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Preparation method of tungsten oxide/clay mineral nanomaterial modified diaphragm for lithium-sulfur battery

A technology of clay minerals and nanomaterials, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc.

Active Publication Date: 2021-09-10
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a tungsten oxide suitable for lithium-sulfur batteries in order to solve the technical defects of existing commercial diaphragms in the application of lithium-sulfur batteries / Preparation method of clay mineral nanomaterials modified separator to promote the development of next-generation high energy density lithium-sulfur batteries

Method used

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  • Preparation method of tungsten oxide/clay mineral nanomaterial modified diaphragm for lithium-sulfur battery
  • Preparation method of tungsten oxide/clay mineral nanomaterial modified diaphragm for lithium-sulfur battery
  • Preparation method of tungsten oxide/clay mineral nanomaterial modified diaphragm for lithium-sulfur battery

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Preparation of tungsten oxide / clay mineral nanomaterials: Add 3 mg tungsten chloride to 30 mL deionized water, stir, and sonicate until dissolved; then add 3 mg halloysite nanoparticles to the above solution, stir, Ultrasonic treatment to obtain a uniform suspension, adjust the pH of the suspension to 2.6; then transfer to the reaction kettle, dry at 180°C for 24 h, and then wash with deionized water and ethanol three times, dry and grind to obtain tungsten oxide / angstrom Rocky nanomaterials;

[0034] (2) Preparation of modified diaphragm: Mix tungsten oxide / halloysite nanomaterials, acetylene black, and polyvinylidene fluoride at mass fractions of 75%, 15%, and 10%, and ball mill, then add N , N -Dimethylformamide adjusts the viscosity of the slurry to 1000 mPs s, and obtains a uniform slurry by stirring; then, the above slurry is coated on one side of the polyethylene diaphragm by roller coating, and dried at 60°C for 24 hours to obtain an oxidized slurry. Separ...

Embodiment 2

[0037] (1) Preparation of tungsten oxide / clay mineral nanomaterials: Add 6 mg hexahydroxytungsten to 45 mL ethanol, stir, and sonicate until dissolved; then add 3 mg lithium-based montmorillonite nanoparticles to the above solution, stir 1. Ultrasonic treatment to obtain a uniform suspension, adjust the pH of the solution to 1.2; then transfer to a reaction kettle, dry at 160°C for 48 hours, and then wash with deionized water and ethanol for 3 times, dry and grind to obtain a tungsten oxide / lithium base Montmorillonite nanomaterials;

[0038] (2) Preparation of modified diaphragm: Mix tungsten oxide / lithium-based montmorillonite nanomaterials, super P, and LA133 according to the mass fraction of 65%, 30%, and 5%, and after ball milling, add deionized water / isopropanol (v / v=1:1) Adjust the viscosity of the slurry to 980 mPs s, stir to obtain a uniform slurry; then apply the above slurry to one side of the polyvinylidene fluoride diaphragm by roller coating, and dry at 60°C for ...

Embodiment 3

[0041] (1) Preparation of tungsten oxide / clay mineral nanomaterials: Add 4.5 mg of sodium tungstate to 15 mL of deionized water, stir, and sonicate until dissolved; then add 8.4 mg of attapulgite nanoparticles to the above solution, stir, sonicate Treat to obtain a uniform suspension, adjust the pH of the solution to 3; then transfer to a reaction kettle, dry at 200°C for 36 h, wash with deionized water and ethanol three times, dry and grind to obtain tungsten oxide / attapulgite nanomaterials;

[0042] (2) Preparation of diaphragm: Mix tungsten oxide / attapulgite nanomaterials, graphene, and LA133 at a mass fraction of 80%, 17%, and 3%, and after ball milling, add deionized water / isopropanol (v / v =1:1) Adjust the viscosity of the slurry to 1280 mPs s, stir to obtain a uniform slurry; then apply the above slurry on one side of the polyimide diaphragm by roller coating, and dry at 60°C for 24 h to obtain the oxidation Tungsten / attapulgite nanomaterial modified diaphragm. The thi...

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Abstract

The invention discloses a preparation method of a tungsten oxide / clay mineral nanomaterial modified diaphragm for a lithium-sulfur battery. The preparation method comprises the following steps of: mixing a tungsten oxide / clay mineral nanomaterial, a conductive agent and a binder, performing ball-milling the mixture, adding a solvent to adjust the viscosity of slurry to 700-1300 mPas, and performing uniform stirring to obtain slurry; applying the slurry on one side of a commercial diaphragm by adopting a roller coating method, and carrying out thermocuring to obtain the modified diaphragm. The tungsten oxide / clay mineral nano material has strong electrocatalytic activity and high adsorption performance, and can effectively accelerate the catalytic conversion reaction of polysulfide; the carbon material with high electron conductivity is beneficial to rapid transmission of electrons in the catalytic conversion process; the prepared modified diaphragm can effectively restrain the problems of low battery capacity, low active substance utilization, slow dynamics, relatively poor rate capability and cycle stability caused by shuttling of polysulfide in a lithium-sulfur battery, so that the electrochemical performance of the battery is remarkably improved.

Description

technical field [0001] The invention relates to a preparation method of a tungsten oxide / clay mineral nano-material modified separator used in a lithium-sulfur battery, and belongs to the technical field of lithium batteries. Background technique [0002] Lithium-sulfur batteries have high-quality energy density (2600 Wh kg −1 ) and high volumetric energy density (2800 Wh L −1 ), is regarded as one of the most promising high specific energy storage systems. However, problems such as soluble polysulfide shuttle severely restrict the development of high energy density lithium-sulfur batteries. A variety of strategies have been used to address the above scientific issues and have achieved remarkable progress, such as electrode design, separator modification, electrolyte additives, anode protection, and intercalation, etc. Compared with other strategies, separator modification has the advantages of being simple and efficient, not easy to increase battery volume and quality, a...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/431H01M50/449H01M10/052
CPCH01M50/403H01M50/431H01M50/449H01M10/052Y02E60/10
Inventor 张俊平杨燕飞李凌霄李步成魏晋飞
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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