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Preparation method of functional diaphragm of lithium sulfur battery

A lithium-sulfur battery and functional technology, applied in the direction of lithium battery, electrolyte battery manufacturing, battery pack components, etc., can solve the problem of unable to suppress the shuttle effect, etc., to improve the selective permeability function of the separator, improve the density, and improve the Coulomb efficiency. Effect

Active Publication Date: 2016-04-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defect that the current lithium-sulfur battery diaphragm cannot suppress the shuttle effect, the purpose of the present invention is to provide a preparation method for a lithium-sulfur battery functional diaphragm. The battery diaphragm prepared by this method has the function of selective permeability of lithium ions, and can effectively improve the lithium-sulfur battery. Cycle Performance and Coulombic Efficiency of Sulfur Batteries

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  • Preparation method of functional diaphragm of lithium sulfur battery

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Embodiment 1

[0025] Example 1: Add 100mg of graphene oxide to 100mL of deionized water, and ultrasonically disperse for 0.5h, then continue to sonicate and slowly add 10g of lithium hydroxide, 8g of monochloroacetic acid, and finally ultrasonic for 5h to complete the graphene oxide carboxylation reaction. A carboxylated graphene oxide solution is obtained. The carboxylated graphene oxide solution was vacuum dried at 50°C. Mix 8g polyvinylidene fluoride, 8g sulfonated polyethersulfone, 0.004g polyvinylpyrrolidone, 0.004g sodium nitrate, 1g deionized water, 78g dimethylformamide and 1g carboxylated graphene oxide in an Erlenmeyer flask. , Aging at 70℃ for 48h, stirring at 70℃ for 12h, and standing at room temperature for 48h to defoam to obtain casting liquid. Pour the casting liquid on the glass plate and scrape it to make a wet film. After the wet film was pre-evaporated in the air for 5 seconds, it was quickly placed in the coagulation bath for 1 min to initially replace the solvent. The...

Embodiment 2

[0026] Example 2: Add 50 mg of graphene oxide to 100 mL of deionized water, and ultrasonically disperse for 2 hours, continue to sonicate and slowly add 3 g of lithium hydroxide, 2 g of monochloroacetic acid, and finally ultrasonic for 3 hours to complete the graphene oxide carboxylation reaction. Carboxylated graphene oxide solution. The carboxylated graphene oxide solution was vacuum dried at 20°C. Mix 8g polyvinylidene fluoride, 0.4g polyacrylic acid, 1g polyethylene glycol, 0.008g deionized water, 25g N-methylpyrrolidone, 25g dimethyl sulfoxide and 1.2g carboxylated graphene oxide in an Erlenmeyer flask It is uniform, matured at 70°C for 24h, stirred at 70°C for 36h, and allowed to stand at room temperature for 8h to defoam to obtain a casting solution. Pour the casting liquid on the glass plate and scrape it to make a wet film. After the wet film was pre-evaporated in the air for 10 minutes, it was quickly placed in a coagulation bath for 30 minutes to initially replace ...

Embodiment 3

[0027] Example 3: Add 0.5g of graphene oxide to 100mL of deionized water, ultrasonically disperse for 3h, continue to sonicate and slowly add 10g of lithium hydroxide, 5g of monochloroacetic acid, and finally ultrasonic for 1h to complete the carboxylation of graphene oxide. A carboxylated graphene oxide solution is obtained. The carboxylated graphene oxide solution was vacuum dried at 30°C. Mix 8g polyvinylidene fluoride, 5g polymethyl methacrylate, 0.3g polyvinylpyrrolidone, 1g deionized water, 67g dimethylacetamide and 0.75g carboxylated graphene oxide in an Erlenmeyer flask. Maturation at ℃ for 24h, stirring at 70℃ for 24h, and standing at room temperature for 12h to defoam to obtain casting liquid. Pour the casting liquid on the glass plate and scrape it to make a wet film. After the wet film was pre-evaporated in the air for 30 seconds, it was quickly placed in a coagulation bath for 20 minutes to initially replace the solvent. The coagulation bath was a deionized aqueo...

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Abstract

The invention discloses a preparation method of a functional diaphragm of a lithium sulfur battery. The preparation method comprises the following steps: dissolving oxidized graphene into deionized water, performing ultrasonic treatment to obtain an oxidized graphene solution, then adding lithium hydroxide and monochloro acetic acid into the oxidized graphene solution, and performing ultrasonic treatment to obtain a carboxylic oxidized graphene solution; mixing polyvinylidene fluoride, a lithium conducting polymer, a perforation additive, deionized water, a solvent for dissolving the polymer and the carboxylic oxidized graphene according to a ratio, curing and stirring at 70 DEG C, and stewing and defoaming at a normal temperature to obtain a membrane casting solution; scraping the membrane casting solution into a wet membrane; pre-steaming the wet membrane, putting the membrane into a mixed coagulating bath, and immersing in the deionized water to form a preliminary membrane; treating the preliminary membrane to obtain the functional diaphragm. According to the diaphragm of the lithium sulfur battery, the capacity retention ratio and the coulombic efficiency of the battery can be obviously improved; the density of a carboxyl group on the surface of the diaphragm can be obviously increased, thus enhancing the permselectivity function of the diaphragm.

Description

Technical field [0001] The invention relates to a method for preparing a lithium-sulfur battery diaphragm, and belongs to the field of lithium-sulfur battery materials. In particular, it relates to a method for preparing a lithium-sulfur battery separator by a wet method. Background technique [0002] Energy is an important pillar supporting the development of modern society, and an efficient energy storage system will bring huge changes to society. Batteries are one of the main ways to store energy. The replacement of batteries has brought huge changes to the renewable energy industry, the electronics industry and the electric vehicle industry. [0003] In commercial applications, lithium-ion batteries use lithium-containing metal oxides such as lithium iron phosphate, lithium cobalt oxide, and lithium manganate as the positive electrode. In recent years, the rapid development of electric vehicles and other industries has placed higher requirements on the energy density and safe...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/058H01M2/14H01M2/16H01M50/403
CPCH01M10/052H01M10/058H01M50/40H01M50/409H01M50/403H01M50/411Y02E60/10Y02P70/50
Inventor 刘久清吴秀锋
Owner CENT SOUTH UNIV
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