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Preparation and application of a gel polymer electrolyte

A gel polymer and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of low ionic conductivity and insufficient mechanical strength, and achieve high ionic conductivity and high ionic conductivity efficiency and interface stability, low cost effect

Active Publication Date: 2020-04-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional polymers are based on polyethylene oxide (PEO), polyvinylidene fluoride (PVDF), polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), etc., and these polymer batteries are chemically stable. Good performance and cycle life, but there are still problems such as low ionic conductivity at room temperature and insufficient mechanical strength

Method used

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  • Preparation and application of a gel polymer electrolyte
  • Preparation and application of a gel polymer electrolyte
  • Preparation and application of a gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) The temperature of the oil bath was kept at 40°C. P(VdF-HFP) and P(MEMA) with a mass ratio of 3:1 were added to a three-necked flask, and acetone and dimethylacetamide with a mass ratio of 7:3 were added ( DMAC) mixed solvent, mechanically continuously stirred for 1 h to fully dissolve it to obtain a gel polymer solution with a mass fraction of 16%, wherein the stirring speed was 400r / min.

[0039] (2) Put the polymer solution obtained in step (1) into the syringe of the propulsion device of the electrospinning machine, use the PE film as a support, and spin in an electrostatic field with a voltage of 18kV and a receiving distance of 20cm to obtain a bismuth The surface of the porous diaphragm coated with the same amount of polymer fibers was transferred to a vacuum drying oven at 60°C for 12 hours, and the thickness of the film was 45-50 μm.

[0040] (3) Process according to step (3) of Example 1.

[0041] (4) Process according to step (4) of Example 1.

Embodiment 2

[0043] (1) The temperature of the oil bath was kept at 40°C. P(VdF-HFP) and P(MEMA) with a mass ratio of 1:1 were added to a three-necked flask, and acetone and dimethylacetamide with a mass ratio of 7:3 were added ( DMAC) mixed solvent, mechanically continuously stirred for 1 h to fully dissolve it to obtain a gel polymer solution with a mass fraction of 16%, wherein the stirring speed was 300 r / min.

[0044] (2) Put the polymer solution obtained in step (1) into the syringe of the propulsion device of the electrospinning machine, use the PE film as a support, and spin in an electrostatic field with a voltage of 16kV and a receiving distance of 20cm to obtain a double The surface of the porous diaphragm coated with the same amount of polymer fibers was transferred to a vacuum drying oven at 60°C for 10 hours, and the thickness of the film was 45-50 μm.

[0045] (3) Process according to step (3) of Example 1.

[0046] (4) Process according to step (4) of Example 1.

Embodiment 3

[0048] (1) The oil bath was kept at a constant temperature of 40°C. P(VdF-HFP) and P(MEMA) with a mass ratio of 1:3 were added to a three-necked flask, and acetone and dimethylacetamide with a mass ratio of 7:3 were added ( DMAC) mixed solvent, mechanically continuously stirred for 1 h to fully dissolve it to obtain a gel polymer solution with a mass fraction of 16%, wherein the stirring speed was 300 r / min.

[0049] (2) Put the polymer solution obtained in step (1) into the syringe of the propulsion device of the electrospinning machine, use the PE film as a support, and spin in an electrostatic field with a voltage of 18kV and a receiving distance of 20cm to obtain a bismuth The surface of the porous diaphragm coated with the same amount of polymer fibers was transferred to a vacuum drying oven at 60°C for 12 hours, and the thickness of the film was 45-50 μm.

[0050] (3) Process according to step (3) of Example 1.

[0051] (4) Process according to step (4) of Example 1.

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Abstract

The invention belongs to the field of lithium-ion battery and in particular discloses preparation and application of gel polymer electrolyte. A preparation method comprises the following steps: firstly, dissolving poly(vinylidenefluoride-hexafluoropropylene) and a methyl vinyl ether-maleic anhydride copolymer in a solvent; then transferring into an injection device of an electrostatic spinning machine; taking a polyethylene membrane as a support and carrying out electrostatic spinning to obtain a uniformly-staggered fiber membrane; immersing the obtained fiber membrane in an electrolyte solution to form the gel polymer electrolyte. The gel polymer electrolyte obtained by the invention sufficiently integrates advantages of the poly(vinylidenefluoride-hexafluoropropylene) and the methyl vinyl ether-maleic anhydride copolymer and has extremely good liquid absorption performance and liquid keeping capability; an electrochemical stability window is high and the safety performance is greatlyimproved. A production technology is simple and raw materials have no toxicity and no pollution; the invention provides the preparation method of the gel polymer electrolyte.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to the preparation and application of a gel polymer electrolyte blended with methyl vinyl ether-maleic anhydride copolymer. Background technique [0002] Since the concept of lead-acid battery was proposed, secondary batteries aiming at high specific energy, long life and safety have successively gone through the stages of lead-acid battery, nickel-chromium battery, nickel-metal hydride battery, and lithium-ion battery. Among all energy storage batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, small self-discharge, no memory effect, and environmental friendliness, so they are widely used in Bluetooth devices, as large as energy storage power stations, etc. Among power and energy storage devices, and developing at an unstoppable speed, it is a new type of green and environmentally friendly secondary battery with the best com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0085Y02E60/10
Inventor 李敏穗廖友好李伟善陈芳彬刘秋宇许嘉鑫
Owner SOUTH CHINA NORMAL UNIVERSITY
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