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Multifunctional thin film for energy storage device and preparation method thereof

A multifunctional, device technology, applied in electrical components, structural parts, battery pack components, etc., can solve the problems of poor electrolyte wettability, poor mechanical properties, insufficient porosity, etc., to avoid stacking or agglomeration, good magnification and The effect of cycle performance, good tensile strength and puncture resistance

Pending Publication Date: 2022-01-28
LUOYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages of flammability, poor mechanical properties, poor wettability of electrolyte, insufficient porosity, unsuitability for new energy storage devices and complicated preparation process of diaphragms used in existing energy storage devices, and provides an energy storage device. Multifunctional thin film and preparation method thereof

Method used

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  • Multifunctional thin film for energy storage device and preparation method thereof
  • Multifunctional thin film for energy storage device and preparation method thereof
  • Multifunctional thin film for energy storage device and preparation method thereof

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preparation example Construction

[0030] A method for preparing a multifunctional thin film for an energy storage device, comprising the steps of:

[0031] S1. Disperse the graphene-based material, the metal-organic framework material or the precursor of the metal-organic framework material in the solvent respectively to obtain the graphene-based material dispersion liquid, the metal-organic framework material dispersion liquid or the metal-organic framework material respectively The precursor dispersion of the material;

[0032] S2, mixing the graphene-based material dispersion obtained in S1 with the metal-organic framework material dispersion or the precursor dispersion of the metal-organic framework material to obtain a mixed system;

[0033] S3. Transfer the mixed system prepared in S2 to a flat substrate;

[0034] S4, removing the solvent to obtain a multifunctional thin film for energy storage devices.

[0035] The graphene-based material described in S1 is single-layer graphene oxide, few-layer graphen...

Embodiment 1

[0040] Weigh 20mg of single-layer graphene oxide, add distilled water and ultrasonically disperse for 1h to make a 2mg / ml solution, and obtain the graphene-based material as solution A; weigh 1.8g of 2-methylimidazole, dissolve it in 30ml of water, and this is solution B ; Weigh 1.2g of zinc nitrate and dissolve it in 20ml of water with stirring, this is solution C. Add solution B to solution A, first stir for 30 minutes, then sonicate for 30 minutes, finally add solution C, and continue stirring for 2 hours. The above mixed solution was filtered to remove the solvent, and the obtained filter membrane was vacuum-dried for 3 hours to finally obtain a composite film material with a thickness of 20 μm.

[0041] Using this thin film material as a separator (GO / Zn-MOFs), using commercial lithium iron phosphate as anode material, and lithium sheet as anode and counter electrode, a lithium-ion battery was assembled to evaluate its electrochemical performance, and compared with commer...

Embodiment 2

[0043] Weigh 100 mg of graphene oxide, modify the surface of graphene oxide with p-aminobenzoic acid by diazotization reaction, obtain the graphene oxide modified with benzoic acid, and disperse it into 50ml N, N-dimethylformamide by ultrasonic to obtain A solution of 2 mg / ml is solution A; 2 g of biphenyl dicarboxylic acid and copper nitrate 2.5 are stirred and dissolved in 50 ml of N,N-dimethylformamide, which is solution B. Add solution B to solution A, first stir for 20 min, then sonicate for 1 h, and finally stir for 4 h. The above mixed solution was scraped onto a flat substrate, heated at 150° C. for 5 hours, and the solvent was removed to obtain a composite film material with a thickness of 25 μm.

[0044] Using this thin film material as a separator (GO-COOH / Cu-MOFs), using sulfur / carbon as the positive electrode material, and lithium sheets as the negative and counter electrodes, a lithium-sulfur battery was assembled to evaluate its electrochemical performance, and ...

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Abstract

The invention relates to a multifunctional thin film for an energy storage device and a preparation method. The preparation method comprises the following steps: firstly, dispersing a graphene-based material, a metal-organic framework material or a precursor of the metal-organic framework material into a solvent respectively; obtaining a graphene-based material dispersion liquid, a metal-organic framework material dispersion liquid or a precursor dispersion liquid of the metal-organic framework material respectively; mixing the graphene-based material dispersion liquid with the metal-organic framework material dispersion liquid or the precursor dispersion liquid of the metal-organic framework material to obtain a mixed system; transferring the mixed system to a planar substrate; and removing the solvent to obtain the multifunctional film for the energy storage device. On the premise of ensuring good wettability, the prepared thin film also has good multiplying power and cycle performance, has good tensile strength and puncture resistance, is suitable for new energy storage devices, and overcomes the defects that a traditional thin film is poor in mechanical performance, poor in electrolyte wettability, complex in preparation process and the like.

Description

technical field [0001] The invention relates to the technical field of thin film materials, in particular to a multifunctional thin film used for energy storage devices and a preparation method thereof. Background technique [0002] Among the various components of the energy storage device, the diaphragm is an electronically insulating and ion-conducting film material with rich pores, which plays the role of isolating the positive and negative electrodes and preventing internal short circuits, and is an essential part of the energy storage device. The safety and electrochemical performance (especially the rate discharge performance) of energy storage devices are largely affected by the separator. At present, the most commonly used diaphragms for commercial lithium-ion batteries mainly include: polyethylene diaphragms, polypropylene diaphragms or polyethylene / polypropylene hybrid diaphragms. These diaphragms are based on traditional polymer materials and have the following di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/431C01B32/182
CPCH01M50/403H01M50/446H01M50/431C01B32/182Y02E60/10
Inventor 随东
Owner LUOYANG NORMAL UNIV
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