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Sponge substrate carrier gel polymer electrolyte and preparation method thereof

A gel polymer, matrix carrier technology, used in organic electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as poor mechanical properties, poor dimensional stability, and inability to form large-scale factory films. Inexpensive, solve the effect of poor mechanical properties

Inactive Publication Date: 2015-03-25
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to completely solve the fundamental problem that the gel polymer electrolyte membrane cannot be formed into a large-scale factory due to poor mechanical properties and poor dimensional stability, it provides feasibility for the development of gel polymer electrolyte lithium-ion battery products , the present invention uses sponge as matrix carrier to provide mechanical support to prepare gel polymer electrolyte

Method used

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  • Sponge substrate carrier gel polymer electrolyte and preparation method thereof
  • Sponge substrate carrier gel polymer electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) Polymethyl methacrylate is dissolved in acetone at room temperature, and stirred to obtain a uniform solution;

[0021] (2) Soak a dry sponge with a thickness of 120 μm in the obtained solution. After it absorbs the solution in a large amount, take it out with tweezers, and evaporate the solvent from the sponge to obtain a sponge matrix carrier polymethyl methacrylate compound , and then placed in a vacuum oven at 50°C to remove trace solvents;

[0022] (3) Immerse the obtained dry sponge matrix carrier polymethyl methacrylate compound in the glove box at a concentration of 1mol L -1 In the lithium perchlorate propylene carbonate liquid electrolyte, when it absorbs the maximum amount of liquid electrolyte and the polymer forms a gel, a sponge matrix carrier gel polymethyl methacrylate electrolyte is prepared, which is named system 1.

Embodiment 2

[0024] (1) Polyacrylonitrile is dissolved in acetone at room temperature, and stirred to obtain a uniform solution;

[0025] (2) Soak a dry sponge with a thickness of 250 μm in the obtained solution. After it absorbs the solution to the maximum, it is taken out with tweezers, and the solvent is volatilized from the sponge to obtain a sponge matrix carrier polyacrylonitrile composite, and then Place in a vacuum oven at 60°C to remove trace solvents;

[0026] (3) Immerse the obtained dry sponge matrix carrier polyacrylonitrile compound in the glove box at a concentration of 1mol L -1 In the lithium perchlorate dimethyl carbonate liquid electrolyte, when it absorbs the maximum amount of liquid electrolyte and the polymer forms a gel, a sponge matrix carrier gel polyacrylonitrile electrolyte is prepared, which is named system 2.

Embodiment 3

[0028] (1) Poly(methyl methacrylate-vinyl acetate) copolymer is dissolved in tetrahydrofuran at room temperature, and stirred to obtain a uniform solution;

[0029] (2) Soak a dry sponge with a thickness of 350 μm in the obtained solution. After it absorbs the solution in a large amount, it is taken out with tweezers, and the solvent is volatilized from the sponge to obtain a sponge matrix carrier poly(methyl methacrylate- Vinyl acetate) complex, and then placed in a vacuum oven at 70 ° C to remove trace solvents;

[0030] (3) Immerse the obtained dry sponge matrix carrier poly(methyl methacrylate-vinyl acetate) composite in the glove box at a concentration of 1mol L -1 In the lithium hexafluorophosphate dimethyl carbonate liquid electrolyte, when it absorbs the maximum amount of liquid electrolyte and the polymer forms a gel, a sponge matrix carrier gel poly(methyl methacrylate-vinyl acetate) electrolyte is prepared, which is named system 3.

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Abstract

The invention discloses a sponge substrate carrier gel polymer electrolyte and a preparation method thereof. The sponge substrate carrier gel polymer electrolyte is characterized in that sponge is a porous foaming material prepared by polyurethane with the hardness of 20 degrees to 40 degrees; a polymer is a homopolymer, a copolymer or a mixture of polyethers, polyacrylates, polyacrylonitriles, polyvinylidene fluorides, polyphosphazenes and polyvinyl acetates; and lithium salt and a plasticizer in the liquid electrolyte are one of or a mixture of two of lithium perchlorate and lithium hexafluorophosphate with different proportions and one of or mixed solution of a plurality of ethylene carbonate, propylene carbonate, dimethyl carbonate and diethyl carbonate. According to the process, the sponge firstly forms a compound with the polymer and then absorbs the liquid electrolyte to obtain the sponge substrate carrier gel polymer electrolyte. The sponge substrate carrier gel polymer electrolyte has the beneficial effects that the problem that the current gel polymer electrolyte cannot be subjected to industrialized large-sized film formation is solved, and new opportunity and possibility are provided for development of the electrolyte lithium ion battery products.

Description

technical field [0001] The invention relates to a sponge matrix gel polymer electrolyte for a lithium ion battery and a preparation method thereof. Background technique [0002] Gel polymer electrolytes for lithium-ion batteries have both the high ionic conductivity of liquid electrolytes and the safety and stability of solid polymer electrolytes, which is an important direction and guarantee for further improving the performance of lithium-ion batteries. However, gel polymer electrolytes cannot be used in lithium-ion battery products at present, because the mechanical properties and dimensional stability of gel polymer electrolyte membranes have never met the factory production requirements for large-area film formation. Therefore, research on the preparation of gel polymer electrolytes with good mechanical properties and dimensional stability is the most urgent problem in this field. Currently, the most common solution is to add various inorganic nanofillers, such as clay...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0025Y02E60/10
Inventor 黄韵龚胜东杨满林元华陈肖李洋李星
Owner SOUTHWEST PETROLEUM UNIV
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