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

Positive electrode of lithium sulfur secondary battery

A lithium-sulfur secondary battery, cathode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of reducing battery mass specific energy and volume energy density, large volume and mass, and not providing capacity, etc. Achieve the effects of suppressing the shuttle effect, simple cathode structure, and compatible coating process

Active Publication Date: 2019-06-14
ZHEJIANG UNIV OF TECH
View PDF12 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the additional adsorption layer occupies a large volume and mass, does not provide capacity itself, and will inevitably reduce the overall mass specific energy and volumetric energy density of the battery.

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
  • Positive electrode of lithium sulfur secondary battery
  • Positive electrode of lithium sulfur secondary battery
  • Positive electrode of lithium sulfur secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029](1) After grinding and mixing elemental sulfur with a mass ratio of 70:30 and activated carbon, heat to 165°C to melt the sulfur and infiltrate into the activated carbon to obtain a sulfur / carbon composite material. Mix the obtained sulfur / carbon composite material with acetylene black and carboxymethyl cellulose at a ratio of 70:20:10, add an appropriate amount of water to make a slurry, coat it on the aluminum foil fluid, and dry it naturally at 100°C and dried under vacuum for 24 hours to obtain a sulfur-containing cathode material layer with a thickness of 100 microns.

[0030] (2) Grind and mix lithium vanadate with acetylene black and polyvinylidene fluoride at a ratio of 85:10:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer , dried in a vacuum at 100°C for 24 hours after natural drying, and the thickness was 50 microns.

[0031] The obtained double-layer structure lithi...

Embodiment 2

[0033] (1) After grinding and mixing elemental sulfur with a mass ratio of 70:30 and activated carbon, heat to 165°C to melt the sulfur and infiltrate into the activated carbon to obtain a sulfur / carbon composite material. Mix the obtained sulfur / carbon composite material with acetylene black and carboxymethyl cellulose at a ratio of 70:20:10, add an appropriate amount of water to make a slurry, coat it on the aluminum foil fluid, and dry it naturally at 100°C and dried under vacuum for 24 hours to obtain a sulfur-containing cathode material layer with a thickness of 60 microns.

[0034] (2) Grind and mix ferrous disulfide with acetylene black and polyvinylidene fluoride at a ratio of 80:15:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer After air drying, vacuum drying at 100°C for 24 hours, the thickness is 20 microns.

[0035] (3) After grinding and mixing elemental sulfur with a ...

Embodiment 3

[0039] (1) After grinding and mixing elemental sulfur with a mass ratio of 50:50 and activated carbon, heat to 165°C to melt the sulfur and infiltrate into the activated carbon to obtain a sulfur / carbon composite material. Mix the obtained sulfur / carbon composite material with acetylene black and styrene-butadiene rubber emulsion to make slurry, the mass ratio of sulfur / carbon composite material to acetylene black and styrene-butadiene rubber is 70:20:10, and coat it on the aluminum foil fluid , dried naturally and then vacuum-dried at 100°C for 24 hours to obtain a sulfur-containing cathode material layer with a thickness of 100 microns.

[0040] (2) Grind and mix lithium iron phosphate with acetylene black and polyvinylidene fluoride at a ratio of 80:15:5, add an appropriate amount of N-methylpyrrolidone as a solvent to make a slurry, and coat it on the sulfur-containing cathode material layer , dried in a vacuum at 100°C for 24 hours after natural drying, and the thickness ...

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
Total thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The purpose of the invention is to provide a positive electrode of a lithium sulfur secondary battery. The positive electrode of the lithium sulfur secondary battery comprises 1 to 5 layers of sulfur-containing positive electrode material layers and 1 to 5 layers of lithium-stored material layers containing a transition metal element; and the sulfur-containing positive electrode material layers and the lithium-stored material layers are alternately coated. The total thickness of the positive electrode is 50 to 800 microns, the thickness of each sulfur-containing positive electrode material layer is 1 to 500 microns, and the thickness of each lithium-stored material layer is 1 to 200 microns. The electrode provided by the invention can suppress the shuttle effect, has a lithium storage performance, and can provide partial capacity; and the positive electrode of the lithium sulfur secondary battery can provide more active sites for lithium sulfide and improve the utilization of sulfur.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur secondary batteries, in particular to a positive electrode of the lithium-sulfur secondary battery. Background technique [0002] Lithium-sulfur secondary battery is a high specific energy electrochemical energy storage system, which mainly uses sulfur as the positive electrode active material, metal lithium as the negative electrode, and lithium salt ether solution as the electrolyte. The theoretical specific capacity of elemental sulfur is as high as 1675mAh / g, which is 10 times that of the layered lithium cobalt oxide cathode material. However, the conductivity of sulfur is very poor. In order to make full use of the active substance sulfur in the electrode, a large amount of conductive agent needs to be added. More importantly, the discharge intermediate product of sulfur is highly soluble polysulfide ions, which are easy to diffuse to the negative electrode and undergo self-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): H01M4/13H01M4/136H01M4/36H01M4/58H01M4/62
CPCY02E60/10
Inventor 张俊张文魁黄辉夏阳甘永平梁初
Owner ZHEJIANG UNIV OF TECH
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