Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method and application of multifunctional lithium-sulfur battery separator

A lithium-sulfur battery, multi-functional technology, applied in battery components, circuits, electrical components, etc., can solve the problems of poor blocking effect of polar polysulfides, unfavorable chemical adsorption, limited adsorption capacity, etc., to achieve inhibition of shuttle effect, easy mass production, practical effect

Active Publication Date: 2019-02-15
SUN YAT SEN UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the materials used for the coating of lithium-sulfur batteries are mostly non-polar carbon materials, such as graphene, carbon nanotubes, etc. This kind of separator can realize the physical barrier and reuse of polysulfides, but due to the It is a non-polar carbon material, which has a poor blocking effect on polar polysulfides; in addition, some researches use some inorganic substances (such as metal oxides, sulfides, etc.) The specific surface is low, the adsorption capacity is often limited, and the strong chemisorption of polysulfides is not conducive to the subsequent transformation

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
  • Preparation method and application of multifunctional lithium-sulfur battery separator
  • Preparation method and application of multifunctional lithium-sulfur battery separator
  • Preparation method and application of multifunctional lithium-sulfur battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 Preparation of modified iron-containing chitosan

[0046] Dissolve chitosan in 20mL 0.1M acetic acid solution to obtain a chitosan acetic acid solution with a chitosan concentration of 10mg / mL; then add 2mL 1.0M potassium ferricyanide solution and ultrasonicate for 5 minutes to crosslink the two A metal-containing homogeneous viscous hydrogel was obtained; then the hydrogel was dialyzed with deionized water for 3 days and freeze-dried for 24 hours to obtain a modified iron-containing chitosan aerogel.

Embodiment 2

[0047] Embodiment 2 Preparation of modified cobalt-containing chitosan

[0048] Dissolve chitosan in 15mL 0.2M acetic acid solution to obtain a chitosan acetic acid solution with a chitosan concentration of 20mg / mL; then add 2mL 1.0M potassium cobalt cyanate solution and ultrasonicate for 15 minutes to cross-link the two A metal-containing homogeneous viscous hydrogel was obtained; then the hydrogel was dialyzed with deionized water for 3 days and freeze-dried for 24 hours to obtain a modified cobalt-containing chitosan aerogel.

Embodiment 3

[0049] Embodiment 3 Preparation of modified nickel-containing chitosan

[0050] Dissolve chitosan in 15mL 0.3M acetic acid solution to obtain a chitosan acetic acid solution with a chitosan concentration of 30mg / mL; then add 2mL 0.25M nickel potassium cyanate solution and ultrasonically 10 min to crosslink the two A metal-containing homogeneous viscous hydrogel was obtained; then the hydrogel was dialyzed with deionized water for 3 days and freeze-dried for 48 hours to obtain a modified nickel-containing chitosan aerogel.

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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method and an application of a multifunctional lithium-sulfur battery separator. The battery separator comprises a separator substrate and a functional coating layer, wherein the functional coating layer is tightly attached to the surface of the separator substrate and prepared from modified chitosan, a conductive agent and an adhesive by mixing in combinationwith a tape casting method. The multifunctional lithium-sulfur battery separator has a physical barrier function for polysulfide diffusion and has a good conductive network, and sulfur utilizing ratecan be increased; meanwhile, modified chitosan has more polar groups and catalysis units, polysulfide can be effectively adsorbed chemically and promoted to be converted, shuttle effect of a batteryis inhibited, and capacity and cyclic stability of the battery are improved. Besides, the process is simple, the raw materials are cheap, practicability is high, industrialization of the lithium-sulfur battery can be promoted, and the battery separator has great economic significance in promoting development of novel high-performance energy storage systems.

Description

technical field [0001] The invention belongs to the technical field of battery materials. More specifically, it relates to a preparation method and application of a multifunctional lithium-sulfur battery separator. Background technique [0002] In the past thirty years, lithium-ion batteries have been widely researched and applied as a commonly used energy storage system. However, due to the limitation of the specific capacity of the positive electrode material, it is difficult to increase the specific energy. Therefore, research and development High-performance lithium-ion batteries and the development of new energy storage systems are of great significance to the growing demand for energy storage. Compared with lithium-ion batteries, the lithium-sulfur battery with metal lithium as the negative electrode and elemental sulfur as the positive electrode has a higher theoretical capacity (1675 mAh / g) and energy density (2600 Wh / kg), and elemental sulfur itself has no pollutio...

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 Applications(China)
IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 余丁山胡轩赫方正松
Owner SUN YAT SEN UNIV