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A kind of three-dimensional network gel polymer electrolyte material and its preparation method and application

A gel polymer and electrolyte material technology, applied in the field of three-dimensional network gel polymer electrolyte material and its preparation, can solve the problem of low room temperature ionic conductivity, achieve high Coulombic efficiency, short time consumption, and good repeatability Effect

Active Publication Date: 2019-10-29
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, polymer electrolyte materials still have the problem of low room temperature ionic conductivity.

Method used

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  • A kind of three-dimensional network gel polymer electrolyte material and its preparation method and application
  • A kind of three-dimensional network gel polymer electrolyte material and its preparation method and application
  • A kind of three-dimensional network gel polymer electrolyte material and its preparation method and application

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preparation example Construction

[0029] The invention provides a preparation method of a three-dimensional network gel polymer electrolyte material, comprising the following steps:

[0030] (1) mixing polyvinylidene fluoride-hexafluoropropylene with N,N-dimethylformamide to obtain a polyvinylidene fluoride-hexafluoropropylene solution;

[0031] (2) The polyvinylidene fluoride-hexafluoropropylene solution obtained in the step (1), pentaerythritol tetra-3-mercapto propionate, diethylene glycol divinyl ether and photoinitiator are mixed to obtain a polymer precursor solution;

[0032] (3) Coating the polymer precursor solution obtained in the step (2) on a glass plate for ultraviolet radiation polymerization to obtain a wet film;

[0033] (4) Vacuum drying the wet film obtained in the step (3) to obtain a three-dimensional network gel polymer electrolyte material.

[0034] The invention mixes polyvinylidene fluoride-hexafluoropropylene and N,N-dimethylformamide to obtain polyvinylidene fluoride-hexafluoropropy...

Embodiment 1

[0054] (1) Uniformly dissolve PVDF-HFP in DMF under magnetic stirring, the stirring time is not less than 6h, and the mass ratio of PVDF-HFP to DMF is 1 / 4.

[0055] (2) in the solution that step (1) obtains, add the two kinds of monomers of PETT and EO and photoinitiator 2-hydroxyl-2-methyl-1-phenyl-1-acetone that molar ratio is 1 / 2, continue Stir to dissolve until a clear, homogeneous solution forms. The stirring time is not less than 6h, the mass of the photoinitiator is 0.1wt% of the total mass of the two monomers, and the ratio of the total mass of the two monomers to the mass of PVDF-HFP is 1 / 1.

[0056] (3) Apply the solution obtained in step (2) on a glass plate with a spatula, and polymerize under ultraviolet light irradiation (300nm). The irradiation time is 30s.

[0057] (4) Vacuum-dry the wet film obtained in step (3) at 60° C. for 12 hours to obtain a three-dimensional network polymer electrolyte material.

[0058] (5) Transfer the three-dimensional network poly...

Embodiment 2

[0065] (1) Uniformly dissolve polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) in dimethylformamide (DMF) under magnetic stirring, the stirring time is not less than 6h, and the mass ratio of PVDF-HFP to DMF is 1 / 5.

[0066] (2) In the solution that step (1) obtains, add two kinds of monomers and light Initiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, continue stirring to dissolve until a transparent and uniform solution is formed. The stirring time is not less than 6h, the mass of the photoinitiator is 0.1wt% of the total mass of the two monomers, and the ratio of the total mass of the two monomers to the mass of PVDF-HFP is 1 / 2.

[0067] (3) Apply the solution obtained in step (2) on a glass plate with a scraper, and polymerize under ultraviolet light irradiation. The irradiation time is 30s.

[0068] (4) The wet film obtained in step (3) was vacuum-dried at 60° C. for 12 hours to obtain a three-dimensional network polymer electrolyte dry film.

[0069] (5) Transf...

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Abstract

The invention provides a preparation method of a three-dimensional network gel polymer electrolyte material, and belongs to the field of an electrolyte material. PVDF-HFP and PETT-EO are mixed, a chain segment which is originally arranged in order of the PVDF-HFP is broken, the crystallinity is reduced, more ion conductive passages are generated, and the electrical conductivity is improved; the three-dimensional network gel polymer electrolyte material is prepared by the low-crystallinity PVDF-HFP and the PETT-EO with favorable mechanical property, the gel polymer electrolyte material is simultaneously endowed with high electrical conductivity and favorable mechanical performance, a polymer which can have a remarkable blocking effect on a polysulfide is introduced into preparation of a solid-state electrolyte, the solid-state electrolyte can be used in the three-dimensional network gel polymer electrolyte material of a lithium-sulfur battery, electron donor groups in the PETTO-EO and the three-dimensional network-shaped structure have a certain suppression effect on shuttling of the polysulfide, and the lithium ion transfer numbers of the polymer electrolyte material are increased.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to a three-dimensional network gel polymer electrolyte material and its preparation method and application. Background technique [0002] Lithium-ion batteries have been widely used in rechargeable electronic devices, electric vehicles and other fields due to their relatively high energy density and cycle stability. However, the traditional lithium-ion battery energy storage system using lithium iron phosphate, lithium cobalt oxide, and ternary materials as the positive electrode has reached a bottleneck that is difficult to break through. n 2- Dissolution and shuttling between the positive and negative electrodes lead to a decrease in the utilization of the active material. Many studies start from the modification of positive electrode, negative electrode and electrolyte to improve the utilization rate of active materials. Among many modification methods, replacing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0082H01M2300/0085Y02E60/10
Inventor 涂江平夏妍梁言菲夏新辉王秀丽谷长栋
Owner SHANDONG IND TECH RES INST OF ZHEJIANG UNIV