Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Asymmetric electrochemical supercapacitor on basis of rice-husk-based activated carbon materials

A supercapacitor and activated carbon-based technology, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems that have not been paid attention to, the decrease in conductivity, and the increase in the equivalent resistance of electrochemical supercapacitors, so as to achieve cost reduction, wide source of raw materials, and broaden applications range effect

Inactive Publication Date: 2013-12-04
JILIN UNIV
View PDF7 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of these activated carbons prepared from rice husks in electrochemical supercapacitors, especially in asymmetric electrochemical supercapacitors, has not received much attention.
This is due to the fact that activated carbon prepared from rice husk usually contains more SiO 2 , so that the electrical conductivity decreases, which leads to an increase in the equivalent resistance of the electrochemical supercapacitor, that is, activated carbon suitable for use as an adsorption material may not necessarily be used as an electrode material for an electrochemical supercapacitor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of rice husk-based activated carbon:

[0022] (1) Wash, dry and grind the rice husk;

[0023] (2) The rice husks treated in step (1) were carbonized at 400°C for 1.5 hours under the protection of nitrogen, treated with 10% hydrochloric acid, washed with water, and dried;

[0024] (3) Mix the carbonization product of step (2) with potassium hydroxide at a mass ratio of 1:3, and the volume-to-mass ratio of the added water to the mixture is 3:1 (mL / g), mix well, dry, and control the temperature rise Speed ​​10°C / min, activate at 750°C for 1h;

[0025] (4) Soak the activated product in water at 90°C, filter, wash with boiling water until neutral, and dry at 100°C for 12 hours to obtain a rice husk-based activated carbon material with a specific surface area of ​​3235m 2 / g, average pore diameter 2.0nm;

[0026] Rice husk-based activated carbon electrode preparation: Disperse rice husk-based activated carbon, acetylene black, and PTFE in ethanol at a mass rati...

Embodiment 2

[0030] Preparation of rice husk-based activated carbon:

[0031] (1) Wash, dry and grind the rice husk;

[0032] (2) The rice husks treated in step (1) were carbonized at 400°C for 2 hours under the protection of argon, treated with 5% hydrochloric acid, washed with water, and dried;

[0033](3) Mix the carbonization product of step (2) with potassium hydroxide at a mass ratio of 1:4, and the volume-to-mass ratio of the added water to the mixture is 2:1 (mL / g), mix well, dry, and control the temperature rise Speed ​​10°C / min, activate at 700°C for 2h;

[0034] (4) Soak the activated product in water at 100°C, filter, wash with boiling water until neutral, and dry at 100°C for 12 hours to obtain a rice husk-based activated carbon material with a specific surface area of ​​2824m 2 / g, the average pore diameter is 2.4nm;

[0035] Preparation of rice husk-based activated carbon electrode: Disperse rice husk-based activated carbon, acetylene black, and PTFE in ethanol at a mass ...

Embodiment 3

[0039] Preparation of rice husk-based activated carbon:

[0040] (1) Wash, dry and grind the rice husk;

[0041] (2) The rice husks treated in step (1) were carbonized at 450°C for 1 hour under the protection of nitrogen, treated with 10% sulfuric acid, washed with water, and dried;

[0042] (3) Mix the carbonization product of step (2) with sodium hydroxide at a mass ratio of 1:3, and the volume-to-mass ratio of the added water to the mixture is 4:1 (mL / g), mix well, dry, and control the temperature rise Speed ​​15°C / min, activate at 700°C for 2h;

[0043] (4) Soak the activated product in water at 70°C, filter, wash with boiling water until neutral, and dry at 100°C for 12 hours to obtain a rice husk-based activated carbon material with a specific surface area of ​​2932m 2 / g, the average pore diameter is 2.2nm;

[0044] Preparation of rice husk-based activated carbon electrode: Mix rice husk-based activated carbon, acetylene black, and PVDF in a mass ratio of 80:10:10, m...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to application of rice-husk-based activated carbon materials to an asymmetric electrochemical supercapacitor, belongs to the technical field of chemical power sources, and aims to provide an asymmetric electrochemical supercapacitor on the basis of rice-husk-based activated carbon. The asymmetric electrochemical supercapacitor comprises a positive pole, a negative pole, a diaphragm, electrolyte, a positive lead, a negative lead and a shell. The positive pole or the negative pole of the asymmetric electrochemical supercapacitor contains the rice-husk-based activated carbon which is used as an activated substance, the pole containing the rice-husk-based activated carbon is used for implementing an electric double-layer energy storage principle, the other pole is a pseudo-capacitive pole or battery pole, and the electrolyte is aqueous electrolyte or organic electrolyte. The asymmetric electrochemical supercapacitor has the advantages that the electric double-layer energy storage pole of the asymmetric electrochemical supercapacitor is made of the rice-husk-based activated carbon which has wide raw material sources and is advantageous in terms of price, accordingly, the cost of the electrochemical supercapacitor can be lowered, and the application range of the rice-husk-based activated carbon which is made of agricultural waste is broadened.

Description

technical field [0001] The patent of the invention relates to the application of a rice husk-based activated carbon material in an asymmetric electrochemical supercapacitor, which belongs to the technical field of chemical power sources. Background technique [0002] Electrochemical supercapacitor is an energy storage element between batteries and traditional capacitors. Compared with secondary batteries, electrochemical supercapacitors have the characteristics of long life and high power density, and are especially suitable for occasions requiring large current discharge. Such as the start of electric vehicles, is receiving widespread attention. However, supercapacitors still face many problems in commercial applications, and their energy density is lower than that of batteries such as lithium-ion batteries and nickel-metal hydride batteries. In order to increase the energy density of electrochemical supercapacitors, an effective way is to adopt an asymmetric structure, th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/44H01G11/34
CPCY02E60/13
Inventor 林海波闻斌刘德臣李阳陆海彦张文礼
Owner JILIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com