Preparation method of ZIF8/zinc oxide composite material for lithium-sulfur battery functional separation layer

A composite material and lithium-sulfur battery technology, applied in the field of material chemistry, can solve the problems of low utilization rate of positive electrode materials, impact on application, poor conductivity of intermediate products, etc., and achieve the effect of improving electrochemical stability

Active Publication Date: 2019-11-26
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor conductivity of elemental sulfur and the poor conductivity of the intermediate products in the charging and discharging process, and the shuttle effect of polysulfides in the reaction process have caused the utilization rate of positive electrode materials to remain at a low level, affecting its practical performance. application

Method used

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  • Preparation method of ZIF8/zinc oxide composite material for lithium-sulfur battery functional separation layer
  • Preparation method of ZIF8/zinc oxide composite material for lithium-sulfur battery functional separation layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of three-dimensional ordered polystyrene ball array materials:

[0023] First, slowly add 80mL of styrene monomer and 8mL of acrylic acid into 400mL of distilled water. After stirring and dispersing, use a water bath to heat the temperature of the reaction system to 60°C, and then pass nitrogen gas for 30min to remove the oxygen in the solution, and then add 15mL, 40mmol / L The aqueous solution of potassium persulfate was continuously reacted for 12 hours under the stirring condition of 300r / min. The resulting emulsion was separated in a centrifuge, washed with ethanol, and then dried naturally to obtain a polystyrene ball array material.

[0024] (2) Preparation of ZnO array material with inverse opal structure:

[0025] Prepare 100 mL of methanol solution of 0.5 mol / L zinc nitrate hexahydrate, stir well, add 2 g of hexamethyleneimine, ultrasonicate for 40 min, add 2 g of the polystyrene ball array material prepared in step (1), and let it stand for 2 h...

Embodiment 2

[0030] (1) Preparation of three-dimensional ordered polystyrene ball array material:

[0031] First, slowly add 50mL of styrene monomer and 5mL of acrylic acid into 300mL of distilled water. After stirring and dispersing, the temperature of the reaction system is raised to 50°C by heating in a water bath, and the oxygen in the solution is removed by passing nitrogen gas for 20 minutes. Potassium sulfate aqueous solution was continuously reacted for 10 h under the stirring condition of 200 r / min, and the obtained emulsion was separated in a centrifuge, washed with ethanol, and then dried naturally to obtain a polystyrene ball array material.

[0032] (2) Preparation of ZnO array material with inverse opal structure:

[0033] Prepare 100 mL of methanol solution of 0.1 mol / L zinc nitrate hexahydrate and stir evenly, add 1 g of hexamethyleneimine to it, sonicate for 30 min, then add 1 g of the polystyrene ball array prepared in step 1 to it, let stand 10h, and then dried by sucti...

Embodiment 3

[0038] (1) Preparation of three-dimensional ordered polystyrene ball array materials:

[0039] First, slowly add 100mL of styrene monomer and 10mL of acrylic acid into 500mL of distilled water. After stirring and dispersing, use a water bath to heat the temperature of the reaction system to 70°C, and then pass nitrogen gas for 40 minutes to remove oxygen in the solution, and then add 25mL, 50mmol / L The potassium persulfate aqueous solution was continuously reacted for 24 hours under the stirring condition of 300 r / min, and the obtained emulsion was separated in a centrifuge, washed with ethanol, and then dried naturally to obtain a polystyrene ball array material.

[0040] (2) Preparation of ZnO array material with inverse opal structure:

[0041] Prepare 100 mL of methanol solution of 1 mol / L zinc nitrate hexahydrate and stir evenly, add 3 g of hexamethyleneimine, ultrasonicate for 30-60 min, add 3 g of the polystyrene ball array material prepared in step (1) to it, and stati...

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Abstract

The invention relates to a preparation method of a ZIF8 / zinc oxide composite material for a lithium-sulfur battery functional separation layer. The method comprises the steps of firstly, preparing a three-dimensional ordered polystyrene sphere array material; secondly, preparing reverse opal-structure zinc oxide array material by the three-dimensional ordered polystyrene sphere array material; andfinally, growing a layer of ZIF8 on a surface of the zinc oxide array material to obtain the ZIF8 / zinc oxide composite material. The ZIF8 / zinc oxide composite material is coated on a surface of a basic film and is used as the lithium-sulfur battery functional separation layer, a shuttling effect of a polysulfide in preparation of a lithium-sulfur battery in the prior art can be effectively reduced, the utilization ratio of a positive electrode active substance is improved, and the integral performance of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to a preparation method of a ZIF8 / zinc oxide composite material as a functional interlayer of a lithium-sulfur battery, and belongs to the field of material chemistry. Background technique [0002] With the rapid development of science and technology and information industry, the demand for renewable energy and new energy is increasing in the world today. Lithium-ion batteries have the advantages of high specific energy, environmental friendliness and pollution-free, abundant resources, and low price, and have become the choice of energy storage devices such as mobile electronic products and electric vehicles. Using sulfur as the positive electrode material of the battery, its theoretical capacity can reach 1675mAh / g, and the theoretical energy density of the battery can reach 2600Wh / kg. Lithium-sulfur batteries are considered to be one of the most promising secondary batteries. However, the poor conductivity of elemental sulfur ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052
CPCH01M10/052H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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