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A kind of preparation method of nano-spherical carbon airgel
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A carbon aerogel and aerogel technology are applied in the preparation/purification of carbon, the manufacture of hybrid/electric double-layer capacitors, electrodes of hybrid capacitors, etc. The effect of fast reaction speed and simple operation process
Active Publication Date: 2020-04-21
NINGBO CRRC NEW ENERGY TECH CO LTD
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However, the formaldehyde and resorcinol used are highly toxic, resulting in the need for special protection in production, not only high production costs, but also harmful to the human body
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Embodiment 1
[0036] (1) Ammonia solution with a pH value of 10 is mixed with alginic acid to form a mixed solution, wherein alginic acid accounts for 5% of the total mass of the mixed solution, and then the mixed solution is added to the acetone under stirring at a volume ratio of 1:25, And keep stirring for 4 hours, centrifuge and dry under normal pressure at 80°C to obtain nano-spherical alginic acid-based carbon airgel;
[0037] (2) Place the nano-spherical alginic acid-based carbon aerogel in a tube furnace, and under the protection of nitrogen, heat up to 700 °C at a rate of 3 °C / min, keep it warm for 3 hours, and then cool to room temperature to obtain carbonized nano-spherical Alginate-based carbon aerogel;
[0038] (3) Mix the carbonized nano-spherical alginate-based carbon aerogel with KOH at a mass ratio of 1:4, put it back in the tube furnace, and raise the temperature to 800 °C at a rate of 4 °C / min under the protection of nitrogen. Insulated for 2 hours, then cooled to room t...
Embodiment 2
[0041] (1) Mix ethylenediamine solution with a pH value of 9 and alginic acid to form a mixed solution, wherein alginic acid accounts for 10% of the total mass of the mixed solution, and then add the mixed solution to ethanol under stirring at a volume ratio of 1:70 , and continuously stirred for 6 hours, centrifuged and dried under normal pressure at 80°C to obtain nano-spherical alginic acid-based carbon airgel;
[0042] (2) Place the nano-spherical alginic acid-based carbon airgel in a tube furnace, and under the protection of nitrogen, heat up to 850 °C at a rate of 4 °C / min, keep it warm for 4 hours, and then cool to room temperature to obtain carbonized nano-spherical Alginate-based carbon aerogel;
[0043] (3) Mix the carbonized nano-spherical alginate-based carbon aerogel with KOH at a mass ratio of 1:3, put it back in the tube furnace, and raise the temperature to 920 °C at a rate of 3 °C / min under the protection of nitrogen. Insulated for 3 hours, and then cooled to...
Embodiment 3
[0046] (1) Mix ethylenediamine solution with a pH value of 8 and alginic acid to form a mixed solution, wherein alginic acid accounts for 7% of the total mass of the mixed solution, and then add the mixed solution to ethanol under stirring at a volume ratio of 1:45 , and continuously stirred for 7 hours, centrifuged and dried under normal pressure at 80°C to obtain nano-spherical alginic acid-based carbon airgel;
[0047] (2) Place the nano-spherical alginic acid-based carbon airgel in a tube furnace, and under the protection of nitrogen, heat up to 640 °C at a rate of 3 °C / min, keep it warm for 4 hours, and then cool to room temperature to obtain carbonized nano-spherical Alginate-based carbon aerogel;
[0048] (3) Mix the carbonized nano-spherical alginate-based carbon airgel with KOH at a mass ratio of 1:5, put it back in the tube furnace, and raise the temperature to 750 °C at a rate of 4 °C / min under the protection of nitrogen. Insulated for 2 hours, then cooled to room ...
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Abstract
The invention relates to a preparation method for a nano spherical carbon aerogel, and belongs to the technical field of super capacitors. The preparation method comprises the following steps: mixingan alkaline liquid and alginic acid to form a mixed solution, wherein the alginic acid accounts for 2-10% of the total mass of the mixed solution, adding the mixed solution into acetone or ethanol, performing stirring continuously, performing centrifugation, and performing drying to obtain a nano spherical alginic acid-based carbon aerogel; placing the nano spherical alginic acid-based carbon aerogel into a tube furnace, under the protection of a nitrogen gas, raising the temperature to 500-900 DEG C, performing heat preservation, and performing cooling to room temperature, so as to obtain ancarbonized nano spherical alginic acid-based carbon aerogel; and mixing the carbonized nano spherical alginic acid-based carbon aerogel and KOH, placing the mixed material into a tube furnace, raisingthe temperature to 700-1000 DEG C under the protection of a nitrogen gas, performing heat preservation, and performing cooling to room temperature, so as to obtain the activated nano spherical alginic acid-based carbon aerogel. The activated nano spherical carbon aerogel prepared by the method provided by the invention has a high specific surface area and nano hierarchical structure pores; and the activated nano spherical carbon aerogel is used to prepare a super capacitor, and the prepared super capacitor has characteristics of high specific energy, high power and the like.
Description
technical field [0001] The invention relates to a preparation method of nano-spherical carbon aerogel, in particular to a preparation method of nano-spherical carbon aerogel and the preparation of a high-specific-energy high-power supercapacitor by using the nano-spherical carbon aerogel, which belongs to supercapacitors technology field. Background technique [0002] The electrode materials of supercapacitors are mainly composed of porous carbon materials, including activated carbon, carbon nanotubes, graphene, and carbon aerogels. Since carbon aerogel is a new type of carbon material with a continuous nanoporous structure, it has received extensive attention due to its high specific surface area, high porosity, good electrical conductivity, low thermal conductivity, and controllable pore size. However, so far, nano-spherical carbon aerogels are mainly obtained by first preparing organic aerogels (OA) through formaldehyde and resorcinol sol-gel, and then drying the organic...
Claims
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