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Gel polymer electrolyte composite membrane and preparation method and application thereof

A gel polymer and polymer technology, applied in the field of electrochemical energy, can solve the problems of high-rate batteries, limited range of product pore size change, and limited application, so as to improve the conductivity of lithium ions, promote uniform deposition of ions, The effect of long cycle life

Active Publication Date: 2020-09-15
江西省纳米技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although gel polymer electrolytes have excellent ion transport ability and electrode compatibility, there are still deficiencies that limit their further application in lithium batteries
First of all, the ionic conductivity of gel polymer electrolytes at room temperature often cannot meet the needs of high-rate batteries, and the migration number of lithium ions in gel polymer electrolytes is low, which easily causes the internal polarization and internal resistance of the battery to increase during cycling. and the growth of lithium anode dendrites
Secondly, the gel network formed after polymer swelling has poor mechanical strength, which is difficult to meet the process requirements of actual production, that is, battery assembly.
At present, the preparation process of the gel polymer base film, the solvent evaporation method is simple but takes a long time, the efficiency is low, and the volatilized solvent is not easy to recover, and it is easy to cause pollution; the precipitation phase inversion method is convenient and quick, but the phase separation process The environment and coagulation bath conditions are harsh, and the structure and performance of the product are easily affected by factors such as temperature, humidity, and time, and the results are not easy to control; the electrospinning method requires a high-voltage power supply, which consumes a lot of energy and is dangerous. Difficult to scale up, and the product pore size change range is limited

Method used

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  • Gel polymer electrolyte composite membrane and preparation method and application thereof
  • Gel polymer electrolyte composite membrane and preparation method and application thereof
  • Gel polymer electrolyte composite membrane and preparation method and application thereof

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preparation example Construction

[0038] An aspect of the embodiments of the present invention provides a method for preparing a gel polymer electrolyte composite membrane, which includes:

[0039] Provide polymer base film;

[0040] Forming a metal-organic framework material interface layer (MOF interface layer) on the side of the polymer-based membrane having a dense pore structure by using an interface in-situ polymerization method, thereby obtaining a polymer composite membrane;

[0041] And, the polymer composite membrane is contacted with a plasticizer to gel to form a gel polymer electrolyte composite membrane.

[0042] In some more specific embodiments, the preparation method includes:

[0043] dissolving the polymer in the first solvent to form a polymer solution, and then coating the polymer solution on the surface of the substrate and placing it on the surface of a cooler for freeze casting treatment for 10-90 seconds, and then immersing the freeze cast treated substrate in Carry out phase inversi...

Embodiment 1

[0102] Add 6g of PVDF-HFP to 34g of DMSO solvent, continue to stir and dissolve to form a uniform solution, pour the solution on a clean and smooth copper plate substrate of 10×10×0.1cm, and use a stainless steel spatula with a gap of 300μm to form a film. The substrate was directly placed on the upper surface of a copper cooler at -196°C for 10s. After the polymer solution was completely frozen and solidified, the substrate was soaked in an absolute ethanol coagulation bath at 15°C for 18 hours. The cured film (about 120 μm) was taken out and washed with absolute ethanol, and placed in a vacuum oven at 60° C. for 6 hours to obtain a PVDF-HFP base film.

Embodiment 2

[0104] Add 2g of PVDF to 8g of DMSO:DMAC=1:1 solvent, continue to stir and dissolve at 60°C to form a homogeneous solution, pour the solution on a clean and smooth glass substrate of 10×10×0.1cm, and use a 200μm gap A stainless steel scraper coats the film. One side of the substrate first contacts the upper surface of the copper cooler soaked in a liquid nitrogen bath (-196° C.), and continues to advance at a certain speed until it is completely in contact with the surface of the copper cooler for 40 seconds. After the polymer solution is completely frozen and solidified, soak the substrate in a pure water coagulation bath at 0°C for 12 hours. The cured film (about 90 μm) was taken out and washed with absolute ethanol, and placed in a vacuum oven at 60°C for 6 hours to obtain a PVDF base film (polymer base film, such as Figure 4b shown). The SEM images of the cross-sectional structure and parallel channel structure of the PVDF base film are as follows: Figure 5a , 5b sho...

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Abstract

The invention discloses a gel polymer electrolyte composite membrane and a preparation method and application thereof. The preparation method of the gel polymer electrolyte composite membrane comprises the following steps of: forming a metal organic framework material interface layer on one side, with a compact pore structure, of the polymer base membrane by adopting an interface in-situ polymerization method so as to obtain a polymer composite membrane; and carrying out contact gelatinization on the polymer composite membrane and a plasticizer to form the gel polymer electrolyte composite membrane. The invention provides a novel method for preparing a polymer base membrane by combining freeze casting and phase inversion, which is efficient, convenient and high in controllability; the gelpolymer electrolyte composite membrane prepared by the invention has excellent lithium ion transport capability; and meanwhile, compared with a traditional electrolyte battery, a metal lithium batterywith the gel polymer electrolyte composite membrane has more excellent specific capacity, longer cycle life and higher coulombic efficiency.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy, and relates to a gel polymer electrolyte composite membrane and its preparation method and application, in particular to a gel polymer electrolyte composite membrane with a Janus structure and its preparation method and application. Background technique [0002] In recent years, with the development of portable electronic devices and the popularity of new energy vehicles, the demand for energy storage devices with high energy density and high safety is becoming more and more urgent. The traditional lithium-ion battery with graphite as the negative electrode is difficult to meet the demand in terms of capacity, so the research on lithium metal battery has aroused the interest of researchers. Metal lithium has extremely high theoretical specific capacity and extremely low electrochemical potential, and the use of lithium metal anode can effectively increase the energy density of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/28C08G83/00H01M10/052H01M10/0565H01M10/058C08L27/16C08L33/20C08L79/08C08L33/12C08L75/04
CPCC08J9/405C08J9/28H01M10/0565H01M10/052H01M10/058C08G83/008H01M2300/0082H01M2300/0085C08J2487/00C08J2327/16C08J2333/20C08J2379/08C08J2333/12C08J2375/04C08J2201/0482Y02E60/10Y02P70/50
Inventor 刘美男李麟阁张越张永毅李清文
Owner 江西省纳米技术研究院
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