Polymer gel electrolyte membrane, preparation method and sodium ion battery

A technology of gel electrolyte and polymer membrane, applied in electrolyte immobilization/gelation, secondary batteries, circuits, etc., can solve the problems of low porosity, low ionic conductivity, and poor high-temperature dimensional stability of polyolefin separators , to achieve good interfacial compatibility, high ionic conductivity and good mechanical stability

Inactive Publication Date: 2017-09-12
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cross-linked GPE supported by polyolefin microporous membrane exhibits sufficient mechanical properties, the polyolefin separator has low porosity, poor dimensional stability at high temperature, and low ionic conductivity.

Method used

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  • Polymer gel electrolyte membrane, preparation method and sodium ion battery
  • Polymer gel electrolyte membrane, preparation method and sodium ion battery
  • Polymer gel electrolyte membrane, preparation method and sodium ion battery

Examples

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preparation example Construction

[0037] see figure 1 , in one embodiment, a kind of preparation method of polymer gel electrolyte membrane, the polymer gel electrolyte membrane supported by this porous film is mainly used in sodium-ion battery, and it comprises the steps:

[0038] In step S1, a certain amount of polyethylene glycol diglycidyl ether, polyether amine and a solvent are mixed to obtain a precursor solution.

[0039] Specifically, polyethylene glycol diglycidyl ether and polyether amine are added into the solvent, stirred and mixed uniformly to obtain a colorless and transparent precursor solution.

[0040] The solvent is one of acetone, N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyrrolidone.

[0041]The mass percentages of the polyethylene glycol diglycidyl ether and the polyether amine in the solution are 1-3% and 2-6% respectively. The number average molecular weight of the polyethylene glycol diglycidyl ether is 500, 1000, 2000 or 6000 Da. The number average molecular weight of...

Embodiment 1

[0051] This embodiment relates to a preparation method of a polymer gel electrolyte membrane supported by a porous film, the method comprising the following steps:

[0052] (1) Add 4.0g of N,N-dimethylformamide into a 25ml beaker, then weigh 0.4g of polyethylene glycol diglycidyl ether (Mn=500) and 0.88g of polyetheramine (Mn=2000 ) into the beaker, stirred for 2h to mix well. Put the porous film into a clean polytetrafluoroethylene mold and pour the above solution, and after standing for a period of time, place it in a constant temperature blast oven for ring-opening polymerization at a constant temperature of 80°C for 24 hours to obtain a polymer supported by a heat-cured porous film membrane;

[0053] (2) The polymer film supported by the prepared porous film was washed three times with absolute ethanol to remove residual monomers and solvents contained in the film, and then the polymer film was placed in a vacuum oven at 60° C. for 12 h, and then moved to In the glove bo...

Embodiment 2

[0066] This embodiment relates to a preparation method of a polymer gel electrolyte membrane supported by a porous film, the method comprising the following steps:

[0067] (1) Add 0.2g polyethylene glycol diglycidyl ether (Mn=500) and 0.4g polyetheramine (Mn=2000) into a 25ml beaker, stir for 2h and mix well. And put the polyimide film in a clean polytetrafluoroethylene mold, pour the above solution, and after standing for a period of time, place it in a constant temperature blast oven and perform ring-opening polymerization at a constant temperature of 80°C for 24 hours to obtain a heat-cured porous film. Thin-film supported polymer membranes;

[0068] (2) The polymer film supported by the prepared porous film was washed three times with absolute ethanol to remove residual monomers and solvents contained in the film, and then the polymer film was placed in a vacuum oven at 60° C. for 12 h, and then moved to In the glove box, in the liquid electrolyte of 1.0M sodium hexafluo...

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Abstract

The invention discloses a preparation method of a polymer gel electrolyte membrane. The preparation method includes following steps: S1, mixing polyethylene glycol diglycidyl ether, polyether amine and solvent to obtain a precursor solution; S2, applying the precursor solution on a porous thin film, and heating for reaction to obtain a polymer membrane supported by the porous thin film; S3, soaking the polymer membrane in liquid-state electrolyte to adsorb the same to obtain the polymer gel electrolyte membrane supported by the porous thin film. The polymer gel electrolyte membrane is high in mechanical stability, ion conductivity and compatibility with a metal sodium interface. The invention further provides the polymer gel electrolyte membrane prepared by the method and a sodium secondary battery using the polymer gel electrolyte membrane.

Description

technical field [0001] The invention relates to materials for sodium secondary batteries, in particular to a polymer gel electrolyte membrane, a preparation method and a sodium ion battery. Background technique [0002] Among the currently developed energy storage devices, lithium-ion batteries are playing an increasingly important role in portable devices such as mobile phones and laptops, as well as vehicles such as electric bicycles and electric vehicles. The amount of lithium-ion batteries is increasing year by year. In particular, it needs to be pointed out that a considerable proportion of lithium-containing precursors are required for the synthesis of positive electrode materials, and lithium resources are very limited. With the rapid expansion of the application range of lithium-ion batteries, lithium salts will inevitably appear. A situation of short supply. It can be expected that the cost of lithium-ion battery raw materials is difficult to be greatly reduced, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/054
CPCH01M10/054H01M10/0565H01M2300/0085Y02E60/10
Inventor 李宝华卢青文余启鹏贺艳兵杨全红康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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