A kind of preparation method of supercapacitor and supercapacitor
A supercapacitor and electrode technology, which is applied in the field of capacitance, can solve the problems of failing to give full play to the advantages of graphene, and achieve the effects of improving conductivity, easy operation, and low cost
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[0022] Such as figure 1 As shown, it is a flowchart of a supercapacitor preparation method according to an embodiment of the present invention, and the supercapacitor preparation method includes:
[0023] 101. Preparation of graphene: use graphene oxide to prepare reduced graphene: prepare graphene oxide by Hummers method, and then reduce graphene oxide by heat treatment to generate reduced graphene rGO;
[0024] 102. Preparation of carbon nanohorns: rapid condensation of carbon atoms of reduced graphene rGO under catalyst-free conditions to obtain carbon nanohorn aggregates;
[0025] 103. Electrode preparation: Electrode preparation includes slurry preparation and coating, specifically including: mixing reduced graphene with carbon nanohorns to prepare slurry, the ratio of the mass of carbon nanohorns to the mass of multilayer graphene sheets in the electrode Between about 0.25 and about 0.5, then add the binder; coat the prepared slurry with aluminum foil, and dry to obtain...
example 1
[0050] 50mg of carbon nanohorns and 50mg of reduced graphene were dispersed in 50mL of deionized water to obtain a uniform solution. Suction filter to get 2cm 2 carbon nanohorn and reduced graphene hybrid films. The film was transferred to an aluminum foil current collector to obtain an electrode for supercapacitor assembly. image 3 It is a schematic diagram and a TEM (Transmission electron microscope, transmission electron microscope) and SEM (Scanning Electron Microscope, scanning electron microscope) diagram of the structure of the electrode according to the first aspect of the embodiment of the present invention; Figure 4 is in image 3 Schematic diagram of the structure of carbon nanohorn aggregates used in the electrodes shown. image 3 A composite structure of carbon nanohorns and reduced graphene is shown. It is proved that the carbon nanohorns are uniformly dispersed on the graphene sheet. These carbon nanohorns can act as scaffolds to inhibit the aggregation o...
example 2
[0055] 5mg of multi-walled carbon nanotubes (or single-walled carbon nanotubes or metal nickel nanoparticles) and 95mg of reduced graphene were dispersed in 50mL of deionized water to obtain a uniform solution. Suction filter to get 2cm 2 carbon nanohorn and reduced graphene hybrid films. The film was transferred to an aluminum foil current collector to obtain an electrode for supercapacitor assembly. Figure 6 It is a series of different electrode materials in the supercapacitor or current collector of the embodiment of the present invention, and their resistivity is a graph of the function of voltage; the cyclic voltammogram and the capacitance value of the supercapacitor obtained by the embodiment of the present invention in Fig. 7 Diagrams of graphene electrodes with different heat treatment times; Figure 7 The resistivity of these materials as a function of voltage is shown. Line 1 corresponds to the addition of only rGO without other electrode materials. Line 2 corr...
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