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Nano composite fiber-reinforced gel polymer electrolyte and preparation method thereof

A technology of nanocomposite fibers and gel polymers, applied in the manufacture of electrolyte batteries, organic electrolytes, non-aqueous electrolytes, etc., can solve the problems of battery cycle performance deterioration, achieve improved electrochemical performance and mechanical performance, low energy consumption, The effect of simple synthesis process

Inactive Publication Date: 2015-03-04
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic liquid-based electrolyte solution is directly adsorbed by the nanocomposite polymer fiber membrane, which can obtain a high room temperature ionic conductivity. Although it can solve the safety performance of the battery, the fiber membrane has interconnected micron-scale pores, and the nano-electrode material can penetrate Through the diaphragm, causing battery cycle performance to deteriorate

Method used

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  • Nano composite fiber-reinforced gel polymer electrolyte and preparation method thereof

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Effect test

Embodiment 1

[0032] (1) Preparation of electrospinning dope. Dissolve 10 g of PVDF powder in a mixed system of 20 g of N,N′-dimethylacetamide and 50 g of acetone, stir at 50°C to form a transparent solution, add 0.5 g of silica nanoparticles (average particle size 30 nm), 1 g of PMMA The monomer was ultrasonically stirred for 1 hour to obtain the electrospinning stock solution.

[0033] (2) Nanocomposite SiO 2 / PVDF-b-PMMA blend polymer fiber membrane preparation. Inject the spinning stock solution into the high-voltage electrospinning equipment, use aluminum foil as the receiving screen, and carry out electrospinning under the conditions of a voltage of 25kV, a spinning speed of 0.6 ml / min, and a distance from the spinneret to the receiving screen of 20cm. , the fiber filaments are superimposed into a film, and the thickness is controlled to be 60 μm; the fiber film is peeled off from the aluminum foil, placed in a vacuum oven at 80 ° C, and dried for 24 hours to obtain a nanocomposite ...

Embodiment 2

[0037] SiO in embodiment 1 2 Nanoparticles (average particle size 15 nm) replaced by Al 2 o 3 Nanoparticles (average particle size 30 nm), other conditions unchanged, prepared (Al 2 o 3 / PVDF-PMMA)-g-PMMA / Al 2 o 3 Nanocomposite Polymer Electrolytes. With 1.08×10 -3 Room temperature ionic conductivity in S / cm.

Embodiment 3

[0039] SiO in embodiment 1 2 Nanoparticles (average particle size 15 nm) replaced by TiO 2 Nanoparticles (average particle size 10 nm), other conditions unchanged, prepared (TiO 2 / PVDF-PMMA)-g-PMMA / TiO 2 Nanocomposite Polymer Electrolytes. With 1.57×10 -3 Room temperature ionic conductivity in S / cm.

[0040] The test and calculation formula description of the polymer electrolyte ionic conductivity: the polymer electrolyte membrane is sandwiched between two symmetrical stainless steel electrodes, sealed in a button cell, and the AC impedance test is carried out on the EG&G 273 electrochemical workstation, and the obtained Bulk resistance of polymer electrolyte R b into the formula k= d / ( S ? R b ), calculate the ionic conductivity k of the polymer electrolyte, where d is the thickness of the polymer electrolyte membrane, and S is the apparent area of ​​the stainless steel electrode.

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Abstract

The invention relates to a nano composite fiber-reinforced gel polymer electrolyte and a preparation method thereof. Nano composite polymer fibers are grafted with a cross-linked polymer which has good compatibility with an electrolyte liquid, and adsorbs an ionic liquid-base electrolyte liquid to form a gel polymer electrolyte membrane taking the nanometer composite fibers as the framework, wherein the gel polymer electrolyte membrane has the advantages that the high temperature stability is good, and 10<-3> S / cm order of magnitude room temperature ion electric conductivity and the liquid leakage ratio are low. The preparation method mainly sequentially comprises the four steps of dissolving PVDF and PMMA to obtain a spinning liquid, obtaining a nano composite SiO2 / PVDF-b-PMMA polymer blend fibrous membrane, obtaining a (SiO2 / PVDF-PMMA)-g-PMMA / SiO2 nano composite polymer membrane, and obtaining a nano composite fiber-reinforced gel polymer electrolyte. The preparation method does not need a radiation device to trigger or strong base treatment; the synthesis process is simple; the operation is convenient; the production technology process is short; the energy consumption is low; and the nano composite fiber-reinforced gel polymer electrolyte and the preparation method thereof are especially suitable for a power lithium-ion battery material and preparation thereof.

Description

technical field [0001] The invention relates to a power lithium ion battery material and a preparation method thereof, in particular to a nanocomposite fiber reinforced gel polymer electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density and have been widely used as mobile power sources for portable electronic and electrical equipment, and have also been initially applied in electric vehicles. However, the lithium-ion battery combustion and explosion accidents that often appear in the news have aroused people's great concern. In particular, when a large-capacity lithium-ion battery is charged and discharged at a high rate, the huge heat generated causes the carbonate-based organic solvent inside the battery to volatilize into a gas, which accumulates inside the battery, resulting in an increase in the internal pressure of the battery. In this case, the battery must release the organic compound gas through a p...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/0525H01M10/0565H01M2300/0025Y02E60/10Y02P70/50
Inventor 李朝晖杨辰璐雷钢铁肖启振
Owner XIANGTAN UNIV
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