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Graphene/organic thin film composite current collector, preparation method thereof, electrochemical electrode and electrochemical battery or capacitor

An organic thin film and graphene technology, applied in the field of synthesis and preparation of new materials, can solve problems such as affecting the service life of energy storage devices, low energy density of energy storage devices, and reducing the weight ratio of electrode materials, and achieves low cost, improved power density, The effect of easy large-scale industrial production

Inactive Publication Date: 2014-03-12
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, metal current collectors are commonly used. Aluminum foil is generally used for positive electrode current collectors, and copper foil is used for negative electrode current collectors. However, due to the high density and heavy weight of metal current collectors, the weight of general current collectors accounts for 20~25% of the entire battery. %, which reduces the weight ratio of the electrode material, resulting in a lower energy density of the energy storage device; at the same time, the metal material is easily corroded, which affects the service life of the energy storage device

Method used

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  • Graphene/organic thin film composite current collector, preparation method thereof, electrochemical electrode and electrochemical battery or capacitor

Examples

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Effect test

Embodiment 1

[0033] A preparation method of a graphene / organic film composite current collector, comprising the following steps:

[0034] (1) Provide a PET film with a thickness of 6 μm, soak it with 1mol / L HCL, and then wash it with ethanol three times;

[0035] (2) Take graphite oxide, add it to deionized water, and ultrasonically disperse for 0.5 h to obtain a graphene oxide suspension with a concentration of 0.25 mg / mL, then slowly add 0.1 mol / L sodium hydroxide solution to adjust the pH to 10, and then , add hydrazine hydrate solution (in N 2 h 4 mass meter, the mass concentration is 85%), reacted at 120°C for 12 hours, and filtered with suction to obtain graphene, and added the graphene to DMSO to obtain a graphene suspension;

[0036] Among them, the hydrazine hydrate solution by N 2 h 4 The mass ratio with graphite oxide is 1:10 to add; DMSO solvent accounts for 10% of the total mass of the graphene suspension;

[0037] (3) Evenly coat the graphene suspension on the PET film, ...

Embodiment 2

[0045] A preparation method of a graphene / organic film composite current collector, comprising the following steps:

[0046] (1) Provide a PEN film with a thickness of 6 μm, soak it with 1mol / L HCL, and then wash it with ethanol three times;

[0047] (2) Take graphite oxide, add it to ethanol, and ultrasonically disperse for 0.5h to obtain a graphene oxide suspension with a concentration of 1mg / mL, then slowly add 0.1mol / L ammonia solution to adjust the pH to 11, and then add hydrazine hydrate solution (in N 2 h 4 mass, the mass concentration is 85%), reacted at 90°C for 18 hours, and suction filtered to obtain graphene, which was added to N-methylpyrrolidone (NMP) to obtain a graphene suspension;

[0048] Among them, the hydrazine hydrate solution by N 2 h 4 The mass ratio with graphite oxide is 5:10; NMP solvent accounts for 20% of the total mass of the graphene suspension;

[0049] (3) Evenly coat the graphene suspension on the PEN film, dry it at 80°C for 10 hours, pr...

Embodiment 3

[0052] A preparation method of a graphene / organic film composite current collector, comprising the following steps:

[0053] (1) Provide a PC film with a thickness of 20 μm, soak it with 1mol / L HCL, and then wash it twice with ethanol;

[0054] (2) Take graphite oxide, add it to n-butanol, and disperse it ultrasonically for 1 hour to obtain a graphene oxide suspension with a concentration of 0.5 mg / mL, then slowly add 0.1 mol / L potassium hydroxide solution to adjust the pH to 11, and then , add hydrazine hydrate solution (in N 2 h 4 Mass meter, the mass concentration is 85%), reacted at 100°C for 12 hours, and suction filtered to obtain graphene, which was added to N,N-dimethylformamide (DMF) to obtain graphene suspension;

[0055] Among them, the hydrazine hydrate solution by N 2 h 4 The mass ratio with graphite oxide is 7:10 to add; DMF solvent accounts for 30% of the total mass of the graphene suspension;

[0056] (3) Evenly coat the graphene suspension on the PC fil...

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Abstract

The invention provides a graphene / organic thin film composite current collector and a preparation method thereof. The method comprises the steps that graphite oxide is taken and added into a solvent; after ultrasonic dispersion, graphene oxide suspension liquid is acquired; pH is adjusted to 10 to 11; a hydrazine hydrate solution is added; after reaction, filtration is carried out to acquire graphene; the graphene is added into an organic solvent to acquire graphene suspension liquid; the graphene suspension liquid is coated on an organic thin film; after drying is carried out, roller pressing is repeatedly carried out; and after the soaking of the mixed solution of acetone and isopropyl alcohol, roller pressing is repeatedly carried out, so as to acquire the graphene / organic thin film composite current collector. According to the method, the process is simple; the use of an adhesive is not needed; the prepared graphene / organic thin film composite current collector has the advantages of light quality, strong electrical conductivity, corrosion resistance and small contact resistance with a battery active material; and the power density and the cycle life of the electrochemical battery or capacitor can be improved. The invention further provides an electrochemical electrode and the electrochemical battery or capacitor employing the electrode.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of new materials, in particular to a graphene / organic film composite current collector, a preparation method thereof, and an electrochemical electrode. The invention also relates to an electrochemical cell or capacitor. Background technique [0002] The current collector is a structure or part that collects current. Its main function is to gather the current generated by the active materials of the battery, provide electronic channels, accelerate charge transfer, and improve the coulombic efficiency of charging and discharging. As a current collector, it needs to meet high conductivity and mechanical properties. Good, light weight, small internal resistance and other characteristics. [0003] Graphene is a two-dimensional carbon atom crystal discovered by Andre K. Geim of the University of Manchester in 2004. Due to its unique structure and photoelectric properties, it has become a carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/004H01G9/042H01M4/66
CPCY02E60/10Y02E60/13
Inventor 周明杰王要兵吴凤
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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