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Surface modification method of carbon cloth for supercapacitor electrodes

A supercapacitor and surface modification technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of reduced comprehensive properties of materials, poor oxidation effect, and damage to the fiber body, so as to achieve low cost and improve activity. and roughness, time-consuming effect

Active Publication Date: 2016-08-17
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods often have cumbersome treatment process, high cost, and easy damage to the fiber body, resulting in uneven oxidation and poor oxidation effect, which reduces the overall performance of the material.

Method used

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  • Surface modification method of carbon cloth for supercapacitor electrodes
  • Surface modification method of carbon cloth for supercapacitor electrodes
  • Surface modification method of carbon cloth for supercapacitor electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 4g of LiNO 3 , was dissolved in 10 mL of distilled water to form a homogeneous solution, and the carbon cloth was impregnated in LiNO 3 Once in the solution, take it out and place it in an 80°C drying oven to dry and recrystallize for 24h, then wash it, put it in a tube furnace, and set it in an Ar atmosphere at 5°C·min -1 The heating rate was increased to 750°C, and the temperature was kept constant for 120 minutes. After cooling, it was washed with distilled water to remove inorganic salts, and then dried to obtain a surface-modified carbon cloth.

[0025] The scanning electron micrograph of the carbon cloth prepared in this embodiment is as follows: figure 1 As shown, the scanning electron micrographs of the unmodified carbon cloth are as follows figure 2 As shown, it can be seen that the surface of the unmodified carbon cloth is smooth, and the surface of the modified carbon cloth is rough. Supercapacitor test was carried out on the prepared modified carbo...

Embodiment 2

[0027] Weigh 4g of Li 2 SO 4 , was dissolved in 10 mL of distilled water to form a homogeneous solution, and the carbon cloth was impregnated in Li 2 SO 4 solution twice, take it out and put it in an 80°C drying oven to dry and recrystallize for 24 hours, then wash it, put it in a tube furnace, and set it in an Ar atmosphere at 5°C·min -1 The heating rate was raised to 750°C, and the temperature was kept constant for 120 minutes. After cooling, it was washed with distilled water to remove inorganic salts, and then dried to obtain a surface-modified carbon cloth. At a discharge current density of 1mA, the specific capacitance was 180mF·cm -2 , the capacitance remains at 150mF·cm at 20mA -2 .

Embodiment 3

[0029] Weigh 4g of Na 2 S 2 o 3 , dissolved in 10 mL of distilled water to form a uniform solution, impregnated the carbon cloth in Na 2 S 2 o 3 solution once, put it in an 80°C drying oven to dry and recrystallize for 24h, then wash it, put it in a tube furnace, under Ar atmosphere, at 5°C·min -1 The heating rate was increased to 750°C, and the temperature was kept constant for 120 minutes. After cooling, it was washed with distilled water to remove inorganic salts, and dried to obtain a surface-modified carbon cloth with a specific capacity of 200mF·cm at a discharge current density of 1mA. -2 , the capacitance remains at 160mF·cm at 20mA -2 .

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Abstract

The invention provides a surface modification method of carbon cloth for supercapacitor electrodes. The method includes the steps that firstly, inorganic salt is dissolved in distilled water to form a uniform inorganic salt solution, the carbon cloth is immersed into the inorganic salt solution several times, the carbon cloth is taken out and put into a drying oven for drying and recrystallization, and a product A is obtained; secondly, the product A is put into a tube furnace for high-temperature calcination, cleaning is carried out with distilled water to remove inorganic salt, drying is carried out, and surface-modified carbon cloth is obtained. According to the method, the solution immersion and recrystallization method is adopted, metal salt is recrystallized on the surface of the carbon cloth with the thermal evaporation method, the purposes of activation and pore formation can be synchronously achieved in the high-temperature carbonization process, the surface activity and roughness of CF are improved, and activated CF has a large specific area and rich porous structures; the method is environmentally friendly, conditions are mild, surface modification and oxidation of CF are uniform, the oxidation effect is excellent, and thus CF has good electrochemical performance when directly serving as a flexible electrode material.

Description

technical field [0001] The invention relates to a method for modifying inorganic nanometer materials. Specifically, it is a method for modifying the surface of carbon cloth. Background technique [0002] Carbon cloth is the abbreviation of "carbon fiber cloth", which is a textile composed of interlaced carbon fibers. Carbon fiber (CF) is a new type of fiber material with a carbon content of more than 95%. It not only has the inherent intrinsic characteristics of carbon materials, but also has the softness and processability of textile fibers, and has high specific strength and creep resistance. Good, low density, good thermal and chemical stability, low thermal expansion coefficient and high electrical conductivity, etc., are often used as current collectors and substrates for the preparation of flexible electrodes. Different inorganic materials, such as MnO 2 、Co 3 o 4 , TiN, etc. have been successfully grown on carbon cloth and showed good electrochemical performance....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/40
CPCY02E60/13H01G11/86H01G11/40
Inventor 程魁欧阳田曹殿学张旭叶克王贵领
Owner HARBIN ENG UNIV
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