Modified activated carbon material, preparation method and supercapacitor application thereof
An activated carbon and modified technology, which is applied in the fields of hybrid capacitor electrodes, chemical instruments and methods, carbon compounds, etc., can solve the problems of increasing the proportion of inactive components in the device, poor conductivity, and complex processes, and achieve easy large-scale industrialization. Production, stable material properties, and the effect of improving preparation efficiency
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Embodiment 1
[0027] A commercial activated carbon S1 was put into a ball mill and ball milled at a constant speed of 500 rpm for 12 hours under an argon atmosphere to obtain a high-density activated carbon material (S1-12).
[0028] as attached figure 1 As shown in the particle size distribution diagram, the average particle size decreased from 16.9 μm to 11.5 μm after ball milling; the tap density of activated carbon was measured from 0.37 g cm -3 Increased to 0.73g cm -3 , increased by 97%; nitrogen adsorption and desorption test results show that the specific surface area and pore volume by 1673m 2 g -1 and 0.8cm 3 g -1 Lowered to 302m 2 g -1 and 0.3cm 3 g -1 . Blind hole rate decreased from 15.6% to 3.7%. Conductivity by 57S m -1 Increased to 138S m -1 .
[0029] as attached figure 2 The electrochemical performance test results of supercapacitors show that at 1A g -1 Under the current density, the mass specific capacity and volume specific capacity of S1 are 179F g -1 an...
Embodiment 2
[0032] A commercial activated carbon S2 was put into a ball mill and ball milled at a constant speed of 500 rpm for 8 hours under a nitrogen atmosphere to obtain a high-density activated carbon material (S2-8).
[0033] The measured tap density is from 0.41g cm -3 Increased to 0.81g cm -3 , an improvement of 98%. , the specific surface area is 1294m 2 g -1 Reduced to 582m 2 g -1 . Blind hole rate decreased from 18.9% to 4.2%. Conductivity by 87S m -1 Increased to 164S m -1 . Electrochemical test results showed that at 1A g -1 Under the current density, the mass specific capacity of S2-8 is increased by 12% compared with S2, and the volume specific capacity is increased by 238%; at 10A g -1 Under the current density, the volume specific capacity is increased by 204%.
[0034] The self-discharge test results of supercapacitors show that the initial voltage is 3.5V. In the open circuit state, the time for the voltage of S2 and S2-8 to decrease to half of the initial v...
Embodiment 3
[0036] A commercial activated carbon S2 was put into a pulverizer and pulverized at a constant speed of 2800 rpm for 16 hours under a vacuum atmosphere to obtain a high-density activated carbon material (S2-16).
[0037] The measured tap density of S2-16 is 1.02g cm -3 , the specific surface area is 822m 2 g -1 . The blind hole rate is 3.2%. Conductivity by 57S m -1 Increased to 280S m -1 . Electrochemical test results showed that at 1A g -1 Under the current density, the mass specific capacity of S2-16 is increased by 15% compared with S2, and the volume specific capacity is increased by 248%; at 10A g -1 Under the current density, the volume specific capacity is increased by 243%. The self-discharge test results show that the time for the voltage of S2-16 to decrease to half of the initial voltage is 13 hours, which is 140% longer; after standing for 48 hours, the voltage decays to 1.44V, which is 20% lower.
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