Sulfur composite material for lithium-sulfur battery and preparation method of sulfur composite material

A technology of composite materials and lithium-sulfur batteries, applied in the field of electrochemistry, to achieve the effects of improved stability, good adsorption, and good high-current discharge

Active Publication Date: 2020-03-27
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to obtain Li-S batteries with high energy density, the high sulfur loading characteristics of the electrodes are not the only condition

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
  • Sulfur composite material for lithium-sulfur battery and preparation method of sulfur composite material
  • Sulfur composite material for lithium-sulfur battery and preparation method of sulfur composite material
  • Sulfur composite material for lithium-sulfur battery and preparation method of sulfur composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a method for preparing sulfur composite materials, such as figure 1 Shown is the schematic diagram of the preparation of the sulfur composite material in this embodiment, the steps are as follows:

[0032] 1) Add 5 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. 2g of nano-sulfur (20nm) was added to the above solution, dispersed by ultrasonic at 50°C for 2h, and then stirred for 12h.

[0033] 2) Add 0.2g graphene to 50mL ethanol, ultrasonically disperse for 2h; add 0.2g carbon nanotubes to 50mL ethanol, ultrasonically disperse for 2h; add 0.1g titanium dioxide (20nm) to 50mL ethanol, ultrasonically disperse for 2h. Under stirring, the titanium dioxide dispersion was added to the carbon nanotube dispersion, and stirred at 30° C. for 5 h; then the graphene dispersion was added to the above mixture, and the stirring was continued for 12 h to prepare a nanomaterial dispersion.

[00...

Embodiment 2

[0038] This embodiment provides a method for preparing a sulfur composite material, the steps of which are as follows:

[0039] 1) Add 3 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. Add 12g of sodium thiosulfate to the above solution, then slowly add 100mL of 2M formic acid solution dropwise under stirring, and then stir for 10h. Preparation of nano-sulfur dispersion.

[0040] 2) Add 0.2g graphene to 50mL deionized water, ultrasonically disperse for 2h; add 0.2g carbon nanotubes to 50mL deionized water, ultrasonically disperse for 2h; add 0.1g titanium nitride (20nm) to 50mL deionized water, Ultrasonic dispersion 2h. Under stirring, the titanium nitride dispersion was added to the carbon nanotube dispersion, and stirred at 30°C for 5 hours; then the graphene dispersion was added to the above mixture, and continued to stir for 12 hours to prepare the nanomaterial dispersion liquid.

[0041] 3) Slowly add t...

Embodiment 3

[0045] This embodiment provides a method for preparing a sulfur composite material, the steps of which are as follows:

[0046] 1) Add 3 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. Add 15g of sodium thiosulfate to the above solution, then slowly add 120mL of 2M formic acid solution dropwise under stirring, and then stir for 10h. Preparation of nano-sulfur dispersion.

[0047] 2) Add 0.15g graphene to 100mL deionized water, ultrasonically disperse for 2h; add 0.15g carbon nanotubes to 100mL deionized water, ultrasonically disperse for 2h; add 0.3g titanium nitride (20nm) to 100mL deionized water, Ultrasonic dispersion 2h. Under stirring, the titanium nitride dispersion was added to the carbon nanotube dispersion, and stirred at 30°C for 5 hours; then the graphene dispersion was added to the above mixture, and continued to stir for 12 hours to prepare the nanomaterial dispersion liquid.

[0048] 3) Under u...

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
Areal densityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a sulfur composite material for a lithium-sulfur battery and a preparation method of the sulfur composite material, the sulfur composite material comprises a carrier and an active substance loaded on the surface of the carrier, the active substance is sulfur, and the carrier is composed of a nano-particle material, a linear nano-material and a layered nano-material. The multi-dimensional carrier is constructed by the nano materials with different microstructure, the content of active substance sulfur in the composite material can be remarkably improved, a good electronic conductive network is formed through the bridging effect of the high-conductivity nano particles and the chemical adsorption effect of the high-conductivity nano particles on polysulfide, and the charge-discharge cycle performance of the lithium-sulfur battery is improved. The sulfur content in the multi-dimensional sulfur composite material prepared by the method can be as high as 90% or above, and the initial specific discharge capacity of the composite material can reach 1290mAh / g.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a sulfur composite material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles, energy storage equipment and other fields, the requirements for battery energy density and cycle performance are more urgent. Lithium secondary batteries play a vital role in important strategic fields such as electric vehicles, power tools, smart grids, distributed energy systems, and national defense. As the current secondary battery system with the best comprehensive performance, lithium-ion batteries have the advantages of long cycle life, small self-discharge, and environmental friendliness. However, after more than 20 years of development, the lithium-ion battery has basically reached its theoretical energy density limit, and its development space is very limited. The secondary battery system to obtain hig...

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): H01M4/36H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M10/052Y02E60/10
Inventor 弓胜民张立赵尚骞杨容赵春荣孙浩博朱秀龙
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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