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Organic-inorganic-ionic liquid composite solid electrolyte, preparation method and application thereof

A solid electrolyte, ionic liquid technology, applied in solid electrolytes, hybrid capacitor electrolytes, non-aqueous electrolytes, etc., can solve the problems of low ionic conductivity of polymer electrolytes, poor mechanical properties of polymer electrolyte membranes, and uneven dispersion of inorganic particles. , to achieve the effect of improving electrochemical performance, conducive to transmission, and good mechanical properties

Active Publication Date: 2020-06-09
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) The ionic conductivity of the polymer electrolyte is low;
[0007] (2) The mechanical properties of the polymer electrolyte membrane are poor;
[0008] (3) The interface impedance between the polymer electrolyte membrane and the electrode is large;
[0009] (4) The emergence of lithium dendrites pierces the electrolyte membrane and causes a short circuit;
[0010] (5) Inorganic particles are unevenly dispersed in the electrolyte membrane;
[0011] (6) Plasticizers contain flammable components and are unsafe

Method used

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  • Organic-inorganic-ionic liquid composite solid electrolyte, preparation method and application thereof
  • Organic-inorganic-ionic liquid composite solid electrolyte, preparation method and application thereof
  • Organic-inorganic-ionic liquid composite solid electrolyte, preparation method and application thereof

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[0038] One aspect of the embodiments of the present invention provides a method for preparing an organic-inorganic-ionic liquid composite solid electrolyte, which includes:

[0039] Provide a uniform mixed reaction system comprising polymer monomers, inorganic nanoparticles, lithium salts, ionic liquids and initiators, wherein the polymer monomers, inorganic nanoparticles and ionic liquids all have reactive vinyl functional groups;

[0040] Lighting or heating the uniformly mixed reaction system allows polymer monomers, inorganic nanoparticles and ionic liquids in the uniformly mixed reaction system to undergo in-situ polymerization to obtain an organic-inorganic-ionic liquid composite solid electrolyte.

[0041] In some preferred embodiments, the preparation method specifically includes:

[0042] (1) uniformly mixing the lithium salt with the ionic liquid to obtain a lithium salt solution;

[0043] (2) uniformly mixing polymer monomers, inorganic nanoparticles and a solvent ...

Embodiment 1

[0078] LiFSI: 0.4g, ionic liquid: 1-vinyl-3-ethylimidazolium hexafluorophosphate: 1.6g, stir while heating at 60°C to obtain lithium salt solution and cool to room temperature, polyethylene glycol diacrylate- 400: 0.5g, Tetramethyltetravinylcyclotetrasiloxane: 0.1g, the two were dissolved in 0.5mL of acetone, stirred evenly and added to the lithium salt solution, and the photoinitiator 2-hydroxyl-2 -Methyl-1-phenyl-1-propanone (HMPP) 5 μL, magnetically stirred evenly, scraped a 300 μm film on a glass plate, and irradiated with a UV lamp for 5 minutes to obtain an electrolyte membrane with a thickness of about 200 μm and an ionic conductivity of 2.5 ×10 -4 S cm -1 , The mechanical strength is 6.1MPa.

Embodiment 2

[0080] LiFSI: 0.4g, ionic liquid: 1-vinyl-3-ethylimidazolium hexafluorophosphate: 2.8g, stir while heating at 60°C to obtain lithium salt solution and cool to room temperature, polyethylene glycol diacrylate- 400: 0.4g, tetramethyltetravinylcyclotetrasiloxane: 0.4g, the two were dissolved in 0.5mL of acetone, stirred evenly and added to the lithium salt solution, and the photoinitiator 2-hydroxyl-2 -Methyl-1-phenyl-1-propanone (HMPP) 4 μL, magnetically stirred evenly, scrape-coated a 300 μm film on a glass plate, and irradiated with a UV lamp for 5 minutes to obtain an electrolyte membrane with a thickness of about 200 μm and an ionic conductivity of 1.4 ×10 -4 S cm -1 , The mechanical strength is 4.9MPa.

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Abstract

The invention discloses an organic-inorganic-ionic liquid composite solid electrolyte, a preparation method and application thereof. The preparation method comprises the following steps: providing a uniformly mixed reaction system containing a polymer monomer, inorganic nanoparticles, a lithium salt, an ionic liquid and an initiator, wherein the polymer monomer, the inorganic nanoparticles and theionic liquid all have reactive vinyl functional groups; and illuminating or heating the mixed reaction system, so that the polymer monomer, the inorganic nanoparticles and the ionic liquid are subjected to an in-situ polymerization reaction to obtain the organic-inorganic-ionic liquid composite solid electrolyte. According to the organic-inorganic-ionic liquid composite solid electrolyte disclosed by the invention, inorganic nanoparticles and an ionic liquid are uniformly dispersed in a polymer skeleton in a chemical bond manner, and the solid electrolyte has the advantages of low interface impedance, high ionic conductivity, good mechanical property and low electrode / electrolyte membrane interface impedance, can well inhibit the growth of lithium dendrites, and effectively improves the electrochemical performance of a battery.

Description

technical field [0001] The invention relates to a composite solid electrolyte, in particular to a method for preparing an organic-inorganic-ionic liquid composite solid electrolyte by an in-situ polymerization method and its application, and belongs to the technical field of electrolyte materials. Background technique [0002] Lithium-ion battery electrolyte is one of the important factors affecting the performance of lithium-ion batteries. Although the liquid electrolyte has high ionic conductivity, the toxic and flammable organic solvents in the liquid electrolyte are easy to leak, and are limited by extreme conditions such as high and low temperature, which seriously affects the safety performance of the battery. Compared with liquid electrolytes, polymer electrolytes have become one of the research focuses of solid electrolytes and solid-state batteries due to their light weight, difficulty in flowing, safety and no leakage, ability to increase the volume specific capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F230/02C08F220/14C08F230/08H01M10/0565H01G11/56
CPCC08F230/02H01G11/56H01M10/0565H01M2300/0082Y02E60/10
Inventor 许晶晶张凤蕊吴晓东卢威
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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