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Organic polymer enhanced graphene intercalation material for lithium-sulfur batteries

A technology of organic polymers and intercalation materials, which is applied in the field of chemical energy storage batteries, can solve the problems of polysulfide interception, difficulty in transfer, and limited mechanical strength of the film, so as to increase surface roughness, improve electrical conduction efficiency, and improve The effect of mechanical properties

Active Publication Date: 2017-12-15
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical strength of the membrane made by simple graphene oxide suction filtration is limited, and its pores are not enough to intercept polysulfides through steric hindrance, and it is difficult to transfer them from the filter membrane.

Method used

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  • Organic polymer enhanced graphene intercalation material for lithium-sulfur batteries
  • Organic polymer enhanced graphene intercalation material for lithium-sulfur batteries
  • Organic polymer enhanced graphene intercalation material for lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1. The dispersion containing 60mg graphene oxide (GO), that is, the concentration of graphene oxide is 3.3mg·mL -1 Pour 100mL of deionized water into 100mL of deionized water, stir for 1h and continue to sonicate for 0.5h to fully disperse GO and obtain a GO dispersion; add 80mL of Tris buffer and 15mg of dopamine hydrochloride solid powder to the GO dispersion successively, and continuously stir After 24 hours, the color of the solution turned black, and a PDA-crosslinked graphene solution was obtained; filter with a vacuum pump, add 15 mL of Tris buffer and 20 mL of deionized water, and then filter with a vacuum pump to obtain a filter membrane loaded with PG membrane.

[0050] Step 2. Add 1mg·mL -1 Add 15mL of PEI aqueous solution to the filter membrane loaded with PG membrane, and filter it with a vacuum pump until the surface of the membrane is basically dry, then add 15mL Tris buffer solution and 50mL deionized water, continue to pass through the filter membr...

Embodiment 2

[0055] Step 1. With embodiment 1 step 1.

[0056] Step 2. Mix 1.5mg·mL -1 Add 15mL of PEI aqueous solution to the filter membrane loaded with PG membrane, and filter it with a vacuum pump until the surface of the membrane is basically dry, then add 15mL Tris buffer solution and 50mL deionized water, continue to pass through the filter membrane sequentially, and use a vacuum pump to filter it. After the filtration was completed, the filter membrane was taken out, compacted with a glass plate, and then moved into an oven at 50° C. for 4 hours to dry to obtain a filter membrane loaded with PPG membrane.

[0057] Step 3. Fix the filter membrane loaded with PPG membrane with a glass plate, immerse it in 60℃, the concentration is 4mol L -1 hydriodic acid solution in 15mL for 20min, after the filter membrane is dissolved, the impurity-containing PPG membrane is taken out, soaked in 20mL acetone and 60mL deionized water for 8h to remove impurities, and after drying, the PPG film is o...

Embodiment 3

[0062] Step 1. With embodiment 1 step 1.

[0063] Step 2. Add 2mg mL -1 Add 15mL of PEI aqueous solution to the filter membrane loaded with PG membrane, and filter it with a vacuum pump until the surface of the membrane is basically dry, then add 20mL Tris buffer solution and 50mL deionized water, continue to pass through the filter membrane in turn, and use a vacuum pump to filter it. After the filtration was completed, the filter membrane was taken out, compacted with a glass plate, and then moved into an oven at 60° C. for 2 hours to dry to obtain a filter membrane loaded with PPG membrane.

[0064] Step 3. Fix the filter membrane loaded with PPG membrane with a glass plate, immerse it in 90℃, the concentration is 2mol L -1 hydriodic acid solution in 20mL for 40min, after the filter membrane is dissolved, the impurity-containing PPG membrane is taken out, soaked in 20mL acetone and 50mL deionized water for 8h to remove impurities, and after drying, a PPG film is obtained, ...

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Abstract

The invention relates to an organic polymer enhanced graphene intercalation material for lithium-sulfur batteries and belongs to the field of chemical energy storage batteries. A Tris buffer solution and dopamine hydrochloride are added to a GO (graphene oxide) dispersion solution, the mixture is stirred to turn black, suction filtration is performed, the Tris buffer solution and water are added, suction filtration is performed, and a filter membrane loaded with a PG membrane is obtained; a PEI (polyethylenimine) aqueous solution is added to the filter membrane, suction filtration is performed, the Tris buffer solution and water are added, suction filtration is performed, the filter membrane is taken out and dried, a filter membrane loaded with a PPG membrane is obtained; the filter membrane is immersed in a hydroiodic acid solution, after the filter membrane is dissolved, the PPG membrane containing impurities is taken out and soaked with acetone and water for impurity removal, drying is performed, and the intercalation material is obtained. The intercalation material has good mechanical strength, low porosity, functional group sites with specific adsorption capacity, extremely high surface action area and good conductivity and can effectively inhibit shuttling of polysulfide, improve the electrical conduction efficiency of pure sulfur electrodes and control capacity of diaphragms for polysulfide and effectively increase the battery energy density.

Description

technical field [0001] The invention relates to an organic polymer-reinforced graphene intercalation material for lithium-sulfur batteries. Specifically, the intercalation material has low porosity and high active adsorption sites, can effectively inhibit the shuttle of polysulfides, and belongs to chemical energy storage battery field. Background technique [0002] In today's increasingly serious environmental problems and the depletion of fossil energy, it is particularly important to develop a secondary battery system with high specific energy. Lithium-sulfur batteries have become one of the most promising next-generation electrochemical energy storage systems due to their high theoretical energy density and low environmental impact. However, due to the shuttle effect of polysulfides and the electrochemical inertness of sulfur electrodes, the poor cycle stability and low utilization of active materials seriously restrict their practical applications. To solve the above ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/052H01M50/403H01M50/411H01M50/431
CPCH01M10/052H01M50/403H01M50/411Y02E60/10
Inventor 苏岳锋赵双义李健卢赟包丽颖吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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