Modified polymer electrolyte membrane, preparation method thereof and modified gel polymer electrolyte material

A technology of electrolyte membrane and polymer, which is applied in electrolytes, circuits, electrical components, etc., can solve the problems of poor electrochemical stability and ionic conductivity, which affect the application, and achieve good electrochemical stability, long cycle life, and ionic The effect of high transmission efficiency

Active Publication Date: 2018-09-28
SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical stability and ionic conductivity of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP)-based gel electrolytes are still poor, which affects its application in the lithium-ion battery industry.

Method used

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  • Modified polymer electrolyte membrane, preparation method thereof and modified gel polymer electrolyte material
  • Modified polymer electrolyte membrane, preparation method thereof and modified gel polymer electrolyte material
  • Modified polymer electrolyte membrane, preparation method thereof and modified gel polymer electrolyte material

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preparation example Construction

[0025] The invention provides a method for preparing a modified polymer electrolyte membrane, comprising the following steps:

[0026] After mixing polyvinylidene fluoride-hexafluoropropylene, polycarbonate lactone and polar organic solvent, ultrasonication and stirring are performed in sequence to obtain a polymer solution;

[0027] Casting the polymer solution into a film to obtain a modified polymer electrolyte wet film;

[0028] The modified polymer electrolyte wet membrane is dried to obtain a modified polymer electrolyte membrane.

[0029] In the invention, polyvinylidene fluoride-hexafluoropropylene, polycarbonate lactone and polar organic solvent are mixed, followed by ultrasonication and stirring in sequence to obtain a polymer solution. In the present invention, the number average molecular weight of the polyvinylidene fluoride-hexafluoropropylene is preferably 40000-60000, more preferably 50000; the number average molecular weight of the polycarbonate lactone is pr...

Embodiment 1

[0044] Dissolve 5 g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in 40 g of N,N-dimethylformamide (DMF), sonicate for 5 minutes, and stir magnetically for 12 hours at room temperature to obtain a solution of polyvinylidene fluoride-hexafluoropropylene ; Polypropylene carbonate (PPC) 5g was dissolved in polyvinylidene fluoride-hexafluoropropylene solution, ultrasonicated for 5 min, and magnetically stirred at room temperature for 12 hours to obtain a polymer solution;

[0045] Transfer the polymer solution into a clean Teflon mold (200mm×200mm), cast it naturally, and place it at room temperature for 30 minutes to stabilize the composite polymer system to obtain a modified polymer electrolyte wet film;

[0046] The obtained modified polymer electrolyte wet membrane was dried in a vacuum oven at 80° C. for 24 hours to obtain a modified polymer electrolyte membrane with a thickness of about 50 μm.

[0047] Using a scanning electron microscope to observe the modified ...

Embodiment 2

[0050] Dissolve 6 g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in 40 g of N,N-dimethylformamide (DMF), sonicate for 10 minutes, and magnetically stir for 12 hours at room temperature to obtain a solution of polyvinylidene fluoride-hexafluoropropylene ; Polypropylene carbonate (PPC) 4g was dissolved in polyvinylidene fluoride-hexafluoropropylene solution, sonicated for 10 minutes, and magnetically stirred at room temperature for 12 hours to obtain a polymer solution;

[0051] Transfer the polymer solution into a clean Teflon mold (200mm×200mm), cast it naturally, and place it at room temperature for 30 minutes to stabilize the composite polymer system to obtain a modified polymer electrolyte wet film;

[0052] The obtained modified polymer electrolyte wet membrane was dried in a vacuum oven at 80° C. for 24 hours to obtain a modified polymer electrolyte membrane with a thickness of about 20 μm.

[0053] The modified polymer electrolyte membrane was observed with ...

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Abstract

The invention provides a modified polymer electrolyte membrane, a preparation method thereof and a modified gel polymer electrolyte material. Polyvinylidene fluoride-hexafluoropropylene is modified bya blending method, so that polypropylene carbonate (PPC) is pasted onto a surface of a polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) matrix in a colloidal state by intermolecular interaction, the PPC and the PVDF-HFP matrix are permeated with each other, so that the purpose of introducing the PPC into the PVDF-HFP matrix is achieved; and the PPC contains C=O polar bonds, and the ion conductivity, the mechanical property and the electrochemical stability of the modified polymer electrolyte membrane are improved by the introduction of the polar bonds; and an electrolyte is absorbed bythe modified polymer electrolyte membrane provided by the invention to obtain a modified gel polymer electrolyte material, and the electrolyte material is high in transmission efficiency, long in cycle lifetime and good in electrochemical stability.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to a modified polymer electrolyte membrane, a preparation method thereof and a modified gel polymer electrolyte material. Background technique [0002] Lithium-ion batteries are considered to be one of the options for next-generation sustainable energy because of their high energy density and good cycle stability. Traditional lithium-ion batteries use liquid electrolytes. Liquid electrolytes have high conductivity and excellent electrode surface wettability, but their electrochemical performance and thermal stability are poor, and their safety is poor, which hinders their further development. Solid electrolytes have attracted extensive attention in recent years due to their high safety and stability. [0003] As a kind of solid electrolyte, gel electrolyte is composed of a polymer matrix and an electrolyte adsorbed on the polymer matrix. The polyvinylidene fluoride-h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0094Y02E60/10
Inventor 涂江平梁言菲夏新辉王秀丽谷长栋
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV
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