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Preparation method of carbon material for supercapacitor, carbon material and application of carbon material

A technology for supercapacitors and carbon materials, which is applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve the problems of hindering the performance of supercapacitors, the ash content of carbon materials is not low enough, and the specific surface area is not high enough to improve activation and pore formation ability, increase the probability of reaction participation and degree of reaction, and activate the effect of surface structure characteristics

Pending Publication Date: 2020-11-17
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the alkali activation method is mainly used to prepare carbon materials for supercapacitors, and most of them use carbon-containing precursors to directly mix with alkali for activation, resulting in most of the alkali melting and adhering to the reactor, resulting in insufficient activation and low capacitance; in addition, Without subsequent washing to reduce ash and reduce deoxidation functional groups, the internal resistance will increase and the attenuation will be obvious, which will lead to defects such as insufficient ash content, insufficient specific surface area, small number of micropores, low specific capacitance and large internal resistance of the carbon material. impedes the improvement of supercapacitor performance

Method used

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  • Preparation method of carbon material for supercapacitor, carbon material and application of carbon material
  • Preparation method of carbon material for supercapacitor, carbon material and application of carbon material

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preparation example Construction

[0038] One embodiment of the present invention provides a method for preparing carbon materials for supercapacitors, comprising the following steps:

[0039] Step 102, uniformly mixing a certain amount of pretreated carbon-containing precursor with a certain amount of co-activator, and performing high-temperature activation treatment;

[0040] Step 104, mixing the first product obtained after the high-temperature activation treatment with a certain amount of mixed acid solution, heating and stirring, suction filtering, washing, drying after the reaction, and setting aside;

[0041] Step 106, reacting the second product obtained in step 104 with a certain amount of mixed gas of nitrogen and hydrogen at high temperature.

[0042] As a preferred implementation manner, in step 102, the pretreatment includes: grinding a certain amount of carbon-containing precursor into fine powder.

[0043] As a preferred embodiment, in step 102, the carbon-containing precursor is a mixture of pe...

Embodiment 1

[0060] The present embodiment provides a kind of preparation method of supercapacitor carbon material, comprises the following steps:

[0061] (1) 100g petroleum coke and 60g coal tar pitch particles are ground into 300 mesh fine powder;

[0062] (2) Mix 150g of the fine powder obtained in step (1) with 450g of sodium hydroxide evenly at a stirring speed of 400r / min, then place it on a flat die roller compactor under a pressure of 10MPa for 2h, and then squeeze it under a pressure of 35MPa into a 1mm cylindrical shape to obtain a columnar precursor;

[0063] (3) The columnar precursor obtained in step (2) was raised from room temperature to 200°C in a tube furnace, pre-oxidized by passing 120L / h air for 6h, and naturally cooled to room temperature to obtain a pre-oxidized precursor;

[0064] (4) The pre-oxidized precursor obtained in step (3) was activated in a high-temperature tube furnace from room temperature to 800°C for 6 hours at a constant temperature, and then cooled ...

Embodiment 2

[0071] The present embodiment provides a kind of preparation method of supercapacitor carbon material, comprises the following steps:

[0072] (1) 120g petroleum coke and 80g coal tar pitch particles are ground into 250 mesh fine powder;

[0073] (2) Mix the fine powder obtained by 200g of step (1) with 1000g of potassium carbonate at a stirring speed of 400r / min, then leave it on a flat die roller compactor for 3h under a pressure of 12MPa, and then extrude under a pressure of 30MPa to form 3mm cylindrical, to obtain a columnar precursor;

[0074] (3) Raise the columnar precursor obtained in step (2) from room temperature to 300°C in a tube furnace, pass 85L / h air into it for pre-oxidation for 4.5h, and naturally cool down to room temperature to obtain a pre-oxidized precursor;

[0075] (4) The pre-oxidized precursor obtained in step (3) was activated in a high-temperature tube furnace from room temperature to 800°C for 4.5 hours at a constant temperature, and then cooled do...

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Abstract

The invention provides a preparation method of a carbon material for a supercapacitor, the carbon material and application of the carbon material, and the preparation method of the carbon material forthe supercapacitor comprises the following steps: step 102, uniformly mixing a certain amount of pretreated carbon-containing precursor with a certain amount of co-activator, and carrying out high-temperature activation treatment; and step 104, mixing the first product obtained after high-temperature activation treatment with a certain amount of mixed acid solution, performing heating and stirring, and performing suction filtration, washing and drying for later use after the reaction is finished. According to the preparation method, the raw materials are cheap and easy to obtain, the processis simple and controllable, the operation conditions are mild, industrial production can be achieved, and the carbon material prepared through the preparation method has the characteristics of being high in specific surface area, high in specific capacitance, small in internal resistance and the like.

Description

technical field [0001] The invention relates to the field of supercapacitors, in particular to a preparation method of a carbon material for a supercapacitor, a carbon material and an application thereof. Background technique [0002] Due to its high power density, long cycle life, and high safety, supercapacitors have a wide range of applications, ranging from backup power for storage and power supplies for electric toys, to high-power starting systems for aerospace missile launches, and energy power for electric vehicles. system etc. The core material of supercapacitors is carbon materials, and the main factors affecting the electrochemical performance are the pore structure and surface chemical properties of carbon materials. At present, the alkali activation method is mainly used to prepare carbon materials for supercapacitors, and most of them use carbon-containing precursors to directly mix with alkali for activation, resulting in most of the alkali melting and adheri...

Claims

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Application Information

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IPC IPC(8): C01B32/318C01B32/348C01B32/354H01G11/24H01G11/32
CPCC01B32/318C01B32/348C01B32/382H01G11/24H01G11/32Y02E60/13
Inventor 张长明王建成霍启煌陈慧君
Owner TAIYUAN UNIV OF TECH
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