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Preparation method and application of MOF material PVDF-HFP gel electrolyte

A PVDF-HFP, gel electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, nanotechnology for materials and surface science, etc., can solve problems such as battery penetration, short circuit, and reduction of polymer crystallinity , to achieve the effect of improving electrical conductivity, simplifying the process flow, and inhibiting production

Active Publication Date: 2021-06-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, it solves the problem that it is easily penetrated by lithium dendrites and causes short circuit of the battery. MOF materials can reduce the crystallinity of polymers, improve the safety of batteries, and can inhibit the shuttle of polysulfides, which has great research value and commercial value

Method used

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  • Preparation method and application of MOF material PVDF-HFP gel electrolyte
  • Preparation method and application of MOF material PVDF-HFP gel electrolyte
  • Preparation method and application of MOF material PVDF-HFP gel electrolyte

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Embodiment 1

[0034] A preparation method of MOF material PVDF-HFP gel electrolyte, comprising the following steps:

[0035] Step 1. Dissolve 1.1785g of zinc nitrate in 25mL of anhydrous methanol to obtain A solution; then dissolve 0.536g of 2-methylimidazole in 25mL of anhydrous methanol to obtain B solution; Add it dropwise into solution B, and seal the resulting solution tightly with plastic wrap after completion; stir the solution on a magnetic stirrer for 12 hours, then take it off; after the solution stands at room temperature for 24 hours, filter the solution through a vacuum filter, and wash it with anhydrous methanol Washing three times; then drying in a vacuum oven at 70°C to obtain nanometer ZIF-8 material.

[0036] Step 2, adding 0.05g nanometer ZIF-8 material into 40mL of N,N-dimethylformamide (DMF), ultrasonic and stirring to form a homogeneous suspension, then adding polyvinylidene fluoride-hexafluoropropylene ( PVDF-HFP) powder, and stirred under heating in an oil bath at 8...

Embodiment 2

[0042] A preparation method of MOF material PVDF-HFP gel electrolyte, comprising the following steps:

[0043]Step 1. Dissolve 1.666g of zinc nitrate and 0.334g of terephthalic acid in 30mL of N-methylpyrrolidone, and ultrasonically disperse for 30min. Then pour the clear solution into a hydrothermal reaction kettle, and react in a constant temperature drying oven for 12 hours at a reaction temperature of 120°C. After the reaction was completed, the hydrothermal reactor was cooled naturally. Finally, rinse with N-methylpyrrolidone 3 times, each time 15 mL, to remove unreacted reactants in the product, and then rinse and soak with dichloromethane. Then the product was vacuum-dried at 70°C for 12 hours to obtain the nano-MOF-5 material.

[0044] Step 2. Add 0.05g of nano-MOF-5 material into 40mL of N-methylpyrrolidone, ultrasonically and stir to form a homogeneous suspension, then add polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) powder, and Stirring under heating in...

Embodiment 3

[0050] A preparation method of MOF material PVDF-HFP gel electrolyte, comprising the following steps:

[0051] Step 1. Dissolve 0.96g of cobalt nitrate in 25mL of anhydrous methanol to obtain solution A; then dissolve 1.848g of 2-methylimidazole in 25mL of anhydrous methanol to obtain solution B; Add it dropwise into solution B, and seal the resulting solution tightly with plastic wrap after completion; stir the solution on a magnetic stirrer for 12 hours, then take it off; after the solution stands at room temperature for 24 hours, filter the solution through a vacuum filter, and wash it with anhydrous methanol Washing three times; then drying in a vacuum oven at 70°C to obtain nanometer ZIF-67 material.

[0052] Step 2. Add 0.05g of nano-ZIF-67 material to 40mL of acetone, ultrasonically and stir to form a homogeneous suspension, then add polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) powder, and place in an 80°C oil bath Stirring under heating, ZIF-67 / PVDF-HFP is s...

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Abstract

The invention relates to a preparation method of an MOF material PVDF-HFP gel electrolyte, and belongs to the technical field of lithium-sulfur batteries. According to the prepared MOF material PVDF-HFP gel electrolyte, firstly, a nano MOF material is used as an additive, and an electrostatic spinning method is adopted to prepare an MOF material PVDF-HFP nanofiber membrane; and after the MOF material PVDF-HFP nanofiber membrane is soaked in a lithium-sulfur electrolyte for a period of time, a redundant electrolyte is absorbed, and the MOF material PVDF-HFP gel electrolyte is prepared. The MOF material PVDF-HFP gel electrolyte obtained by the invention has excellent ionic conductivity and lithium / electrolyte interface stability. The gel electrolyte also has relatively good cycling stability and a relatively high capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method and application of a MOF material PVDF-HFP gel electrolyte. Background technique [0002] Lithium-sulfur batteries have high theoretical specific capacity and energy density, low cost, long life, and good safety, and are recognized as the most promising next-generation sustainable energy. Lithium-sulfur batteries based on liquid electrolytes have disadvantages such as easy leakage and volatilization of solvents, unstable battery performance, and short service life. In addition, since it requires a large amount of electrolyte to ensure its cycle life, the overall energy density of the battery is severely restricted. The role of solid electrolytes in inhibiting polysulfides in lithium-sulfur battery systems is obvious, which can greatly improve the safety performance of batteries, but the ionic conductivity of solid electrolytes at...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/052H01M10/42D01F6/48D01F1/10B82Y30/00B82Y40/00
CPCH01M10/0565H01M10/058H01M10/052H01M10/4235D01F6/48D01F1/10B82Y30/00B82Y40/00Y02P70/50
Inventor 肖集升吴孟强周海平宋尧琛冯婷婷
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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