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Method for preparing polymer electrolyte of flexible lithium-ion battery in situ and application

A lithium ion battery and a flexible preparation technology, which is applied in the field of lithium ion battery electrolyte materials, can solve the problems of cumbersome and complicated battery assembly procedures, low electrolyte liquid content, poor mechanical tolerance, etc., and achieves favorable migration and safety performance. Improve and enhance the effect of compatibility

Inactive Publication Date: 2018-02-02
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, polymer electrolytes for lithium-ion batteries are mainly filled with liquid electrolytes in the polymer substrate. The gel-type electrolytes prepared in this way have poor mechanical tolerance. At the same time, the electrolytes prepared by the direct compounding method contain less liquid and the liquid is easy to leak. The process from the preparation of the electrolyte to the assembly of the battery is cumbersome and complicated

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  • Method for preparing polymer electrolyte of flexible lithium-ion battery in situ and application
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  • Method for preparing polymer electrolyte of flexible lithium-ion battery in situ and application

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preparation example Construction

[0035] The present invention also provides a method for preparing a gel-type polymer electrolyte, which includes: (1) rectifying and purifying polymerized monomers (non-ionic liquid monomers, ionic liquid functionalized monomers, and cross-linking agents), Remove moisture and other impurities; (2) Dry the initiator and porous electrospun film in a vacuum oven at 40°C for 24 hours to remove moisture; (3) In an inert gas glove box; The ionic liquid monomer, crosslinking agent, thermal initiator, ionic liquid and lithium salt are stirred evenly to prepare a colorless and transparent precursor solution, wherein the concentration of lithium salt in the ionic liquid is 0.3~1M, and the thermal initiator is 0.5 ~5wt%, non-ionic liquid monomer and ionic liquid functionalized monomer: the mass ratio of crosslinking agent is 5:1, non-ionic liquid monomer: the molar ratio of ionic liquid functionalized monomer is 1:1~4, preferably 3:7. (5) Thermosetting the base film soaked with the prec...

Embodiment 1

[0042] (1) Preparation of electrospun membrane.

[0043] PVDF-HFP (M W =4×10 5 gmol -1 ) stirred to dissolve in V 丙酮 :V N-N二甲基甲酰胺 = 15% polymer solution with a mass fraction of 15% in a mixed solution of 3:1. Add the above polymer solution into a 5 mL syringe, use a syringe pump to propel the polymer solution, and set the injection rate to 1.2 mLh -1 , using a DC high-voltage generator as a device for a high-voltage electrostatic field, and a cylindrical drum as a receiving plate. The voltage is adjusted according to the concentration and viscosity of the polymer solution. The voltage is set to 18 kV, and the rotation speed of the drum is 500 r s -1 , the vertical distance from the roller to the needle tip is 15 cm. After spinning, place the film at 40 o C dried in a vacuum oven for 24 h to obtain the desired electrospun film.

[0044] Scanning electron microscopy (SEM) was used to analyze the morphology of the prepared PVDF-HFP electrospun membrane, the SEM image is a...

Embodiment 2

[0051] This example is used to illustrate the polymer electrolyte provided by the present invention and its preparation method.

[0052] (1) Preparation of electrospun membrane.

[0053] Polyethylene terephthalate (PET inherent viscosity= 0.8dl g -1 ), stirred to dissolve in V 三氟乙酸 : A polymer solution with a mass fraction of 10% is configured in a mixed solution of V dichloromethane=3:2. Add the above polymer solution into a 5 mL syringe, use a syringe pump to propel the polymer solution, and set the injection rate to 3 mLh -1 , using a DC high-voltage generator as a device for a high-voltage electrostatic field, and a cylindrical drum as a receiving plate. The voltage is adjusted according to the concentration and viscosity of the polymer solution. The voltage is set to 22 kV, and the rotation speed of the drum is 500 r s -1 , the vertical distance from the roller to the needle tip is 15 cm. After spinning, place the film at 40 o C dried in a vacuum oven for 24 h to obt...

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Abstract

The invention discloses a method for preparing a polymer electrolyte of a flexible lithium-ion battery in situ and an application. The method comprises the steps of firstly preparing a porous membraneof a polymer substrate from a polymer; stirring a functionalized ionic liquid monomer, a non-ionic liquid monomer, a cross-linking agent, a thermal initiator, an ionic liquid and a lithium salt evenly to prepare a colorless transparent precursor solution; immersing the porous membrane of the polymer substrate into the precursor solution, reacting the porous membrane of the polymer substrate immersed into the precursor solution in an inert atmosphere at 60-80 DEG C for 10-24h and forming the polymer electrolyte in situ. A secondary lithium-ion battery employing a gel polymer as the electrolytehas good chemical and electrochemical stability, and the safety performance is greatly improved. The preparation technology can be well simplified through in-situ crosslinking, the compatibility of the electrolyte and an electrode is improved, the interface impedance is reduced and the method is especially suitable for preparing thin batteries of various shapes.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to lithium ion battery electrolyte materials and batteries using the electrolyte. Background technique [0002] Lithium polymer secondary battery has the advantages of high specific energy, good safety performance and excellent processing performance, and has attracted widespread attention. Compared with traditional liquid lithium-ion batteries, polymer lithium secondary batteries not only maintain the advantages of high voltage, high specific energy, long cycle life, green environmental protection, and no memory effect, but also overcome the leakage of liquid lithium-ion batteries. Liquid, fire or even explosion and other safety issues. The shell of polymer lithium secondary battery can also be packaged with aluminum-plastic composite film, which is more flexible in design. Due to the light weight of the aluminum-plastic composite film, the polymer lithium secondary batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0566H01M10/0525H01M8/1016H01M8/1018
CPCH01M8/1016H01M8/1018H01M10/0525H01M10/0565H01M10/0566Y02E60/10Y02E60/50
Inventor 陈义旺袁凯谈利承阙明明
Owner NANCHANG UNIV
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