A preparation method of lithium sulfide battery cathode material

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems affecting the wide application of lithium-sulfur batteries, difficult to control microscopic morphology, electrode material volume expansion, etc., to enhance electrochemical performance. , the effect of improving the reversibility of the reaction and improving the utilization rate

Active Publication Date: 2018-12-14
HEBEI UNIV OF TECH +1
View PDF7 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the common disadvantages of the above technologies are: the preparation process is relatively complicated, which leads to high production costs and affects its wide application in lithium-sulfur batteries.
Moreover, the conductivity of the prepared co

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
  • A preparation method of lithium sulfide battery cathode material
  • A preparation method of lithium sulfide battery cathode material
  • A preparation method of lithium sulfide battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1:

[0040] Step 1: Improve the Hummers method to prepare graphene oxide:

[0041] 1g graphite, 27ml of 95% H 2 SO 4 , 3ml of 0.1M H 3 PO 4 Put it in a three-necked flask, add 6g potassium permanganate in portions, stir in an ice-water bath for 1 hour, raise the temperature to 50°C, and keep the temperature for 12 hours. Pour the obtained product into ice water, add 30% hydrogen peroxide while stirring, until the color of the solution turns golden yellow, then filter, and wash the product with a volume fraction of 5% HCL and distilled water until the pH is close to 7. Disperse the obtained graphite oxide in water, sonicate it for 8 hours, and finally configure it as a 2mg / ml graphene oxide solution for use;

[0042] Step 2: In-situ polymerization of acrylonitrile / graphene oxide composite material

[0043] PAN / GO composites were prepared by in-situ polymerization. First, add 125ml of deionized water, 12.5ml of acrylonitrile and 50ml of GO solution with a concentration ...

Example Embodiment

[0057] Example 2:

[0058] Step 1: Improve the Hummers method to prepare graphene oxide:

[0059] 1g graphite, 27ml of 95% H 2 SO 4 , 3ml of 0.1M H 3 PO 4 Put it in a three-necked flask, add 6g potassium permanganate in portions, stir in an ice-water bath for 1 hour, raise the temperature to 50°C, and keep the temperature for 12 hours. Pour the obtained product into ice water, add 30% hydrogen peroxide while stirring, until the color of the solution turns golden yellow, then filter, and wash the product with a volume fraction of 5% HCL and distilled water until the pH is close to 7. Disperse the obtained graphite oxide in water, sonicate it for 8 hours, and finally configure it as a 2mg / ml graphene oxide solution for use;

[0060] Step 2: In-situ polymerization of acrylonitrile / graphene oxide composite material

[0061] PAN / GO composites were prepared by in-situ polymerization. First, add 125ml of deionized water, 12.5ml of acrylonitrile and 50ml of GO solution with a concentration ...

Example Embodiment

[0074] Example 3:

[0075] Step 1: Improve the Hummers method to prepare graphene oxide:

[0076] 1g graphite, 27ml of 95% H 2 SO 4 , 3ml of 0.1M H 3 PO 4 Put it in a three-necked flask, add 6g potassium permanganate in portions, stir in an ice-water bath for 1 hour, raise the temperature to 50°C, and keep the temperature for 12 hours. Pour the obtained product into ice water, add 30% hydrogen peroxide while stirring, until the color of the solution turns golden yellow, then filter, and wash the product with a volume fraction of 5% HCL and distilled water until the pH is close to 7. Disperse the obtained graphite oxide in water, sonicate it for 8 hours, and finally configure it as a 2mg / ml graphene oxide solution for use;

[0077] Step 2: In-situ polymerization of acrylonitrile / graphene oxide composite material

[0078] PAN / GO composites were prepared by in-situ polymerization. First, add 125ml of deionized water, 12.5ml of acrylonitrile and 50ml of GO solution with a concentration ...

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

PropertyMeasurementUnit
Concentrationaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of a lithium sulfur battery cathode material. This method uses N,N-Dimethylformamide (DMF) is use as a solvent, In-situ polyacrylonitrile (PAN)/graphene oxide (GO) was dissolved in DMF to prepare spinning precursor, Continuous nanofiber membranes were prepared by electrospinning, In-situ nitrogen doped carbon fiber/reduced graphene oxide composite wasprepared by carbonization of electrospun PAN/GO fiber, At last, the nitrogen-doped carbon fiber/reduced graphene oxide/sulfur composite cathode material is prepare by the sulfur doping process, This kind of composite material with excellent conductivity and adsorption ability for polysulfide can not only make up the disadvantage of poor conductivity of elemental sulfur but also play a role of sulfur fixation and improve the shuttle effect of polysulfide in the reaction process so as to improve the electrochemical performance of lithium sulfide batteries.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material, in particular to an in-situ nitrogen-doped carbon fiber / reduced graphene oxide composite material prepared by electrospinning technology, and belongs to the field of material chemistry. Background technique [0002] With the increasing development of society, people have higher requirements for energy efficiency, portability and safety. The theoretical specific capacity of lithium-sulfur batteries is as high as 1672mAh / g (theoretical energy density can reach 2600Wh / kg), which is several times the specific capacity of existing lithium-ion cathode materials, and elemental sulfur has the advantages of abundant resources, low price and environmental friendliness, and has become a A new lithium-ion battery that has attracted much attention. However, the low conductivity of elemental sulfur and the shuttling effect of soluble polysulfides during charge and discharge ...

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): H01M4/36H01M4/38H01M4/48H01M4/60
CPCH01M4/364H01M4/38H01M4/48H01M4/602Y02E60/10
Inventor 张永光贺禹森
Owner HEBEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap