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Graphene/graphene oxide thin film and preparation method thereof, and super capacitor

A graphene film and graphene technology, which is applied in the field of electrochemistry, can solve the problems of reducing the safety of batteries or supercapacitors, low energy density of batteries or supercapacitors, and increasing electrode reaction resistance, and achieves the electrochemical stable potential window. Large, excellent mechanical properties and electrical conductivity, the effect of enhancing mechanical strength

Inactive Publication Date: 2014-05-07
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Usually, aluminum foil is used for the positive electrode of the current collector, and copper / nickel foil is used for the negative electrode. Low; and, in the case of multiple charge-discharge cycles and overcharge, the electrolyte will undergo a reduction reaction on the surface of the metal current collector, causing it to corrode, and the resistance of the electrode reaction will increase, resulting in significantly faster capacity decay, reducing the battery or supercapacitor. Use security

Method used

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  • Graphene/graphene oxide thin film and preparation method thereof, and super capacitor
  • Graphene/graphene oxide thin film and preparation method thereof, and super capacitor

Examples

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Effect test

Embodiment 1

[0042] A kind of preparation method of graphene / graphene oxide thin film, comprises the following steps:

[0043] (1) Preparation of graphene oxide film: Take 0.14g of graphite oxide and disperse it in 560mL of deionized water, and ultrasonically prepare a suspension of graphene oxide with a concentration of 0.25g / L, which is vacuum filtered through a microporous filter membrane to obtain a filter. Cake, weigh copper nitrate according to the mass ratio of copper element to graphene oxide 0.01:1, add water to make a 50% concentration of copper nitrate solution, soak the filter cake in the copper nitrate solution, soak for 10min, filter the microporous membrane Peel it off, rinse the filter cake twice with ethanol, and dry it in a vacuum oven at 40°C to obtain a graphene oxide film with a thickness of 3 μm.

[0044] (2) Preparation of graphene suspension: add 1g of 1-hexadecyl-3-methylimidazolium bromide to 2L of water to prepare 1-hexadecyl-3-methylimidazolium with a concentrat...

Embodiment 2

[0047] A kind of preparation method of graphene / graphene oxide thin film, comprises the following steps:

[0048](1) Preparation of graphene oxide film: Take 0.37g of graphite oxide and disperse it in 750mL of ethanol, and ultrasonically prepare a suspension of graphene oxide with a concentration of 0.5g / L, which is vacuum filtered through a microporous membrane to obtain a filter cake , according to the mass ratio of cobalt element and graphene oxide 0.05:1, take cobalt nitrate, add water and make concentration be 40% cobalt nitrate solution, soak this filter cake in the solution of cobalt nitrate, soak 30min, microporous filter The film was peeled off, the filter cake was rinsed with ethanol three times, and dried in a vacuum oven at 50°C to obtain a graphene oxide film with a thickness of 8 μm.

[0049] (2) Preparation of graphene suspension: add 0.5g of 1-butyl-3-methylimidazolium hexafluorophosphate to 1L of DMF to prepare 1-butyl-3-methyl with a concentration of 0.5g / L ...

Embodiment 3

[0052] A kind of preparation method of graphene / graphene oxide thin film, comprises the following steps:

[0053] (1) Preparation of graphene oxide film: Take 0.47g of graphite oxide and disperse it in 630mL of isopropanol, ultrasonically prepare a suspension of graphene oxide with a concentration of 0.75g / L, and vacuum filter it through a microporous membrane to obtain Filter cake, take nickel nitrate according to the mass ratio of nickel element and graphene oxide 0.1:1, add in water and be made into the nickel nitrate solution that concentration is 30%, this filter cake is soaked in nickel nitrate solution, soaks 60min, micro The porous filter membrane was peeled off, the filter cake was washed 4 times with ethanol, and dried in a vacuum oven at 60°C to obtain a graphene oxide film with a thickness of 10 μm.

[0054] (2) Preparation of graphene suspension: Add 0.3g of 1-ethyl-3-methylimidazole hexafluorophosphate to 300mL DMSO to prepare 1-ethyl-3-methylimidazole with a con...

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Abstract

The invention discloses a graphene / graphene oxide thin film and a preparation method thereof, and a super capacitor. The preparation method of the graphene / graphene oxide thin film comprises a first step in which vacuum filtration is carried out on a graphene oxide suspension via a microporous filtering film, the microporous filtering film to which a filter cake attached is placed in a metal precursor solution for immersion, the microporous filtering film is removed, alcohol is used for repeatedly washing the filter cake, and the graphene oxide thin film is obtained after drying, a second step in which grapheme is added to an imidazolium-based ionic liquid solution for ultrasonic dispersion and a grapheme suspension is formed, and a third step in which the graphene oxide thin film obtained in the first step is placed at the bottom of a beaker, the grapheme suspension obtained in the second step slowly drops on and coats the graphene oxide thin film, a grapheme thin film is obtained, and the graphene / graphene oxide thin film is obtained when the dropping liquid spreads out fully and is dried. The graphene / graphene oxide thin film is light in weight, high in conductivity and strong in mechanical properties. The super capacitor adopts the graphene / graphene oxide thin film as a current collector and is large in energy-storage capacity and long in service life.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a graphene / graphene oxide film, a preparation method thereof, and a supercapacitor. 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 material, 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 good mechanical properties. , light weight, small internal resistance and so on. [0003] Usually, aluminum foil is used for the positive electrode of the current collector, and copper / nickel foil is used for the negative electrode. Low; and, in the case of multiple charge-discharge cycles and overcharge, the electrolyte will undergo a reduction reaction on the surface of the metal current collector, causing it to corrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/004H01G9/145
CPCY02E60/13
Inventor 周明杰吴凤王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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