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Spherical super-capacitor activated carbon, and preparation method and application thereof

A spherical, carbon-capacitating technology, applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve problems such as difficult to meet the requirements of supercapacitors, dendrite crystallization, short circuit of supercapacitors, etc.

Inactive Publication Date: 2020-01-24
SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing resin-based activated carbons often have poor performance in the above aspects, and it is difficult to meet the requirements of supercapacitors, resulting in relatively limited applications.
[0003] In addition, the supercapacitor carbon product obtained by the existing preparation method has a relatively high content of metals, especially alkali metals, attached to the surface and inside of the pores, which is prone to dendrites caused by the reduction and precipitation of metals, resulting in a short circuit in the supercapacitor and other failures, complex cleaning processes are required to reduce the content of such alkali metals
Moreover, the method of testing the content of alkali metals is more complicated

Method used

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  • Spherical super-capacitor activated carbon, and preparation method and application thereof
  • Spherical super-capacitor activated carbon, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0090] The preparation of preparation example 1 spherical polymer matrix

[0091]Add 20 liters of water into a 50-liter polymerization kettle, heat it to 30°C, add 12g of magnesium carbonate, 24g of gelatin and 0.18g of methylene blue under stirring, and add 3.5kg of methyl styrene, 1.2kg of The oil phase that dipentene and 24g benzoyl peroxide are mixed, add 1.2kg paraffin again, seal polymerization kettle, pass into clean compressed air in the polymerization kettle, keep the gas phase pressure in the kettle to be 0.05MPa. Then, start stirring, adjust the liquid beads in the kettle to an appropriate particle size, raise the temperature to 90°C, keep the temperature for 12 hours, then raise the temperature to 110°C, keep the temperature for 20 hours, filter, wash, dry and sieve to obtain the white spherical polymer 2.6 kg, after testing, the BET of the product is 10.577m 2 / g.

Embodiment 1

[0093] 1.1 Carbonization

[0094] 220g median particle size D 50 Put the above-mentioned white spherical polymer into a rotary tube furnace with a thickness of 0.8mm, and carry out the following heat treatment at a heating rate of 5°C / min under a nitrogen atmosphere:

[0095] Heat to 100°C and stay for 100 minutes;

[0096] Heat to 150°C and stay for 200 minutes;

[0097] Carry out the following heat treatment at a heating rate of 6°C / min:

[0098] Heat to 300°C and stay for 100 minutes;

[0099] Heat to 500°C and stay for 200 minutes;

[0100] It was then heated to 650°C and held for 100 minutes. The temperature was lowered to obtain 200 g of carbonized product.

[0101] 1.2 Preactivation and activation

[0102] In a rotary tube furnace, under a mixed atmosphere of water vapor, carbon dioxide and nitrogen at a flow rate ratio of 1:1:4.5 (L / min), heat the carbonized product obtained in step 1.1 to 950 °C at a rate of 4 °C / min , stay for 360min, then heat to 1000℃ at a ...

Embodiment 2

[0104] 2.1 Sulfonation and carbonization

[0105] The median diameter D obtained by the preparation example 1 that the mass ratio is 1:1.5 50 0.8mm above-mentioned white ball polymer (200g) and SO 3 Mix, then put the mixture into an acid-resistant rotary tube furnace, and perform the following heat treatment at a heating rate of 4°C / min under a helium atmosphere:

[0106] Heat to 80°C and stay for 60 minutes;

[0107] Heat to 150°C and stay for 300 minutes;

[0108] With a heating rate of 3°C / min, in a mixed atmosphere with an oxygen volume percentage of 5%, the following heat treatment is carried out:

[0109] Heat to 200°C and stay for 90 minutes;

[0110] Heat to 500°C and stay for 320 minutes;

[0111] It was then heated to 600°C and held for 120 minutes. The temperature was lowered to obtain 156 g of carbonized product.

[0112] 2.2 Preactivation and activation

[0113] In a rotary tube furnace, under a mixed atmosphere of water vapor and nitrogen with a volume ra...

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Abstract

The invention belongs to the technical field of electrode material preparation, and in particular relates to spherical super-capacitor activated carbon, and a preparation method and application thereof. The specific surface area B of the spherical super-capacitor activated carbon is 1500-4000 m<2> / g. The invention also provides the preparation method of the spherical super-capacitor activated carbon. The preparation method comprises the following steps: 1) carbonizing a spherical polymer; 2) pre-activating the product obtained in the step 1); and 3) mixing the product obtained by pre-activation in the step 2) with an alkaline compound, and carrying out activation. According to the preparation method provided by the invention, the super-capacitor activated carbon can be prepared at good yield and low cost, and the obtained activated carbon has a good spherical profile and a low metal content, so that the prepared spherical activated carbon can be used as an electrode material of super-capacitors.

Description

technical field [0001] The invention belongs to the technical field of electrode materials and preparation methods thereof, and in particular relates to spherical supercapacitive carbon, its preparation method and application. Background technique [0002] Supercapacitor is a passive device that has been mass-produced in recent years. It is between batteries and ordinary capacitors. It has the characteristics of large current and fast charge and discharge of capacitors, and also has the characteristics of energy storage of batteries. It uses electrons moving between conductors (rather than relying on chemical reactions) to discharge an electric current to provide power to the device. Supercapacitors have extremely long working life and fast charging and discharging characteristics, and are also used in a wide range of fields such as electric vehicles, hybrid vehicles, electric tools, electric toys, railway systems, and power systems. Activated carbon has broad non-specific ...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/342C01B32/336H01G11/24H01G11/42
CPCC01B32/348C01B32/342C01B32/336H01G11/24H01G11/42Y02E60/13
Inventor 常明珠
Owner SHENZHEN GLOBAL GREENLAND NEW MATERIALS CO LTD
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