Supercapacitor spherical active carbon preparation method
A spherical activated carbon and supercapacitor technology, which is applied in the preparation of supercapacitor electrode materials and the preparation of starch-based high specific surface area spherical activated carbon, can solve the problems of low starch carbonization rate and achieve easy operation, simple production process and good rate performance Effect
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Embodiment 1
[0024] Step 1: Mix potato starch with a particle size of 100 microns, such as potato starch, and ammonium dihydrogen phosphate at a solid mass ratio of 8:1, dissolve in an appropriate amount of distilled water, and prepare a starch solution with a mass percentage concentration of 10%. Spray drying to obtain a dry starch mixture, which includes starch and catalyst ammonium dihydrogen phosphate;
[0025] Step 2: Put the spray-dried starch mixture in a tube-type resistance furnace, raise the temperature to 150-240°C under an inert atmosphere of nitrogen or argon for 4-6 hours of stabilization treatment, and obtain a starch-based product with a primary pore structure. carbon microspheres;
[0026] Step 3: Mix starch-based carbon microspheres with saturated KOH solution at a mass ratio (starch: KOH) of 1:3, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~800°C under an inert atmosphere. The activation time is 1~8h, and it is tak...
Embodiment 2
[0029] Step 1: Mix bean starch with a particle size of 100 microns, such as pea starch, with ammonium hydrogen phosphate at a solid mass ratio of 5:1, dissolve in an appropriate amount of distilled water, and make a starch solution with a mass percentage concentration of 5%, and spray it Dry to obtain a dry starch mixture, which includes starch and catalyst ammonium hydrogen phosphate;
[0030] Step 2: Put the spray-dried starch mixture in a tubular resistance furnace, heat up to 200-300°C in an inert atmosphere for stabilization treatment for 4-10 hours, and obtain starch-based carbon microspheres with primary pore structure;
[0031] Step 3: Mix starch-based carbon microspheres with saturated NaOH solution at a mass ratio (starch: NaOH) of 1:10, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~800°C under an inert atmosphere. The activation time is 1~8h, and it is taken out after cooling, and the activated product obtained ...
Embodiment 3
[0034]Step 1: mix fruit starch with a particle size of 100 microns, such as chestnut starch and phosphoric acid at a solid mass ratio of 10:1, dissolve in an appropriate amount of distilled water, and make a starch solution with a concentration of 30% by mass percentage, and mix the starch solution with Spray drying to obtain a dry starch mixture, which includes chestnut starch and phosphoric acid;
[0035] Step 2: Put the spray-dried starch mixture in a tubular resistance furnace, heat up to 300-500°C under an inert atmosphere for stabilization treatment for 4-6 hours, and obtain starch-based carbon microspheres with a primary pore structure;
[0036] Step 3: Mix starch-based carbon microspheres and KOH saturated easily according to the mass ratio (starch: KOH) of 1:4, dry the water and place it in a resistance furnace for activation. The activation temperature is 500~900°C under an inert atmosphere. The activation time is 1~8h, and it is taken out after cooling, and the acti...
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