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

A kind of manufacturing method of positive electrode of lithium-sulfur battery

A production method and technology for lithium-sulfur batteries, which are applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as small proportion, poor shelving performance, and practical obstacles to sulfur dissolution.

Active Publication Date: 2018-01-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the research process, lithium-sulfur batteries also have some problems to be solved, among which the most daring obstacle to its practical application is the dissolution of sulfur
The intermediate products of sulfur reduction are soluble in the electrolyte, which will inevitably lead to the loss of capacity. Polysulfides will always maintain a certain concentration in the electrolyte, but the loss of this part of the sulfur active material is fixed, and the proportion of The proportion is also small; the intermediate products dissolved in the electrolyte will shuttle to the negative electrode to directly react with metal lithium, resulting in high battery self-discharge rate, poor shelf performance and low Coulombic efficiency; in addition, the most serious impact, shuttle to the negative electrode The intermediate product will undergo an irreversible chemical reaction and deposit on the surface of the lithium metal negative electrode, resulting in a decrease in the active reaction interface and accelerated capacity fading

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 kind of manufacturing method of positive electrode of lithium-sulfur battery
  • A kind of manufacturing method of positive electrode of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add PVP (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0025] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add Nafion (EW1100), and continue to sonicate for 30 minutes. (Wherein, EW refers...

Embodiment 2

[0028] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 80:10:10, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add PVP (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0029] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 80:10:10, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add Nafion (EW1100), and continue to sonicate for 30 minutes.

[0030] The above ...

Embodiment 3

[0032] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add chitosan oligosaccharide (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0033] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion In the isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), ultrasonic for 120min to disperse and mix the two evenly; then add sulfonated polyether ether ketone (sulfonated degree 80%)...

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

A method for making the positive electrode of a lithium-sulfur battery, by screening two or more polymers with different charges as the adhesive for the electrode, and cross-coating the above-mentioned slurry with different adhesives to the current collector layer by layer to prepare electrodes. The present invention can well control or slow down the diffusion of polysulfide ions into the body electrolyte, can effectively fix sulfur, and the ohmic impedance and contact internal resistance inside the electrode are reduced to a certain extent. Furthermore, due to the introduction of The ionic charge can promote the transport of lithium ions in the electrolyte.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a method for preparing a positive electrode of a lithium-sulfur battery. Background technique [0002] With the shortage of fossil energy sources, people's demand for chemical power sources is increasing and their requirements are getting higher and higher. On the big side, the environmental pollution caused by fuel vehicles and the high price of fuel make people's expectations for cost-effective electric vehicles gradually increase. The driving range of fuel vehicles is 500km, which requires the energy density of the vehicle battery to reach 550Wh / kg, while the energy density of lithium-ion power batteries currently being promoted is only about 200Wh / kg, it is difficult to reach the current level of fuel vehicles; on the small side, in recent years, portable electronic devices such as mobile phones, notebook computers, tablet computers, etc. have been widely used The po...

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 Patents(China)
IPC IPC(8): H01M4/04H01M4/139
CPCY02E60/10
Inventor 王倩张华民张洪章
Owner DALIAN INST OF CHEM PHYSICS 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