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Method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as activator

A technology of supercapacitor and mixed molten salt, which is applied in the field of preparing activated carbon for supercapacitors, can solve the problems of increasing the corrosion of activation equipment, which is not conducive to wide application, and affects the application of activated carbon, and achieves low cost, good high-current charge and discharge performance, The effect of good cycle stability

Inactive Publication Date: 2015-06-17
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional activated carbon is generally prepared from coal. Due to the high impurity ash content of coal, the activated carbon has high impurity ash content, low specific surface area, poor adsorption performance, and poor electrochemical performance, which directly affects the application of activated carbon in many fields. application
In addition, KOH is mostly used as the activator in the preparation of activated carbon, which increases the corrosion of the activation equipment, increases the production cost, and is not conducive to its wide application.

Method used

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  • Method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as activator
  • Method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as activator
  • Method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as activator

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Using pitch as carbon source, KCl and ZnCl 2 The mixture is mixed molten salt, and activated carbon is prepared by one-step carbonization activation method. First, 35 wt% KCl and 65 wt% ZnCl 2 Mix well, then add asphalt, the ratio of mixing salt and asphalt is 3:1. The homogeneously mixed block material was placed in a tube furnace and heated to 1000 °C for 1 h at a heating rate of 5 °C / min under the protection of Ar gas to obtain a sample. The carbonized sample was pulverized, washed and dried to obtain black activated carbon.

[0028] N 2 Adsorption-desorption curves and pore size distribution curves ( figure 1 and figure 2 ) results show that its specific surface area reaches 1500 m 2 / g, the pore volume reaches 1.19 cm 3 / g, the pore size distribution is in the range of 2.5 nm~16 nm.

[0029] The results observed under the electron microscope ( image 3 ) shows that the activated carbon prepared under this condition is spherical, and the diameter of the s...

Embodiment 2

[0032] Using pitch as carbon source, KCl and ZnCl 2 The mixture is mixed molten salt, and activated carbon is prepared by one-step carbonization activation method. First, 15 wt% KCl and 85 wt% ZnCl 2 Mix well, then add asphalt, the ratio of mixing salt and asphalt is 6:1. The homogeneously mixed bulk material was placed in a tube furnace and heated to 800 °C for 2 h at a heating rate of 2 °C / min under the protection of Ar gas to obtain a sample. The carbonized sample was pulverized, washed and dried to obtain black activated carbon.

[0033] N 2 The adsorption-desorption curve results show that the specific surface area of ​​activated carbon obtained under this condition is 2000 m 2 / g, with a pore volume of 1.4 cm 3 / g. The pore size of activated carbon materials still remains in the range of 2.5 nm to 16 nm.

[0034] In this example, the specific capacitance of the activated carbon material in the aqueous electrolyte is 240 F / g, and it has good high-current charge-dis...

Embodiment 3

[0036] Using pitch as carbon source, KCl and ZnCl 2 The mixture is mixed molten salt, and activated carbon is prepared by one-step carbonization activation method. First, 25 wt% KCl and 75 wt% ZnCl 2 Mix well, then add asphalt, the ratio of mixing salt and asphalt is 1:1. Put the homogeneously mixed block material in the tube furnace, under N 2 Under gas protection, the sample was obtained by heating to 900 °C for 1.5 h at a heating rate of 10 °C / min. The carbonized sample was pulverized, washed and dried to obtain black activated carbon.

[0037] N 2 The adsorption-desorption curve results show that the specific surface area of ​​activated carbon obtained under this condition is 1000 m 2 / g, with a pore volume of 1.0 cm 3 / g. The pore size of activated carbon materials still remains in the range of 2.5 nm to 16 nm.

[0038]In this example, the specific capacitance of the activated carbon material in the aqueous electrolyte is 160 F / g, and it has good high-current char...

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Abstract

The invention discloses a method for preparing supercapacitor-dedicated active carbon by using mixed molten salts as an activator. According to the method, asphalt or coal tar which is used as a raw material is uniformly mixed with mixed molten salts; under protection of argon or nitrogen, the mixture is placed in a carbonization furnace to be carbonized; and finally, the carbonized product is crushed, washed and dried to obtain active carbon. The active carbon has high specific surface area and effective mesopore-micropore pore size distribution, and has high electrochemical specific capacity and good high-current charge discharge capability and cycling stability.

Description

technical field [0001] The invention relates to a method for preparing activated carbon for supercapacitors by using mixed molten salt as an activator. Background technique [0002] The industrial production and application of activated carbon has a long history. The activated carbon material is not amorphous carbon in the general sense, nor is it completely crystalline carbon like diamond, but has a layered structure similar to the basic microcrystals of graphite. Activated carbon is mainly carbon, combined with hydrogen, oxygen, nitrogen, etc., and has good adsorption effect. Activated carbon has a wide range of sources, high specific surface area, excellent electrical conductivity, excellent chemical stability and low expansion coefficient, and can be made into various forms according to needs, making it widely used in liquid phase adsorption, Gas phase adsorption, catalysts and their carriers, blood purification, car canisters and other fields, and become the most used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
Inventor 阎兴斌王培煜郎俊伟薛群基
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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