as inducing side reactions, lowering device performance, and reducing electrode density, so as to increase volumetric energy density and improve The effect of withstand voltage and increase the electrode density
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0037] The specific surface area is 1800-2000m 2 / g, activated carbon with a particle size of 7-10 μm is uniformly dispersed in 15% nitric acid solution, refluxed at 80°C for 1.5 hours, then filtered, washed, and dried to obtain acid-treated activated carbon.
[0038] Prepare a mixed solution of 1mg / mL graphene oxide, ethanol and water, the single-layer ratio of graphene oxide is >95%, the sheet size is 7-10μm, the oxygen content is 50%, and the volume ratio of ethanol and water is 5:5. Add polydimethylacrylamide (PEI) accounting for 7% of the mass fraction of graphene oxide to the above solution, and stir and react at room temperature for 2 hours to obtain a covalently modified graphene oxide PEI colloidal solution.
[0039] The modified graphene oxide colloidal solution and acidified activated carbon are uniformly mixed according to the solid mass ratio of 10%:90%, ultrasonically dispersed for 2 hours, and a slurry of graphene oxide-coated activated carbon composite material...
Embodiment 2
[0042] The specific surface area is 1800-2000m 2 Activated carbon with a particle size of 7-10 μm is uniformly dispersed in 20% nitric acid solution, refluxed at 70°C for 1 hour, filtered, washed, and dried to obtain acid-treated activated carbon.
[0043] Configure the mixed solution of 1mg / mL graphene oxide, ethanol and water, the monolayer rate of described graphene oxide>95%, sheet size 7-10 μ m, oxygen content 50%, the volume ratio of ethanol and water is 4: 6. Add 5% polydimethylacrylamide (PEI) that accounts for graphene oxide mass fraction in above-mentioned solution, stir and react at room temperature for 2 hours to obtain the covalently modified colloidal solution of graphene oxide PEI;
[0044] The modified graphene oxide colloidal solution and acidified activated carbon are uniformly mixed according to the solid mass ratio of 15%: 85%, ultrasonically dispersed for 2 hours, and a slurry of graphene oxide-coated activated carbon composite material is formed under el...
Embodiment 3
[0047] The specific surface area is 1800-2000m 2 / g, activated carbon with a particle size of 7-10 μm is uniformly dispersed in 25% sulfuric acid solution, refluxed at 60 for 2 hours, then filtered, washed and dried to obtain acid-treated activated carbon.
[0048] A mixed solution of 1 mg / mL graphene oxide dissolved in water is prepared, the graphene oxide monolayer ratio is >95%, the sheet size is 7-10 μm, and the oxygen content is 50%. Added polydiallyldimethylamine hydrochloride (PDDA) accounting for 6% of the mass fraction of graphene oxide to the above solution, stirred and reacted at room temperature for 2 hours to obtain a covalently modified colloidal solution of graphene oxide PDDA.
[0049] The modified graphene oxide colloidal solution and the activated carbon after acidification are uniformly mixed according to the solid mass ratio of 5%: 95%, ultrasonically dispersed for 2 hours, and the slurry of the graphene oxide-coated activated carbon composite material is f...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| electrical conductivity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More