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Preparation method of PAALi-g-SiO2-doped nanofiber-based composite gel polymer electrolyte

A composite polymer and nanofiber technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, and final product manufacturing. It can solve problems such as electrolyte leakage, reduction, and poor contact between electrodes and electrolytes.

Inactive Publication Date: 2013-11-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, there is still leakage of the electrolyte due to phase separation between the polymer matrix and the absorbing electrolyte
Loss of electrolyte may further lead to poor contact between electrodes and electrolyte and decrease in ionic conductivity
All of the above limit the application of electrospun PVDF membranes in Li-ion batteries

Method used

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  • Preparation method of PAALi-g-SiO2-doped nanofiber-based composite gel polymer electrolyte
  • Preparation method of PAALi-g-SiO2-doped nanofiber-based composite gel polymer electrolyte
  • Preparation method of PAALi-g-SiO2-doped nanofiber-based composite gel polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) The specific surface area of ​​10g is 200m 2 / g gas phase SiO 2 Mix with 1g of γ-methacryloxypropyltrimethoxysilane and dissolve in ethanol solution, first magnetically stir for 2 hours, then ultrasonically disperse for 2 hours, add hydrochloric acid dropwise to make the pH of the system 3, and finally react at 75°C for 6 hours , SiO with γ-methacryloxypropyltrimethoxysilane coating modification on the surface was obtained by sol-gel dealcoholization reaction 2 Dispersion liquid, high-speed centrifugation and washing of the obtained dispersion liquid, repeated 3 times to remove by-products, baking in a vacuum oven at 100°C for 18 hours, and then grinding to obtain γ-methacryloxypropyltrimethoxysilane grafted coating Coated SiO 2 particles.

[0023] (2) 24g LiOH and 72g acrylic acid (AA) were reacted at room temperature for 4 hours to obtain lithium acrylate (AALi);

[0024] (3) 40g of lithium acrylate (AALi) and 10g of γ-methacryloxypropyltrimethoxysilane obtain...

Embodiment 2

[0032] (1) The specific surface area of ​​5g is 400m 2 / g gas phase SiO 2 Mix with 1g of γ-methacryloxypropyltrimethoxysilane and dissolve in ethanol solution, first magnetically stir for 1.5 hours, then ultrasonically disperse for 1.5 hours, add hydrochloric acid dropwise to make the pH of the system 2, and finally react at 85°C for 8 hours , SiO with γ-methacryloxypropyltrimethoxysilane coating modification on the surface was obtained by sol-gel dealcoholization reaction 2 Dispersion liquid, high-speed centrifugation and washing of the obtained dispersion liquid, repeated 3 times to remove by-products, baking in a vacuum oven at 110°C for 24 hours, and then grinding to obtain γ-methacryloxypropyltrimethoxysilane grafted coating Coated SiO 2 particles.

[0033] (2) 24g LiOH and 72g acrylic acid (AA) were reacted at room temperature for 2 hours to obtain lithium acrylate (AALi);

[0034] (3) 20g of lithium acrylate (AALi) and 10g of γ-methacryloxypropyltrimethoxysilane obt...

Embodiment 3

[0038] (1) The specific surface area of ​​10g is 300m 2 / g gas phase SiO 2 Mix with 10g of γ-methacryloxypropyltrimethoxysilane and dissolve in ethanol solution, first magnetically stir for 1 hour, then ultrasonically disperse for 1 hour, add hydrochloric acid dropwise to make the pH of the system 5, and finally react at 65°C for 4 hours , SiO with γ-methacryloxypropyltrimethoxysilane coating modification on the surface was obtained by sol-gel dealcoholization reaction 2 Dispersion liquid, high-speed centrifugation and washing of the obtained dispersion liquid, repeated 3 times to remove by-products, baking in a vacuum oven at 120°C for 12 hours, and then grinding to obtain γ-methacryloxypropyltrimethoxysilane grafted coating Coated SiO 2 particles.

[0039] (2) 24g LiOH and 72g acrylic acid (AA) were reacted at room temperature for 6 hours to obtain lithium acrylate (AALi);

[0040] (3) 60g of lithium acrylate (AALi) and 10g of SiO obtained in step (1) 2 The particles we...

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Abstract

The invention discloses a preparation method of PAALi-g-SiO2-doped nanofiber-based composite gel polymer electrolyte which is applied to a polymer lithium-ion battery. The method comprises the following steps of first preparing PAALi-g-SiO2, then mixing the PAALi-g-SiO2 with PVDF (polyvinylidene fluoride) according to a mass ratio of (1:2) to (1:6), then dispersing the mixture into a N'N-dimethylformamide / acetone (3:1) mixed solution, preparing a composite nanofiber polymer film by adopting an electrostatic spinning method, and adsorbing liquid electrolyte with the mass being 100(wt)% to 300(wt)% of that of the film after the film is dried so as to activate the film. The thickness range of the obtained composite nanofiber gel polymer electrolyte is 80micrometers to 100micrometers, the ion conductivity maximally can reach 3.26*10<-3>S cm<-1> at the temperature of 25 DEG C, and an electrochemical window can reach 5.0V. The preparation method has a good prospect in the field such as the polymer lithium-ion battery.

Description

technical field [0001] The invention relates to a doped PAALi-g-SiO applied to a polymer lithium ion battery 2 Preparation of Nanofiber-Based Composite Gel Polymer Electrolytes. Background technique [0002] Gel polymer electrolyte (GPE) is a type of polymer electrolyte that is similar to gel properties after adding a liquid plasticizer. It is composed of a polymer, metal lithium salt and plasticizer ternary components. It is a solid state, but its ion transport mainly occurs in the gel phase and its adsorbed liquid phase, and the transport mechanism is similar to that of liquid electrolytes. GPE does not leak liquid electrolyte, but also retains the characteristics of solid electrolyte, making it widely concerned in the application of energy storage devices such as lithium-ion batteries, solar cells, fuel cells, and capacitors. [0003] The polymer matrix used in GPE is cheap and easy to prepare materials, such as polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 李为立邢玉金杨刚
Owner JIANGSU UNIV OF SCI & TECH