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

Method for preparing graphene-based electrode material for super-capacitor

A graphene-based and electrode material technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve problems such as easy pulverization, poor conductivity, and weak combination of composite materials and substrates, so as to prevent agglomeration, Improved contact and low-cost reaction raw materials

Inactive Publication Date: 2013-01-30
HUNAN UNIV
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the electrostatic spray deposition technology to prepare the graphene / active material composite film directly loaded on the current collector. This method can effectively solve the problem of agglomeration in the conventional graphene preparation process, weak combination of the composite material and the substrate, and conventional composite materials. Problems of poor conductivity and easy pulverization

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
  • Method for preparing graphene-based electrode material for super-capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Cut the foamed nickel into a uniform area (4cm x 4cm), and clean it ultrasonically in acetone, ethanol, and water. Take a piece of foamed nickel and place it on the heating plate. Disperse 20 mg of graphene oxide and 240 mg of nickel acetate in a mixed solution of 5 ml of water, 20 ml of ethanol and 20 ml of ethylene glycol, stir well and transfer to a syringe. A high-voltage electrostatic field of 20kV is added between the syringe and the heating plate, and the liquid is fed at a speed of 3ml / h. The heating temperature of the heating plate is 250°C. After 2h of deposition, graphene-nickel oxide / foamed nickel composite material was obtained. figure 1 It is a scanning electron microscope picture of graphene / nickel oxide magnified 25,000 times. It can be seen that the graphene exhibits gauze-like folds and does not aggregate into large lumps.

Embodiment 2

[0019] Cut the foamed nickel into a uniform area (4cm x 4cm), and clean it ultrasonically in acetone, ethanol, and water. Take a piece of foamed nickel and place it on the heating plate. Disperse 20 mg of graphene oxide in a mixed solution of 5 ml of water, 20 ml of ethanol and 20 ml of ethylene glycol, stir well and transfer to a syringe. A high-voltage electrostatic field of 20kV is added between the syringe and the heating plate, and the liquid is fed at a speed of 3ml / h. The heating temperature of the heating plate is 250°C. After 2 hours of deposition, a graphene / nickel foam composite was obtained. In this scheme, only graphite oxide is used and no other active materials are added. The resulting film was like the gauze in Example 1.

Embodiment 3

[0021] The stainless steel sheet was cleaned ultrasonically in acetone, ethanol, and water in sequence. Take a piece of stainless steel and place it on the heating plate. Disperse 20 mg of graphene oxide and 240 mg of nickel acetate in a mixed solution of 5 ml of water, 20 ml of ethanol and 200 ml of ethylene glycol, stir well and transfer to a syringe. A high-voltage electrostatic field of 20kV is added between the syringe and the heating plate, and the liquid is fed at a speed of 3ml / h. The heating temperature of the heating plate is 250°C. After 2 hours of deposition, the graphene-active material / current collector composite material was obtained. In this scheme, stainless steel sheet is used as the current collector, and the others are unchanged. The graphene / nickel oxide composite material in the form of a gauze as in Example 1 was obtained.

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 method for preparing a graphene-based composite material for a super-capacitor on the basis of an electrostatic spray deposition technology, and belongs to the field of storage of new generation of energy. The method comprises the following steps of: (1) cleaning a current collector, and placing the current collector on a heating plate; (2) dispersing an aqueous solution and an active material of oxidized graphene in a mixed solution consisting of water, ethanol, ethylene glycol and propylene glycol, stirring the mixture, performing ultrasonic treatment on the mixture, uniformizing the mixture and then transferring the mixture to a syringe; and (3) adding a high-voltage electrostatic field between the syringe and a base plate, feeding liquid at the pushing speed of 3-15ml / h, keeping the heating temperature of the heating plate in a range of 200-300 DEG C, and depositing the mixture for 2-10 hours so as to obtain a graphene-active material / current collector composite material. The problem of agglomeration in a process of preparing graphene-based composite materials by using the conventional chemical method is solved. The oxidized graphite is assembled into a porous structure on an electrode in the reduction and drying processes, contact conditions of the material and the current collector are improved, and embedment / separation of lithium ions in the material is facilitated. The method is simple in process; and the graphene-based component material is easy to produce in batches, and has high practical value.

Description

Technical field [0001] The invention belongs to the field of new generation energy storage, and particularly relates to a method for preparing graphene-based electrode materials for supercapacitors. Background technique [0002] Because conventional fuel cells and chemical battery products have short service life, poor temperature characteristics, environmental pollution, complex systems, and high costs, researchers have been looking for alternative energy storage methods. The supercapacitor has the advantages of high current charge and discharge, long cycle life, low cost, simple structure, etc., can partially or completely replace traditional chemical batteries, and has a wider range of uses than traditional chemical batteries (Huang, Y., et al., Small, 2012.8:1805). [0003] Nano-scale particles have quantum size effects, surface effects and macro-quantum tunneling effects, exhibiting many unique properties, and have broad applications in the field of supercapacitors. Due to t...

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
IPC IPC(8): H01G11/86H01G11/32
CPCY02E60/13
Inventor 李秋红张海明王太宏陈立宝
Owner HUNAN 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