Method for preparing super capacitor
A technology for supercapacitors and electrode sheets, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors, etc. It can solve the problems of wasting energy and high product prices, and achieve the effects of low price, high specific capacitance and simple preparation process
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Embodiment 1
[0028] 30 g of commercial sodium alginate was placed in a tube furnace, and the temperature was raised to 800 °C at a rate of 2 °C / min under a nitrogen protective atmosphere. After holding for 2 h, the temperature was naturally cooled to room temperature to obtain sodium alginate-based porous carbon. By scanning electron microscopy (see figure 1 ) and transmission electron microscopy (see figure 2 ) observed that sodium alginate-based porous carbon has a hierarchical pore structure, that is, it has a micropore-mesopore-macropore structure. N of alginate-based porous carbon 2 Adsorption-desorption curves and pore size distribution diagrams (see image 3 and Figure 4 ) shows that its specific surface area is 1919 m 2 / g;
[0029] Then the sodium alginate-based porous carbon obtained in the above steps was mixed with Carbot V XC -72, 10% PTFE (polytetrafluoroethylene) emulsion was mixed at a mass ratio of 8:1:1, and then absolute ethanol was added dropwise to the mixed so...
Embodiment 2
[0032] The process of this example is the same as that of Example 1, except that the heating rate in step 1 is changed from 2°C / min to 8°C / min, the temperature rises from 800°C to 720°C, and the heat preservation time is changed from 2 hours to 1 hour , the final specific surface area of sodium alginate-based porous carbon is 2063 m 2 / g; the resulting supercapacitor has a specific capacitance of 241 F / g at a current density of 0.05 A / g; and a specific capacitance of 175.2 F / g at a current density of 40 A / g. At a current density of 40 A / g, the capacity retention of the supercapacitor is as high as 99.3% after 5000 cycles.
Embodiment 3
[0034] 27 g of commercial potassium alginate was placed in a tube furnace, and the temperature was raised to 850 °C at a rate of 5 °C / min under a nitrogen protective atmosphere. After 4 h of heat preservation, the temperature was naturally cooled to room temperature to obtain potassium alginate-based porous carbon. The specific surface area of sodium alginate-based porous carbon is 1973 m 2 / g;
[0035] Then the potassium alginate-based porous carbon obtained in the above steps was mixed with Carbot V XC -72, 10% PTFE (polytetrafluoroethylene) emulsion was mixed at a mass ratio of 8:1:1, and then absolute ethanol was added dropwise to the mixed solution and ultrasonically oscillated for 1 h to make it into a slurry. Finally, the slurry was molded on a film laminator to prepare a uniform carbon film with a thickness of 60 μm. The carbon film was punched into a film with a diameter of 13 mm by a punching machine again, and then pressed into a circular electrode sheet with a ...
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