Method for Improving Volume Specific Capacitance of Rice Husk Based Capacitor Carbon

A capacitive carbon, volume ratio technology, applied in hybrid capacitor electrodes, chemical instruments and methods, hybrid/electric double layer capacitor manufacturing, etc., can solve the poor conductivity of rice husk capacitor carbon, difficulty in transporting electrolyte ions, affecting volume specific capacitance, etc. problems, to achieve the effect of improving electrochemical performance, pollution-free price, and a wide range of sources

Active Publication Date: 2022-03-18
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The conductivity of rice husk capacitor carbon is poor, which makes it difficult to transport electrolyte ions;
[0007] 3. The tap density is low, which affects the volume specific capacitance

Method used

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  • Method for Improving Volume Specific Capacitance of Rice Husk Based Capacitor Carbon
  • Method for Improving Volume Specific Capacitance of Rice Husk Based Capacitor Carbon
  • Method for Improving Volume Specific Capacitance of Rice Husk Based Capacitor Carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) The raw material rice husk is screened to remove impurities, and crushed to a particle size of 10 mm to 20 mm to obtain rice husk powder, which is set aside;

[0039] (2) Place the rice husk powder obtained in step (1) in a tube furnace, and under the protection of nitrogen, heat up to 200°C at a heating rate of 5°C / min, pyrolysis and dehydration for 0.5h, and then heat up to 200°C at a heating rate of 5°C / min The heating rate is increased to 500°C, pyrolyzed for 1 hour, and pyrolytic charcoal is obtained;

[0040] (3) Mix the pyrolytic carbon obtained in step (2) with the NaOH solution with a concentration of 5wt% according to the solid-to-liquid ratio of 1Kg:10L, heat and reflux for 2h, suction filter after cooling down to room temperature, wash the filter cake with water until neutral, and dry , to obtain desiliconized rice husk pyrolytic carbon;

[0041] (4) Add the desiliconized rice husk pyrolytic carbon and sodium hydroxide obtained in step (3) into the high...

Embodiment 2

[0043] (1) The raw material rice husk is screened to remove impurities, crushed to a particle size of 10mm-20mm, and mixed with NH with a concentration of 5wt%. 4 The OH solution was added into the reaction kettle according to the solid-to-liquid ratio of 1Kg: 10L, sealed and heated to 120°C, pressurized and impregnated for 1h, and filtered after cooling down to room temperature, the filtrate was recycled after adjusting the concentration, and the filter cake was dried at 100°C to obtain Catalyst treatment rice husk, standby;

[0044] (2) Place the catalyst-treated rice husk obtained in step (1) in a tube furnace, and under the protection of nitrogen, heat up to 200°C at a heating rate of 5°C / min, pyrolyze for 0.5h, and then heat up to 200°C at a heating rate of 5°C / min. The heating rate is increased to 500°C, pyrolyzed for 1 hour, and pyrolytic charcoal is obtained;

[0045](3) The pyrolytic charcoal obtained in step (2) is mixed with a NaOH solution having a concentration o...

Embodiment 3

[0048] (1) The raw material rice husk is screened to remove impurities, crushed to a particle size of 10mm-20mm, and mixed with NH with a concentration of 5wt%. 4 The OH solution was added into the reaction kettle according to the solid-to-liquid ratio of 1Kg:10L, sealed and heated to 120°C, pressurized and impregnated for 1h, cooled to room temperature and filtered with suction, the filtrate was recycled after adjusting the concentration, and the filter cake was dried at 100°C to obtain Catalyst treatment rice husk, standby;

[0049] (2) Place the catalyst-treated rice husk obtained in step (1) in a tube furnace, and under the protection of nitrogen, first raise the temperature to 200°C at a heating rate of 5°C / min, pyrolyze for 0.5h, and then raise the temperature at a heating rate To 500°C, pyrolyze for 1 hour to obtain catalytic pyrolytic carbon;

[0050] (3) The catalytic pyrolytic carbon obtained in step (2) is mixed with a NaOH solution having a concentration of 5wt% a...

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Abstract

The invention discloses a method for improving the volume specific capacitance of rice husk-based capacitor carbon, which belongs to the field of biomass energy chemical industry. Three methods are used to increase the tap density and volume specific capacitance; specifically, it involves: (1) impregnating treatment with a dehydration carbon-fixing catalyst , temperature-controlled pyrolysis to increase the fixed carbon content; (2) After hydrothermal desiliconization of pyrolytic carbon, the template carbon is treated with impregnated pitch to fill the micropores caused by gasification and increase the tap density; (3) Modified with electrode pitch Modified capacitor carbon surface to improve conductivity and tap density. Compared with the prior art, the invention prepares the rice husk-based capacitor carbon through different modification methods, and improves the tap density, volume specific capacitance, cycle stability and yield of the capacitor carbon.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry, and discloses a method for increasing the volume specific capacitance of rice husk-based capacitor carbon, in particular to impregnating rice husk with a dehydration carbon-fixing catalyst, impregnating asphalt to treat template carbon, and modifying electrode pitch to modify capacitor carbon to improve rice Shell carbon volume specific capacitance method. Background technique [0002] Biomass materials have the characteristics of wide sources and environmental friendliness. In recent years, the use of biomass as raw material to prepare capacitor carbon has received extensive attention. Rice husk is a renewable biomass resource with low price and huge output. Capacitor carbon prepared from rice husk has a multi-level pore structure and a large specific surface area. However, rice husk-based capacitor carbon is used as a supercapacitor electrode material The main problem is that t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348H01G11/44H01G11/34H01G11/86
CPCH01G11/34H01G11/44H01G11/86C01B32/324C01B32/348Y02P20/10
Inventor 王子忱金璐薛北辰陈志敏杨晓敏
Owner JILIN UNIV
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