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Preparation method of composite diaphragm of lithium-sulphur battery

A composite diaphragm and lithium-sulfur battery technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of reducing battery energy density, reducing the sulfur content of the positive electrode, etc., to reduce transmission impedance, improve adsorption capacity, and increase the rate performance effect

Active Publication Date: 2015-03-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These new material structures more or less increase the specific capacity of the electrode, but will reduce the sulfur content of the positive electrode, reduce the energy density of the battery, and still cannot solve the problem of rapid capacity fading caused by the shuttle effect.

Method used

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  • Preparation method of composite diaphragm of lithium-sulphur battery
  • Preparation method of composite diaphragm of lithium-sulphur battery
  • Preparation method of composite diaphragm of lithium-sulphur battery

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The specific surface area is 1500m 2 / g metal organic framework material ZIF-8 and conductive carbon black are mixed in a mass ratio of 3:1, ball milled for 24 hours to obtain a uniformly mixed coating material, and then the uniformly mixed coating material is mixed with polyethylene oxide by mass Mix evenly at a ratio of 9:1, and disperse into a solvent, the solvent is N-methylpyrrolidone. Ultrasonic dispersion was performed for 3 hours to obtain a uniformly dispersed coating slurry, and the content of solid materials in the slurry was 80 mg / mL. The uniformly dispersed slurry was coated on the surface of the polyethylene diaphragm by spraying, and the coated diaphragm was placed in a vacuum oven at 55°C and dried for 18 hours to obtain a composite diaphragm. A sulfur positive electrode was prepared using a sulfur-carbon composite material as an active material, a lithium sheet was used as a negative electrode, and the composite separator prepared in this example and a...

Embodiment 2

[0046] The specific surface area is 1200m 2 / g metal organic framework material MOF-5 and carbon nanotubes were mixed at a mass ratio of 2.5:1, and ball milled for 24 hours to obtain a uniformly mixed coating material, and then the uniformly mixed coating material was mixed with polyvinylidene fluoride by mass Mix evenly at a ratio of 8:1, and disperse into a solvent, the solvent is N-methylpyrrolidone. Ultrasonic dispersion was performed for 3 hours to obtain a uniformly dispersed coating slurry, and the content of solid materials in the slurry was 70 mg / mL. The uniformly dispersed slurry was coated on the surface of the polypropylene diaphragm by scraping, and the coated diaphragm was placed in a vacuum oven at 60°C and dried for 15 hours to obtain a composite diaphragm. A sulfur positive electrode was prepared using a sulfur-carbon composite material as an active material, a lithium sheet was used as a negative electrode, and the composite diaphragm prepared in this embodi...

Embodiment 3

[0048] The specific surface area is 1800m 2 The metal-organic framework material MIL-53 (Al) and graphene are mixed in a mass ratio of 2:1 per gram, and ball milled for 24 hours to obtain a uniformly mixed coating material, and then the uniformly mixed coating material is mixed with polyacrylic acid by mass Mix evenly at a ratio of 9:1, and disperse into a solvent, the solvent is acetone. Ultrasonic dispersion was performed for 3 hours to obtain a uniformly dispersed coating slurry, and the content of solid materials in the slurry was 70 mg / mL. Apply the uniformly dispersed slurry on the surface of the polyethylene / polypropylene double-layer separator by spraying, put the coated separator in a vacuum oven at 65°C, and dry it for 10 hours to obtain a composite separator. A sulfur positive electrode was prepared using a sulfur-carbon composite material as an active material, a lithium sheet was used as a negative electrode, and the composite diaphragm prepared in this embodimen...

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Abstract

The invention discloses a preparation method of a composite diaphragm of a lithium-sulphur battery. The composite diaphragm is formed by modifying a coating on a diaphragm matrix. The preparation method comprises the following steps: mixing a metal organic framework material and a conductive agent according to a mass ratio of 3:1 to 1:1 to obtain a uniformly-mixed coating material; uniformly mixing the coating material with an adhesive according to a mass ratio of 9:1 to 5:1, dispersing in a solvent by adopting a mechanical mixing or ultrasonic dispersing method to obtain a uniformly dispersed coating slurry; coating the surface of the diaphragm matrix by the slurry, and drying to obtain the composite diaphragm, wherein the content of a solid material in the slurry is 60-90 mg / mL. The preparation method of the composite diaphragm of the lithium-sulphur battery is simple; large-scale production is easily realized, and strong practical value is achieved; by adopting the diaphragm in conjunction with a high-capacity electrode material, the commercialized application of the lithium-sulphur battery is effectively promoted.

Description

technical field [0001] The invention relates to a preparation method of a composite diaphragm for a lithium-sulfur battery. Background technique [0002] The rapid development of modern electronics industry and electric vehicles has put forward higher and higher requirements for battery energy density. The existing lithium-ion battery system is gradually unable to meet the requirements of these devices. Therefore, it is imperative to develop a new generation of high-energy-density battery system. [0003] The theoretical specific capacity of elemental sulfur is 1675mAh / g, and when assembled with lithium to form a battery, its theoretical energy density reaches 2600Wh / kg, which meets the requirements of electric vehicles for batteries, and also meets the requirements of "light, thin and small" batteries for portable electronic products . In addition, sulfur also has the advantages of wide sources, low cost, and environmental friendliness. Therefore, sulfur will be widely us...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/449H01M50/451
CPCH01M50/403Y02E60/10
Inventor 张治安章智勇甘永青赖延清李劼
Owner CENT SOUTH UNIV
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