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Process for preparing high specific capacitance electrode material

An electrode material, high specific capacitance technology, applied in fixed capacitor electrodes, components of fixed capacitance, capacitors, etc., can solve the problems of small specific surface area, affecting the energy density and power density of electric double layer capacitors, etc.

Inactive Publication Date: 2003-03-12
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small specific surface area of ​​carbon airgel, it is generally within 1000m 2 / g, so the stored energy is also less, which affects the energy density and power density of electric double layer capacitors in large-scale applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take the BET specific surface area as 3200m 2 / g of activated carbon. The phenolic resin and furfural are formulated into 12g / 100ml propanol solution with a weight ratio of 1:1.6, the catalyst dosage is 8mmol / 100ml, react at 80°C for 6 days to form alcohol gel, and dry in supercritical petroleum ether for 2 The phenolic aerogel was formed within hours, and the aerogel was carbonized at 800°C for 2 hours to produce carbon aerogel. Carbon airgel specific surface area 632m 2 / g. Mix activated carbon and carbon airgel at a weight ratio of 1:0.05, ball mill for 3 hours to make the particle size of the mixture <50m, then add 2% polytetrafluoroethylene emulsion to the mixture, stir evenly, dry and shape under 10MPa pressure . The specific capacitance of the electrode material is 302F / g.

Embodiment 2

[0022] Take the BET specific surface area as 3200m 2 / g of activated carbon. Phenolic resin and furfural were formulated into 14g / 100ml propanol solution with a weight ratio of 1:1.8, the catalyst dosage was 10mmol / 100ml, reacted at 80°C for 6 days to form alcohol gel, and dried in supercritical petroleum ether for 1 The phenolic aerogel was formed within 1 hour, and the aerogel was carbonized at 900° C. for 2 hours to produce carbon aerogel. Carbon airgel specific surface area 640m 2 / g. Mix activated carbon and carbon aerogel at a weight ratio of 1:0.15, ball mill for 2 hours to make the particle size of the mixture <50m, then add 5% polytetrafluoroethylene emulsion to the mixture, stir evenly, dry and shape under 10MPa pressure . The specific capacitance of the electrode material is 312F / g.

Embodiment 3

[0024] Take the BET specific surface area as 3600m 2 / g of activated carbon. Phenolic resin and furfural were formulated into 15g / 100ml propanol solution with a weight ratio of 1:1.4, the catalyst dosage was 15mmol / 100ml, reacted at 90°C for 5 days to form alcohol gel, dried in supercritical petroleum ether for 1 The phenolic aerogel was formed within hours, and the aerogel was carbonized at 700°C for 3 hours to produce carbon aerogel. Carbon airgel specific surface area 578m 2 / g. Mix activated carbon and carbon aerogel in a weight ratio of 1:0.15, ball mill for 3 hours to make the particle size of the mixture <50m, then add 2% polytetrafluoroethylene emulsion to the mixture, stir evenly, dry and shape under 5MPa pressure . The specific capacitance of the electrode material is 320F / g.

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PUM

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Abstract

An electrode material with high specific capacitance is prepared through preparing powdered activated carbon with high specific surface area from petroleum coke or asphalt coke and KOH as activator, preparing propanol solution of phenolic resin and furfural, catalytic reaction at 60-100 deg.c for 4-7 days to obtain alcohol gel, drying in supercritical petroleum ether at 250-300 deg.C and 6-8 MPa for 1-3 hr to obtain phenolic aerol gel carbonizatino of said aerogel at 600-1000 deg.C for 1-3 hr to obtain carbon aerogel, proportional mixing, adding binder and stirring. Its advantages are high specific capacitance (330 F / g), and high electric conductivity.

Description

[0001] Field: [0002] The invention belongs to a preparation method of a high specific capacitance electrode material for an electric double layer capacitor. In particular, it relates to a method for preparing electrode materials of electric double layer capacitors by using activated carbon with high specific surface area and carbon aerogel as raw materials. Background technique: [0003] The electric double layer capacitor is a new type of energy storage device, which is made of the electric double layer formed on the interface between the electrode and the electrolyte. It has the characteristics of farad level capacitance and voltage memory function, and its power density is much higher than that of ordinary batteries. , the energy density is much higher than traditional capacitors, thus filling the gap between these two traditional technologies. Electric double layer capacitors have broad application prospects in both military and civilian applications. Electric double-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/008H01G4/01
Inventor 凌立成孟庆函张睿李开喜吕春祥
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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