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Double electric layer capacitor and its preparing method

A technology of electric double-layer capacitors and capacitance, which is applied in the manufacture of hybrid/electric double-layer capacitors, capacitors, electrolytic capacitors, etc., can solve the problems of wide pore size distribution, affecting service life, and affecting capacitor performance, etc. Capacity, high charge and discharge rate, effect of improving microstructure and performance

Inactive Publication Date: 2008-01-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method uses petroleum coke as raw material, KOH as activator, and the activation ratio is 2 to 4. Through the process of preactivation (temperature: 300-600°C) and activation (temperature: 700-1200°C), the ratio of activated carbon prepared is The surface is 2000~3500m 2 / g, but because its activation ratio is too large, it is not conducive to industrialization
[0009] At present, the research on electric double layer capacitors mainly focuses on how to expand the specific surface of the carbon electrode and control the pore distribution, but the capacitor electrodes prepared by the existing methods generally have a wide pore size distribution and a low microporosity (generally Less than 75%) deficiency, which in turn affects the performance of the capacitor
Can not give full play to the characteristics of fast charging and discharging of electric double layer capacitors, which increases the performance loss of electric double layer capacitors and affects their service life

Method used

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  • Double electric layer capacitor and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 100g petroleum coke, use 200gKOH, 5gCa(OH) 2 The solid mixture is used as a compound activator. After mixing, it is pre-activated in a low-temperature activation furnace for about 2 hours under the protection of nitrogen. The activation temperature is 200°C. The material is then transferred to a high-temperature activation furnace and activated at 750°C for about 1 hour. After activation, the material is taken out And washed with water to neutral (pH=7), then soaked in dilute hydrochloric acid with a concentration of 0.01mol / l for about 30 minutes, and finally dried at 100°C and 0.092MPa vacuum for 2 hours to obtain powder activated carbon.

[0029] Take 2g of graphite and 5g of polytetrafluoroethylene and add it to the above-mentioned powdered activated carbon, press it with a 50-mesh stainless steel mesh at 80MPa and 150°C to make it 0.5mm thick and 5cm in area. 3 2 activated carbon electrodes. The stainless steel mesh is pressed in the middle of the carbon elec...

Embodiment 2

[0032] Take 100g petroleum coke powder, use 300gKOH, 10gCa(OH) 2 , 5gZnCl 2 The solid mixture is used as a complex activator. After mixing, activate in a low-temperature activation furnace for 2.5 hours at an activation temperature of 150°C, then transfer to a high-temperature activation furnace and activate at 800°C for 0.5 hours. After activation, the material is taken out and washed with water until neutral, then soaked in 0.01mol / l dilute hydrochloric acid for about 30 minutes, and finally dried at 120°C and 0.092MPa vacuum for 2 hours to obtain powder activated carbon.

[0033] Add 15g of carbon black and 60g of coal tar to the above-mentioned powdered activated carbon, and press it with 200-mesh stainless steel mesh at 100MPa and 140°C to make it 0.4mm thick and 6cm in area. 32 activated carbon electrodes. The stainless steel mesh is pressed in the middle of the carbon electrode and integrated with the electrode.

[0034] Put the two above-mentioned activated carbon ...

Embodiment 3

[0036] Take 100g lignin, use 300gKOH, 2gCa(OH) 2 , 10g NaOH solid mixture as composite activator. After mixing, activate in a low-temperature activation furnace for about 1.5 hours, the activation temperature is 550°C, then transfer to a high-temperature activation furnace, and activate at 700°C for about 1 hour. After activation, the material is taken out and washed with water until neutral, then soaked in 0.01mol / l dilute hydrochloric acid for 30 minutes, and finally dried at 100°C and 0.092MPa vacuum for 2 hours to obtain powder activated carbon.

[0037] Take 15g of polyaniline (PAn) and 60g of polytetrafluoroethylene (PTFE) and add them to the above-mentioned powdered activated carbon, and press it with 200-mesh stainless steel mesh at 90MPa and 140°C to form a thickness of 0.6mm and an area of ​​5cm 3 2 activated carbon electrodes. The stainless steel mesh is pressed in the middle of the carbon electrode and integrated with the electrode.

[0038] Put the two above-me...

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Abstract

This invention provides a double-electric layer condenser, in which, active carbon electrode microhole diameter distribution is 1-2nm, microhole rate is over 90%, BET specific surface is 2500-3500sq. m / g, micrhole capacity is 1.5-1.8cu cm / g, capacitance is 100-150f / g, electrode density is 0.5-0.6g / cu cm, the bulk capacitance: 50-80f / cu cm. The preparation method is: applying a compound active agent to activate the material under low and high temperature separately to prepare the electrode material and put a mesh collector between the electrode to the added with suitable additives and adhesives and pressed.

Description

technical field [0001] The invention relates to a capacitor and its preparation method, in particular to an electric double layer capacitor and its preparation. Background technique [0002] With the development of the economy, the demand for electric energy has increased year by year, and the utilization of electricity has penetrated into all areas of people's lives, especially in mobile areas, the rapid growth of electricity consumption has correspondingly driven the rapid development of power storage components. At present, the most widely used and deeply researched components are mainly concentrated on capacitors. [0003] Electric double layer capacitors store charges through the electric double layer generated between the electrode / solution interface by electrostatic attraction. Since the distance between the two parallel electrode plates in contact with the interface is similar to the molecular diameter, it is also called a differential capacitor. Its electrostatic c...

Claims

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Application Information

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IPC IPC(8): H01G9/155H01G13/00H01G9/042H01G11/24H01G11/86
CPCY02E60/13
Inventor 陈进富徐文东李秀花陆绍信
Owner CHINA UNIV OF PETROLEUM (BEIJING)