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A kind of gel polymer electrolyte membrane and its preparation method and application

A gel polymer, electrolyte separator technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problem of unsatisfactory electrochemical stability window, unsatisfactory ionic conductivity, and narrow applicable temperature range, etc. It can improve the ionic conductivity and electrochemical stability window, facilitate the promotion and application of industrialization, and achieve the effect of low cost.

Active Publication Date: 2018-12-04
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these matrices have some defects due to the use of the same monomer for polymerization: poor mechanical properties when the ionic conductivity is high, and low ionic conductivity when the mechanical strength is high
[0003] The Chinese invention patent with the application number 200710025612.6 discloses "a method for preparing a semi-interpenetrating network gel polymer electrolyte film", but the electrochemical stability window is still not ideal, only 4.6V (vs.Li / Li + ), the applicable temperature range is also narrow
The Chinese invention patent with the application number 200610043125.8 discloses "a method for preparing nano-silica / polymethyl methacrylate gel polymer electrolyte by one-step polymerization initiation". Although the mechanical strength is relatively ideal, the ionic conductivity is still not ideal. The highest is only 3.44×10 -4 S cm -1

Method used

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  • A kind of gel polymer electrolyte membrane and its preparation method and application
  • A kind of gel polymer electrolyte membrane and its preparation method and application
  • A kind of gel polymer electrolyte membrane and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) in N 2 Under the protection of protective atmosphere, add 1.48% emulsifier sodium lauryl sulfate into 68.86% deionized water, stir mechanically for 20 minutes to fully dissolve it, then add 29.51% monomer n-butyl methacrylate, propylene Nitrile and styrene (where the mass ratio of n-butyl methacrylate, acrylonitrile and styrene is 1:2:1), raise the temperature to 60°C, and stir mechanically for 20 minutes to make it evenly mixed. Then the stirrer speed was adjusted to 800r / min, and at the same time, 0.15% initiator sodium persulfate was slowly added dropwise with a constant pressure funnel, and the initiator was added in 30 minutes. After 8 hours of reaction, an egg white-like white emulsion was obtained, and the emulsion was poured into 3% Al 2 (SO 4 ) 3 Stir the solution in a beaker to break the emulsion (where Al 2 (SO 4 ) 3The solvent quality of the solution is equal to the total mass of the emulsion), and then repeatedly washed with deionized water and ab...

Embodiment 2

[0042] (1) Under the protection of Ar protective atmosphere, add 1% of emulsifier potassium lauryl sulfate to 72% deionized water, mechanically stir for 30 minutes to fully dissolve it, and then add 26.9% of monomeric methacrylic acid n-butyl ester, acrylonitrile and styrene (the mass ratio of n-butyl methacrylate, acrylonitrile and styrene is 1:1:1), raise the temperature to 55°C, stir mechanically for 20 minutes to make it evenly mixed . Then adjust the speed of the agitator to 900r / min, and slowly add 0.1% of the initiator potassium persulfate dropwise with a constant pressure funnel, and control the addition of the initiator within 30 minutes. After 8 hours of reaction, an egg white-like white emulsion was obtained, and the emulsion was poured into 2% Al 2 (SO 4 ) 3 Stir the solution in a beaker to break the emulsion (where Al 2 (SO 4 ) 3 The solvent quality of the solution is equal to the total mass of the emulsion), and then repeatedly washed with deionized water a...

Embodiment 3

[0047] (1) Under the protection of Ar protective atmosphere, add 4% emulsifier ammonium lauryl sulfate to 60% deionized water, stir it mechanically for 40 minutes to fully dissolve it, then add 35.6% monomeric methacrylic acid n-butyl ester, acrylonitrile and styrene (the mass ratio of n-butyl methacrylate, acrylonitrile and styrene is 2:1:4), raise the temperature to 65°C, stir mechanically for 40 minutes to make it evenly mixed . Then the stirrer speed was adjusted to 900r / min, and at the same time, 0.4% initiator ammonium persulfate was slowly added dropwise with a constant pressure funnel, and the initiator was controlled to be added within 30 minutes. After 10 hours of reaction, an egg white-like white emulsion was obtained, and the emulsion was poured into 5% Al 2 (SO 4 ) 3 Stir the solution in a beaker to break the emulsion (where Al 2 (SO 4 ) 3 The solvent quality of the solution is equal to the total mass of the emulsion), and then repeatedly washed with deioniz...

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Abstract

The invention belongs to the field of lithium ion batteries, and specifically discloses a gel polymer electrolyte membrane and a preparation method and an application thereof. The preparation method comprises the steps of: firstly, performing emulsion polymerization by a n-butyl methacrylate monomer, an acrylonitrile monomer and a styrene monomer of different proportions to obtain a copolymer; secondly, under an ultrasonic condition, dispersing a certain amount of nano particles in a solvent for a period of time, dissolving a polymer powder into the solvent to obtain a sticky gel, and then obtaining a gel polymer ceramic membrane through a phase-transfer method; and finally, soaking the membrane into electrolyte, then a gel polymer electrolyte is obtained. The gel polymer electrolyte provided by the invention is high in safety performance, strong in ability to absorb the electrolyte, and high in electrochemical stability window; after being assembled into a button cell, through a circulation of 150 weeks, 93% of an initial capacity can still be maintained. The preparation process of the invention is very simple and the raw materials are cheap and easily available; and the invention provides a gel electrolyte which can be directly used to a polymer lithium ion battery, which is convenient for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a gel polymer electrolyte diaphragm, a preparation method and application thereof. Background technique [0002] Compared with traditional batteries, secondary lithium-ion batteries have the advantages of long cycle life, high energy density, light volume, no memory effect, and environmental friendliness. In energy storage devices, and is developing rapidly at an unstoppable speed. However, in the current commercial lithium-ion batteries, a large part of them are liquid electrolytes using carbonate organic solvents. Although the liquid electrolyte has high lithium-ion conductivity, its physical characteristics such as low flash point, low vapor pressure, and flammability determine that lithium-ion batteries using liquid electrolytes have great safety hazards, especially in comparison used in harsh environments. Among many solutions, the perfect incarnation of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565B82Y30/00
CPCB82Y30/00H01M10/0565H01M2300/0085Y02E60/10
Inventor 廖友好黄伟源李伟善罗雪仪李冠杰何祖韵
Owner SOUTH CHINA NORMAL UNIVERSITY
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