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A kind of preparation method of special activated carbon for water-based supercapacitor

A supercapacitor and activated carbon technology, which is applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problems of water system supercapacitor specific capacity loss, can not meet the high rate of water system supercapacitor, etc., to achieve performance improvement, fast conversion, performance noticeable effect

Active Publication Date: 2018-01-30
YIYANG WANJINGYUAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, in the aqueous electrolyte, the diameter of K+ ions corresponds to the microporous structure of activated carbon (1-4nm), which is an order of magnitude smaller than the diameter of organic salt ions. However, the activated carbon materials currently available on the market are all designed for organic electrolytes. It has a homogeneous structure, mainly mesopores (5-100nm), and is more suitable for the environment of organic electrolytes, but it is easy to cause serious loss of specific capacity in the assembled water-based supercapacitor, so it cannot meet the requirements of high rate and high performance of water-based supercapacitors. Specific capacity requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The three-year-old bamboo is washed and crushed to a particle size of 100-200 meshes, dried, and then carbonized in a carbonization furnace at 500°C for 40-60 minutes, and cooled to room temperature in an inert gas. Then the obtained activated carbon was crushed to less than 100 μm to obtain bamboo-based activated carbon.

[0015] Crushing the petroleum coke to less than 100 μm, mixing the bamboo-based activated carbon obtained in step (1) with petroleum coke, potassium hydroxide and polyethylene glycol, wherein the mass parts added by each raw material are: 80 parts of petroleum coke, 18 parts of carbonized bamboo 2 parts, 2 parts of polyethylene glycol, 160 parts of potassium hydroxide, under the protection of inert gas, gradually raise the temperature of the carbon-alkali mixture to 750 ℃ ​​at a rate of 20 ℃ / min, and activate it for 1 hour. Cool to room temperature under the protection of inert gas. Wash with water until neutral, and dry at 100°C for 15 hours to obt...

Embodiment 2

[0018] The three-year-old bamboo is washed and crushed to a particle size of 100-200 meshes, dried, and then carbonized in a carbonization furnace at 500°C for 40-60 minutes. Cool to room temperature under inert gas. Then the obtained activated carbon was crushed to less than 100 μm to obtain bamboo-based activated carbon.

[0019] Petroleum coke is crushed to less than 100 μm, the bamboo-based activated carbon obtained in step (1) is mixed with petroleum coke, potassium hydroxide, polyethylene glycol, wherein the mass parts added by each raw material are: 75 parts of petroleum coke, 24 parts of carbonized bamboo 1 part, 1 part of polyethylene glycol, 450 parts of potassium hydroxide, under the protection of an inert gas, the carbon-alkaline mixture was gradually heated to 750 ℃ ​​at a rate of 20 ℃ / min, and activated for 1.5 hours. Cool to room temperature under the protection of inert gas. Wash with water until neutral, and dry at 100°C for 15 hours to obtain activated carb...

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Abstract

The invention discloses a method for preparing activated carbon special for water-based supercapacitors. Bamboo is pre-oxidized and carbonized to obtain a carbon precursor, which is mixed with petroleum coke, potassium hydroxide and polyethylene glycol. The mass parts added by each raw material are: 75-80 parts of petroleum coke, 15-25 parts of carbonized bamboo, 1-2 parts of polyethylene glycol, and 80-480 parts of potassium hydroxide. The mixture was gradually heated to 700-800°C at a rate of 20°C / min, activated for 1-1.5 hours, cooled to room temperature under the protection of an inert gas, washed with water until neutral, and dried in a drying oven at 100°C for 15 hours. The activated carbon obtained by this method has high microporosity, and at the same time has the rich mesopore system of bamboo-based activated carbon as an ion transport channel, which improves the specific capacity and rate of the supercapacitor. The water-based supercapacitor based on the activated carbon material has both high specific capacity and high rate capability.

Description

technical field [0001] The invention relates to the technical field of capacitor material preparation, in particular to a method for preparing activated carbon special for water-based supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device developed in the late 20th century. Compared with traditional secondary batteries such as lithium-ion batteries and lead-acid batteries, it has the advantages of large specific capacity, high power density, long cycle life, and environmental protection. In recent years, with the investment of countries in the world in renewable energy and green environmental protection industries, as well as the rapid development of power station grid energy regulation, green public transportation, smart meters and other fields, the advantages of supercapacitors have become prominent, and it has become a hot spot in the research and development of the international energy field. [0003] Supercapacitors generall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348H01G11/34
CPCY02E60/13
Inventor 杨畅蔡锦丰詹慧文
Owner YIYANG WANJINGYUAN ELECTRONICS