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Preparation method for boron-doped graphene-modified gel polymer electrolyte

A technology of graphene modification and gel polymer, which is applied in hybrid capacitor electrolytes, hybrid/electric double layer capacitor manufacturing, circuits, etc., can solve the problem of no obvious contribution to ion transport mechanism, little increase in ion conductivity, and reduced pathways To achieve the effect of promoting ion transport, improving interfacial interaction and reducing interfacial impedance

Active Publication Date: 2014-02-05
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Graphene oxide is considered to be a good ion promoter, and its own ion conductivity can reach 2.1 S / cm, which can significantly improve the polymer matrix However, related research results show that high content of graphene oxide has no significant contribution to the ion transport mechanism in polymers, and even is harmful.
This is mainly due to the spontaneous aggregation effect of graphene oxide with a higher concentration. Although the ion transport speed on the surface of graphene oxide is fast, the aggregation effect reduces and lengthens the paths available for ion transport, thus affecting the gel polymer electrolyte. The ionic conductivity of the

Method used

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  • Preparation method for boron-doped graphene-modified gel polymer electrolyte
  • Preparation method for boron-doped graphene-modified gel polymer electrolyte
  • Preparation method for boron-doped graphene-modified gel polymer electrolyte

Examples

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Embodiment 1

[0029] Measure 5 mL of 0.1 g / mL polyvinyl alcohol solution, pour it into a plastic Petri dish (Ф90mm), and let it stand without bubbles. The culture dish containing the solution was placed in a freezer at -20°C for freezing, then thawed at room temperature, and the freezing-thawing cycle operation was repeated 5 times. Take out the gel in the petri dish and soak it in 1mg / mL boric acid solution (pH~11) for about 48h. Take out the soaked gel and soak it in 6mol / L KOH solution. The electrode uses activated carbon (the specific surface area is about 1800 cm 2 / g), the mass ratio of the slurry is mixed according to activated carbon: acetylene black: polytetrafluoroethylene = 82:10:8, pressed into a film on foamed nickel, and dried in a vacuum oven at a constant temperature of 80°C More than 24 hours. The current collector is made of stainless steel compact, and the current collector / carbon electrode / gel polymer electrolyte / collector / spring sheet are assembled into a button ba...

Embodiment 2

[0031] Accurately weigh about 2.5 mg graphite oxide, dissolve it in a mixed solution of 2.5 mL deionized water and 0.05 mL 25% ammonia water, and ultrasonicate for 20 min. Measure 5 mL of 0.1 g / mL polyvinyl alcohol solution, add dropwise to the above graphene oxide aqueous solution under the action of magnetic stirring, mix until the appearance is uniform, continue to shake the solution at room temperature for 24 hours, and the pH of the solution is 9.7-9.8 . Pour the solution into a plastic petri dish (Ф90mm), and let it stand without bubbles. Place the petri dish containing the solution in a freezer at -20°C for freezing, then thaw it at room temperature, and repeat the freeze-thaw cycle operation for 5 Second-rate. Take out the gel in the petri dish and soak it in 1mg / mL boric acid solution (pH~11) for about 48h. Take out the soaked gel and soak it in 6mol / L KOH solution. The electrode uses activated carbon (the specific surface area is about 1800 cm 2 / g), the mass r...

Embodiment 3

[0033] Accurately weigh about 100 mg graphite oxide, dissolve it in a mixed solution of 2.5 mL deionized water and 0.05 mL 25% ammonia water, and ultrasonicate for 20 min. Measure 5 mL of 0.1 g / mL polyvinyl alcohol solution, add dropwise to the above graphene oxide aqueous solution under the action of magnetic stirring, mix until the appearance is uniform, continue to shake the solution at room temperature for 24 hours, and the pH of the solution is 9.7-9.8 . Pour it into a plastic petri dish (Ф90mm), and let it stand without bubbles. Place the petri dish containing the solution in a freezer at -20°C for freezing, then thaw it at room temperature, and repeat the freeze-thaw cycle operation 5 times. Take out the gel in the petri dish and soak it in 1mg / mL boric acid solution (pH~11) for about 48h. Take out the soaked gel and soak it in 6mol / L KOH solution. The electrode uses activated carbon (the specific surface area is about 1800 cm 2 / g), the mass ratio of the slurry is...

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Abstract

The invention discloses a preparation method for a boron-doped graphene-modified gel polymer electrolyte which can be applied in the fields of supercapacitors, hybrid supercapacitors, lithium ion batteries, fuel cells, etc. In the case that polyvinyl alcohol is used as a polymer matrix, the preparation method is characterized by comprising the following steps: dispersing graphene oxide in an aqueous polyvinyl alcohol solution; carrying out preformation by using a crosslinking method, e.g., preparing a polyvinyl alcohol hydrogel by using a freezing and unfreezing method; and successively soaking the hydrogel in a boric acid solution and an electrolyte solution so as to obtain the gel polymer electrolyte. The gel polymer electrolyte provided by the invention has high ion conductivity, high mechanical properties and strength and good electrode / electrolyte interface interaction and can be used for replacing a liquid electrolyte solution.

Description

technical field [0001] The invention relates to a gel polymer electrolyte, and more particularly, to a preparation method of a boron-doped graphene-modified gel polymer electrolyte. Background technique [0002] Electrolyte is one of the important components in electric energy storage and electric conversion devices. Its main role is to provide transportable ions or as a channel for ion transmission. In secondary batteries (lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries etc.), capacitors (supercapacitors, hybrid supercapacitors), sensors, and dye-sensitized solar cells have important applications. Traditional electrolytes are mainly based on liquid electrolyte systems because of their high ionic conductivity in liquid media. However, their disadvantages such as easy leakage, flammability and explosion make people constantly look for safer electrolyte systems. Although all-solid-state electrolytes can fundamentally solve the above problems, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01G11/56H01G11/84
CPCY02E60/13H01G11/56H01G11/84H01M8/1018H01M10/0565Y02E60/10Y02E60/50
Inventor 阮文红黄逸夫章明秋容敏智
Owner SUN YAT SEN UNIV
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