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A core-shell structure inorganic composite material and its preparation and application

An inorganic composite material, core-shell structure technology, applied in nanotechnology, nanotechnology, electrical components and other directions for materials and surface science, can solve the problems of low conductivity of PEO-based polymer electrolytes, and achieve reduced crystallinity, The effect of accelerating the ion conduction rate and expanding the area

Active Publication Date: 2021-01-19
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides an all-solid-state composite electrolyte inorganic nano-filling material, a preparation method, a composite electrolyte membrane and a preparation method thereof, the purpose of which is to solve the problem of low conductivity of a PEO-based polymer electrolyte

Method used

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  • A core-shell structure inorganic composite material and its preparation and application
  • A core-shell structure inorganic composite material and its preparation and application
  • A core-shell structure inorganic composite material and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Take a 250mL Erlenmeyer flask, add 100mL of absolute ethanol and 4.16g of ethyl orthosilicate to it, and stir magnetically to form solution 1; take another 250mL Erlenmeyer flask, add 80mL of anhydrous Ethanol, 5.28g of deionized water and 7.7mL of concentrated ammonia water were magnetically stirred to form solution 2; solution 2 was slowly added to solution 1, magnetically stirred at 2000 rpm for 24 hours, and then stirred at 10000 rpm The white precipitate was separated by centrifugation, washed three times with absolute ethanol, and the obtained precipitate was dried at 60°C for 12 hours to obtain spherical SiO 2 Material.

[0039] Weigh 0.4g of SiO 2 materials, were added to 40mL of absolute ethanol, ultrasonicated for 30min to form a uniform suspension, and then 0.0441g LiNO was added to the solution 3 , 0.0503g Al(NO 3 ) 3 9H 2 O, 0.2586g tetrabutyl titanate and 0.1546g phosphoric acid, magnetically stirred to dissolve completely, then added 0.4481g EDTA and...

Embodiment 2

[0042] Take a 250mL Erlenmeyer flask, add 50mL of absolute ethanol and 4.16g of tetraethyl orthosilicate to it, and stir magnetically to form solution 1; take another 250mL Erlenmeyer flask, add 40mL of anhydrous Ethanol, 5.64g deionized water and 7.7mL concentrated ammonia water were magnetically stirred to form solution 2; solution 2 was slowly added to solution 1, magnetically stirred at 2000 rpm for 24 hours, and then stirred at 10000 rpm The white precipitate was separated by centrifugation, washed three times with absolute ethanol, and the obtained precipitate was dried at 60°C for 12 hours to obtain spherical SiO 2 Material.

[0043] Weigh 0.4g of SiO 2 materials, were added to 40mL of absolute ethanol, ultrasonicated for 30min to form a uniform suspension, and then 0.0441g LiNO was added to the solution 3 , 0.0503g Al(NO 3 ) 3 9H 2 O, 0.2586g tetrabutyl titanate and 0.1546g phosphoric acid, magnetically stirred to dissolve completely, then added 0.4481g EDTA and 0...

Embodiment 3

[0046] Add 0.6g of PEO and 0.2175g of LITFSI to 6mL of anhydrous acetonitrile solvent, stir magnetically, stir for 12h, let stand for 2h to form a uniform electrolyte slurry, pour the slurry into a polytetrafluoroethylene mold, and use The stainless steel blade was scraped flat, transferred to a vacuum drying oven, dried at 50°C for 24 hours, and cooled to room temperature to form a PEO / LITFSI solid lithium ion electrolyte membrane. The conductivity of the composite electrolyte was studied by AC impedance technology, and the specific measurement conditions were as follows: in an open circuit state, the test temperature was 25-95°C, and the frequency range was 10 6 Hz-1Hz, the interference voltage is 5mV. see test results Figure 6 , as the test temperature increases, the total resistance of the electrolyte membrane decreases gradually, because the movement of ions and polymer chains inside the electrolyte membrane accelerates. According to the conductivity calculation formula...

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Abstract

The invention discloses an inorganic composite material with a core-shell structure as well as preparation and application thereof, and particularly relates to the field of all-solid-state lithium ionbatteries. The preparation method comprises the steps of mixing an ethyl orthosilicate-ethanol solution with an ammonia water-ethanol-aqueous solution, and centrifuging and drying the generated precipitate to obtain a SiO2 material with a spherical structure; dispersing the synthesized SiO2 into an ethanol precursor solution of LATP, heating in a water bath to volatilize an ethanol solvent, and drying and calcining residues to form a composite material with a SiO2-LATP core-shell structure. SiO2-LATP, PEO and LITFSI are mixed according to a certain proportion to form electrolyte slurry, and aSiO2-LATP / PEO / LITFSI composite electrolyte membrane is formed after slurry film formation. The electrolyte membrane prepared from the small-size filling material is good in electrical property, and the room-temperature conductivity is 6.4*10<-6>S / cm and is about 2.5 times that of a PEO / LITFSI electrolyte.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium-ion batteries, in particular to a core-shell structure inorganic composite material and its preparation and application. Background technique [0002] Compared with liquid lithium-ion electrolytes, solid-state lithium-ion electrolytes have the advantages of no leakage and non-flammability. Using solid-state electrolytes instead of liquid electrolytes to develop all-solid-state batteries can fundamentally solve the safety problems of liquid lithium-ion batteries. Lay the foundation for the development of large-scale battery fields such as energy storage and large-scale energy storage. [0003] Solid-state electrolytes mainly include inorganic electrolytes and polymer electrolytes. The former has high conductivity, wide electrochemical window, and good thermal stability, but has poor plasticity, fragility, difficulty in assembling batteries, and poor interface contact between electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 赵二庆郭玉娣赵红远许光日张甲敏王磊
Owner HENAN INST OF SCI & TECH
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