Composite solid electrolyte and preparation method thereof

A solid electrolyte and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of reducing the crystallinity of PVDF polymers, affecting the film coating process, and low ionic conductivity at room temperature, achieving enhanced Effects of segment mobility, reduced crystallinity, and high room temperature ionic conductivity

Pending Publication Date: 2022-04-22
YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymers such as PEO and PVDF have high crystallinity at room temperature, and the difficulty of molecular chain movement leads to relatively low room temperature ionic conductivity of most polymers.
[0006] In addition, PVDF polymers will gel in an alkaline environment, and the viscous solution will lead to the aggregation of components in the film, which will affect the role of plasticizers and other substances in reducing the crystallinity of PVDF polymers, and at the same time make various substances The solution loses fluidity before it is evenly mixed, affecting the film coating process

Method used

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  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof
  • Composite solid electrolyte and preparation method thereof

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preparation example Construction

[0038] A method for preparing a composite solid electrolyte, comprising the following steps:

[0039] (1) Under the protective atmosphere of the glove box, weigh the plasticizer, dispersant, lithium salt, fine Li6.75La3Zr1.75Ta0.25O12 ceramic powder and PVDF polymer substrate and add them to the reagent bottle; add the organic solvent to the In the above reagent bottle, the mixed solution is obtained, and then sealant is used to seal the mouth of the reagent bottle;

[0040] (2) Use a magnetic stirrer to fully stir the above mixed solution to dissolve the solute and mix evenly to obtain a glue; after that, heat the obtained glue in a water bath;

[0041] (3) Cast the glue solution on the polytetrafluoroethylene plate, use a scraper to scrape it to an appropriate thickness, then place it in a vacuum oven for drying to obtain a composite solid electrolyte membrane, and finally cut the solid electrolyte membrane to a suitable size. Composite solid electrolyte membrane.

[0042]...

Embodiment 1

[0049] A composite solid electrolyte and a preparation method thereof, comprising the following steps:

[0050] (1) Under the protective atmosphere of the glove box, weigh 0.3005g succinonitrile, 0.0963g polyvinylpyrrolidone, 1.0116g lithium bistrifluoromethanesulfonimide, 0.3065g fine LLZTO ceramic powder and 3.0291g polyvinylidene fluoride Chlorotrifluoroethylene copolymer is added to the reagent bottle, wherein the ratio of VDF and CTFE is 88%:12%; 30ml N, N-dimethylformamide is added to the above reagent bottle to obtain a mixed solution, and then use a sealed Seal the mouth of the reagent bottle with glue;

[0051] (2) Use a magnetic stirrer to fully stir the above mixed solution to dissolve the solute and mix evenly to obtain a glue solution. The stirring time is 12 hours; after that, the obtained glue solution is heated in a water bath for 6 hours and the heating temperature is 60°C ;

[0052] (3) Cast the glue solution on a polytetrafluoroethylene board, use a scrape...

Embodiment 2

[0054] A composite solid electrolyte and a preparation method thereof, comprising the following steps:

[0055] (1) Under the protective atmosphere of the glove box, weigh 0.6044g succinonitrile, 0.0163g polyacrylamide, 1.5072g lithium perchlorate, 0.9017g fine LLZTO ceramic powder and 3.0531g polyvinylidene fluoride chlorotrifluoroethylene copolymer and add it into the reagent bottle, wherein the ratio of VDF and CTFE is 92%:8%; add 30ml N,N-dimethylformamide into the above reagent bottle to obtain a mixed solution, and then seal the reagent bottle with sealant mouth;

[0056] (2) Use a magnetic stirrer to fully stir the above mixed solution to dissolve the solute and mix evenly to obtain a glue solution. The stirring time is 6 hours; after that, the obtained glue solution is heated in a water bath for 3 hours and the heating temperature is 40°C. ;

[0057] (3) Cast the glue on the polytetrafluoroethylene board, use a scraper to scrape it to an appropriate thickness, then p...

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Abstract

The invention relates to a composite solid electrolyte and a preparation method thereof, the composite solid electrolyte is composed of fine Li6. 75La3Zr1. 75Ta0. 25O12 ceramic powder, a PVDF polymer substrate, a plasticizer, a dispersant and a lithium salt, after the fine Li6. 75La3Zr1. 75Ta0. 25O12 ceramic powder, the PVDF polymer substrate, the plasticizer, the dispersant and the lithium salt are fully stirred and dissolved in an organic solvent, the dispersant is attached to the surface of a PVDF polymer in a linear or planar manner, and the lithium salt is added into the PVDF polymer substrate. The plasticizer and the fine Li6. 75La3Zr1. 75Ta0. 25O12 ceramic powder are fully inserted into the PVDF polymer substrate, so that the PVDF polymer substrate and the plasticizer are promoted to be mixed to generate blending modification, and a point, line, surface and layer multi-dimensional mixed insertion system structure which takes the PVDF polymer substrate as a continuous phase and takes a dispersing agent and the plasticizer as dispersed phases and is arranged in a staggered manner is formed. The preparation method has the advantages that operation is easy, synthesis conditions are mild, large-scale production can be achieved, and the obtained composite electrolyte has good flexibility and high room-temperature ionic conductivity.

Description

Technical field: [0001] The invention relates to the field of preparation of solid electrolytes, in particular to a composite solid electrolyte and a preparation method thereof. Background technique: [0002] With the in-depth development of a new round of technological revolution and industrial transformation, smart electronic devices have attracted more and more attention, and smart bracelets, watches, mobile phones and other equipment have gradually developed into an indispensable part of daily life. At the same time, in order to meet people's ever-changing needs, electronic devices are developing in the direction of light weight, flexibility and portability. Therefore, as an important part of electronic equipment, energy storage devices need to have greater flexibility, be able to better adapt to different working environments, and meet the shape and structure of equipment. However, as an important energy storage device, traditional lithium-ion batteries cannot meet the...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058Y02P70/50
Inventor 徐自强罗斌方梓烜吴孟强
Owner YANGTZE DELTA REGION INST OF UNIV OF ELECTRONICS SCI & TECH OF CHINE HUZHOU
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