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

Capacitor-used electrolyte, preparation method thereof and asymmetric electrochemical capacitor

An electrolyte and capacitor technology, applied in the field of capacitors, can solve problems such as poor cycle performance, and achieve the effects of small discharge specific capacity, good cycle performance, and increased specific capacity

Inactive Publication Date: 2014-05-14
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, compared with activated carbon / graphite capacitors, although the current graphite / activated carbon capacitors have higher voltage, their cycle performance is much worse

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Capacitor-used electrolyte, preparation method thereof and asymmetric electrochemical capacitor
  • Capacitor-used electrolyte, preparation method thereof and asymmetric electrochemical capacitor
  • Capacitor-used electrolyte, preparation method thereof and asymmetric electrochemical capacitor

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The invention provides a preparation method of an electrolyte for a capacitor, comprising the following steps:

[0043] a) Reaction of alkyl halide and triethylamine in an organic solvent to obtain alkyl-substituted tetraethylammonium halide, the alkyl halide is monohaloalkane or dihaloalkane, and the number of carbon atoms of the alkyl group in the haloalkane is 3 to 10 ;

[0044] b) mixing the alkyl-substituted tetraethylammonium halide obtained in step a) with silver oxide, and reacting to obtain alkyl-substituted tetraethylammonium hydroxide;

[0045] c) react the alkyl-substituted tetraethylammonium hydroxide obtained in step b) with fluoroboric acid to obtain alkyl-substituted tetraethylammonium tetrafluoroborate, and the alkyl replaces the tetraethylammonium in the tetraethyl One, the alkyl group is connected to N.

[0046] The present invention uses haloalkane and triethylamine as raw materials, first synthesizes alkyl-substituted tetraethylammonium halide, then...

Embodiment 1~3

[0067]Add 0.05 mol of n-propane iodide, isopropane iodide and n-butane iodide, 0.05 mol of triethylamine and 10 mL of acetonitrile into a round-bottomed flask, and heat to reflux at 95°C for 24 hours in an oil bath. The obtained reaction product was distilled off under reduced pressure to remove the solvent to obtain an orange solid. Then, ethyl acetate was used for three times of recrystallization, and the obtained crystalline product was dried in an oven at 50° C. to obtain a light yellow solid, which was alkyl-substituted tetraethylammonium iodide. The obtained pale yellow solid was dissolved in water, and then an excess of silver oxide was added thereto to remove iodide ions in the solution. The obtained mixed solution was filtered, and the pH value of the filtrate was adjusted to neutral with 40% fluoroboric acid aqueous solution, and then the water therein was distilled off under reduced pressure to obtain a crude product of quaternary ammonium salt. The crude product w...

Embodiment 4

[0077] 16g of 1,4-dibromobutane, 46mL of acetonitrile and 30g of triethylamine were successively added into the round-bottomed flask, which was heated to reflux at 90°C in an oil bath for 24h. The obtained reaction product was evaporated to dryness at 90° C., and then recrystallized with ethanol to obtain a powdery white solid. The white solid is dissolved in water, and then sufficient silver oxide is added thereto to remove bromide ions in the product. The obtained mixed solution was filtered, and the pH value of the filtrate was adjusted to neutral with 40% fluoroboric acid aqueous solution of the alkali filtrate, and then the water was removed by distillation under reduced pressure to obtain a crude product of quaternary ammonium salt. The crude product was recrystallized three times with ethanol to obtain pure quaternary ammonium salt.

[0078] The product that the present invention will obtain carries out nuclear magnetic resonance detection with nuclear magnetic resonan...

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 provides a series of capacitor-used electrolytes. The capacitor-used electrolytes are alkyl-substituted tetraethylammonium tetrafluoroborate, wherein the alkyl is connected with N, and the number of carbon atoms of the alkyl is in a range of 3 to 10. A propylene carbonate solution of the electrolyte provided by the invention is adopted as an electrolytic solution of an asymmetric electrochemical capacitor, and graphite is adopted as a negative pole material, and activated carbon is adopted as a positive pole material, and therefore, the asymmetric electrochemical capacitor can be obtained. The electrolyte provided by the invention has high solubility in the propylene carbonate solution, and therefore, the insertion of positive ions in the electrolytic solution into the electrode materials and separation of the positive ions in the electrolytic solution from the electrode materials can be benefitted, and violent expansion or contraction of the lattices of the electrode materials can be avoided, and the performance of the electrode materials can be ensured, and as a result, the cycle performance and specific capacity of the capacitor can be improved. Experimental results indicate that the discharge specific capacity of the capacitor can be as high as 35mAh / g and the capacitor can have excellent cycle performance when the electrolyte provided by the invention is applied to the asymmetric electrochemical capacitor.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a series of electrolytes for capacitors, a preparation method thereof and an asymmetric electrochemical capacitor. Background technique [0002] Electrochemical Capacitor (EC), also known as ultracapacitor (Ultracapacitor) and supercapacitor (Supercapacitor). It is a new type of energy storage device between capacitors and batteries. Compared with conventional capacitors, electrochemical capacitors have a higher specific capacity. Compared with batteries, it has higher specific power, can release large current instantly, short charging time, high charging efficiency, long cycle life, no memory effect and basically maintenance-free. Therefore, it has great potential application value in mobile communication, consumer electronics, electric vehicles, aerospace and other fields. [0003] The unit of an electrochemical capacitor is composed of a pair of electrodes, a diaphragm a...

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): H01G9/035
CPCY02E60/13
Inventor 王宏宇高继超齐力
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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