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Porous gel electrolyte and preparation method and application thereof

A gel electrolyte and electrolyte technology, applied in the field of polymers, can solve problems such as carbon emissions, and achieve the effects of increased energy density, high electrolyte absorption, and adjustable porosity

Active Publication Date: 2022-05-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Common polymer materials used for gels, such as polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), polyethylene oxide (PEO), and polyacrylonitrile (PAN), are mostly extracted from fossil fuels, As non-renewable resources, their preparation and degradation have caused a large amount of carbon emissions

Method used

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  • Porous gel electrolyte and preparation method and application thereof
  • Porous gel electrolyte and preparation method and application thereof
  • Porous gel electrolyte and preparation method and application thereof

Examples

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preparation example Construction

[0050] The invention provides a method for preparing a porous gel electrolyte, comprising the following steps:

[0051] S1. Add polylactic acid (PLA) to dichloromethane (DCM) and magnetically stir to obtain product A. Add polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) to N,N-dimethylformamide (DMF ) was magnetically stirred to obtain product B, and after fully dissolving, product B (PVDF-HFP solution) was added to product A (dichloromethane solution of PLA), and stirred again to obtain a uniform mixed solution (electrolyte slurry);

[0052] The mass of polylactic acid is 80% to 90% of the total mass of polyvinylidene fluoride-hexafluoropropylene and polylactic acid, and the mass of polyvinylidene fluoride-hexafluoropropylene is 80% to 90% of the total mass of polyvinylidene fluoride-hexafluoropropylene and polylactic acid. 10%~20%, the volume of dichloromethane is 30%~70% of the total volume of dichloromethane and N,N-dimethylformamide, the volume of N,N-dimethylformam...

Embodiment 1

[0063] (1) Weigh 0.58128 mg of polylactic acid (PLA), add it to 2.1 mL of dichloromethane (DCM), and stir magnetically at 500 rpm for 4 hours; weigh 0.14532 mg of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) mg, added to 0.9mL N,N-dimethylformamide (DMF), magnetically stirred at 500rpm for 4 hours;

[0064] (2) The solution of PVDF-HFP obtained in step 1 was added to the methylene chloride solution of PLA, and magnetically stirred at 600 rpm for 4 hours, allowing the two solutions to be fully mixed;

[0065] (3) Decoat the mixed solution obtained in step 2 on the polytetrafluoroethylene film with a 200 μm scraper, place it in a fume hood at room temperature for 2 hours to volatilize the dichloromethane to form a film; keep it in a vacuum oven at 60°C for 8 hours, volatilize DMF pore formation, named 30DMF-PLA@PV. The prepared electrolyte was soaked in electrolyte solution for 4 hours, and then packaged and assembled button-type and quasi-solid supercapacitors.

Embodiment 2

[0067] (1) Weigh 0.56304 mg of polylactic acid (PLA), add it to 1.8 mL of dichloromethane (DCM), and stir magnetically at 500 rpm for 4 hours; weigh 0.14076 mg of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) mg, added to 1.2mL N,N-dimethylformamide (DMF), magnetically stirred at 600rpm for 4 hours;

[0068] (2) The solution of PVDF-HFP obtained in step 1 was added to the methylene chloride solution of PLA, and magnetically stirred at 600 rpm for 4 hours, allowing the two solutions to be fully mixed;

[0069] (3) Decoat the mixed solution obtained in step 2 on the polytetrafluoroethylene film with a 200 μm scraper, place it in a fume hood at room temperature for 2 hours to volatilize the dichloromethane to form a film; keep it in a vacuum oven at 60°C for 8 hours, volatilize DMF pore formation, named 40DMF-PLA@PV. The prepared electrolyte was soaked in electrolyte solution for 4 hours, and then packaged and assembled button-type and quasi-solid supercapacitors.

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Abstract

The invention discloses a porous gel electrolyte as well as a preparation method and application thereof, a degradable material polylactic acid is used as a framework, a small amount of polyvinylidene fluoride-hexafluoropropylene is added as a modification layer to connect a loose PLA framework, and meanwhile, the use amount of a polylactic acid non-solvent N, N-dimethylformamide is regulated and controlled to prepare the porous gel electrolyte. The porosity-adjustable composite gel electrolyte is creatively manufactured, can stably exist in an acetonitrile-based electrolyte, has high porosity and high electrolyte absorptivity, and shows stable electrochemical performance when the composite gel electrolyte is assembled into a button type and flexible quasi-solid supercapacitor. The diaphragm has the prospect of replacing commercial diaphragms and large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of polymers, and in particular relates to a porous gel electrolyte and its preparation method and application. Background technique [0002] Considering the increasing demand for high power, safety and long-cycle performance in portable energy storage devices, researchers have devoted themselves to developing solid-state or quasi-solid-state supercapacitors to avoid the hazards caused by organic electrolyte leakage. Compared with solid electrolytes, gel polymer electrolytes have better interfacial contact with electrodes and higher ionic conductivities, and are designed to address the key issues of safety and poor interfaces in electrochemistry. [0003] A good gel electrolyte requires the ability to absorb a sufficient amount of liquid electrolyte to ensure electrochemical stability under high current and long cycles. Designing a porous structure is an effective and common strategy that can help gel electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G11/84C08J9/40C08J9/28C08J5/18C08L67/04C08L27/16
CPCH01G11/56H01G11/84C08J9/40C08J9/28C08J5/18C08L67/04C08L27/16Y02E60/13
Inventor 韩晓刚杨超白宇鸽李鸿杰陈韦蒙赵斌
Owner XI AN JIAOTONG UNIV
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