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

A kind of preparation method and application of lithium-sulfur battery separator

A lithium-sulfur battery and separator technology, applied in the field of preparation of lithium-sulfur battery separators, can solve the problems of poor polar polysulfide barrier effect, unfavorable chemical adsorption, limited adsorption capacity, etc. Production, practical effect

Active Publication Date: 2020-09-01
SUN YAT SEN UNIV
View PDF5 Cites 0 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 studies 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
  • A kind of preparation method and application of lithium-sulfur battery separator
  • A kind of preparation method and application of lithium-sulfur battery separator
  • A kind of preparation method and application of lithium-sulfur battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation of embodiment 1 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 ferricyanate solution and ultrasonicate for 5min to crosslink the two to obtain Metal-containing homogeneous viscous hydrogel; then, the hydrogel is dialyzed with deionized water for 3 days, and freeze-dried for 24 hours to obtain the modified iron-containing chitosan airgel.

Embodiment 2

[0047] The preparation of embodiment 2 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 cobaltcyanate solution and ultrasonically 15min to crosslink the two to obtain Metal-containing homogeneous viscous hydrogel; then, the hydrogel is dialyzed with deionized water for 3 days, and freeze-dried for 24 hours to obtain the modified cobalt-containing chitosan airgel.

Embodiment 3

[0049] The preparation of embodiment 3 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 10min to crosslink the two to obtain Metal-containing homogeneous viscous hydrogel; then the hydrogel was dialyzed with deionized water for 3 days, and freeze-dried for 48 hours to obtain the modified nickel-containing chitosan airgel.

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 application of a multifunctional lithium-sulfur battery diaphragm. The battery diaphragm is composed of a diaphragm base and a functional coating layer. The functional coating layer is closely attached to the surface of the diaphragm base, and is prepared by mixing modified chitosan, a conductive agent and a binder, and combining tape casting. The multifunctional lithium-sulfur battery separator of the present invention has a physical barrier effect on the diffusion of polysulfides, and has a good conductive network, which can improve the utilization rate of sulfur; at the same time, because the modified chitosan has more polar groups and The catalytic unit can effectively chemically adsorb polysulfides and promote their conversion, inhibit the shuttle effect of the battery, and improve the capacity and cycle stability of the battery. In addition, the invention has simple process, low raw material cost and strong practicability, is beneficial to promote the industrialization of lithium-sulfur batteries, and has important economic significance for promoting the development of high-performance new 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 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 metallic lithium as the negative electrode and elemental sulfur as the positive electrode has a higher theoretical capacity (1675mAh / g) and energy density (2600Wh / kg), and the elemental sulfur itself has pollution-free, source...

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