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Nitrogen-doped graphene/metal composite current collector and preparation method thereof

A nitrogen-doped graphene and metal composite technology, applied in the direction of electrode carriers/current collectors, capacitor parts, etc., can solve the problems of mechanical strength gap of graphene films, insufficient uniformity of graphene films, and difficulty in obtaining graphene suspensions. , to achieve the effect of enhancing mechanical strength and electrical conductivity, easy large-scale industrial production, and simple equipment

Inactive Publication Date: 2014-05-07
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

[0005] At present, the graphene film is mainly prepared by directly filtering the graphene suspension. Because it is difficult to obtain a stable graphene suspension, the prepared graphene film is not uniform enough and the arrangement is irregular. In addition, the theory of graphene The mechanical strength is very high, but the mechanical strength of the graphene film prepared by the filtration method is often far from the theory

Method used

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  • Nitrogen-doped graphene/metal composite current collector and preparation method thereof
  • Nitrogen-doped graphene/metal composite current collector and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] A preparation method of nitrogen-doped graphene / metal composite current collector, comprising the following steps:

[0038] (1) Add 1 g of graphite oxide to an aqueous solution containing 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid (1 g) to prepare a mixed solution of graphite oxide ionic liquid with a concentration of 0.5 g / L. Ultrasound for 0.5 hours;

[0039] (2) After the ultrasonication is completed, add 5 g of urea solution with a mass concentration of 20% to the above mixed solution. After ultrasonication for 10 minutes, put the obtained mixed solution into a hydrothermal reaction kettle and react at 80°C for 5 hours to obtain a stable nitrogen doped solution. Assorted graphene ionic liquid mixed solution, after cooling down to room temperature, add 10mmol / L copper nitrate solution 80mL, stir 5min, obtain the nitrogen-doped graphene ionic liquid mixed solution rich in copper nitrate;

[0040] (3) Use a mixed fiber membrane with a pore size of 50 n...

Embodiment 2

[0043] A preparation method of nitrogen-doped graphene / metal composite current collector, comprising the following steps:

[0044] (1) Take 1g of graphite oxide and add it to the DMF solution containing 1-hexadecyl-3-ethylimidazolium bromide salt ionic liquid (3g) to prepare a graphite oxide ionic liquid mixed solution with a concentration of 1g / L, and ultrasonically 1 hour;

[0045](2) After the ultrasonication is completed, add 1.25 g of urea solution with a mass concentration of 40% to the above mixed solution. After ultrasonication for 20 minutes, put the obtained mixed solution into a hydrothermal reaction kettle and react at 120°C for 8 hours to obtain stable nitrogen Doped graphene ionic liquid mixed solution, after cooling down to room temperature, add 5mmol / L cobalt nitrate solution 370mL, stir 20min, obtain the nitrogen-doped graphene ionic liquid mixed solution rich in cobalt nitrate;

[0046] (3) Vacuum filter the cobalt nitrate-rich nitrogen-doped graphene ionic ...

Embodiment 3

[0049] A preparation method of nitrogen-doped graphene / metal composite current collector, comprising the following steps:

[0050] (1) Take 1g of graphite oxide and add it to the NMP solution containing 1-dodecyl-3-methylimidazolium bromide salt ionic liquid (5g) to prepare a mixed solution of graphite oxide ionic liquid with a concentration of 3g / L, and ultrasonically 3 hours;

[0051] (2) After the ultrasonication is completed, add 0.6 g of urea solution with a mass concentration of 50% to the above mixed solution. After ultrasonication for 30 minutes, put the obtained mixed solution into a hydrothermal reaction kettle and react at 150°C for 12 hours to obtain stable nitrogen Doped graphene ionic liquid mixed solution, after cooling down to room temperature, add 1mmol / L nickel nitrate solution 3L, stir 5min, obtain the nitrogen-doped graphene ionic liquid mixed solution rich in nickel nitrate;

[0052] (3) Use a cellulose acetate membrane with a pore size of 200 nm to vacuu...

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Abstract

The invention provides a nitrogen-doped graphene / metal composite current collector and a preparation method thereof. The preparation method comprises steps: graphite oxide is taken to be added to an imidazole-based ionic liquid solution and a mixed solution is obtained; after ultrasound is carried out for 0.5 to 3 hours, an urea solution is added; after ultrasound is carried out for 10 to 30min, reaction is carried out for 5 to 12 hours at the temperature of 80 to 150 DEG; when the temperature is reduced to the room temperature, a metal salt solution is added, and stirring is carried out for 5 to 60min; vacuum filtration is carried out on the obtained solution by adopting a microporous membrane; a filter cake is dried at the temperature of 40 to 60 DEG, the membrane is removed, and a nitrogen-doped grapheme membrane with metal salt is obtained; the membrane is placed in a tubular furnace, argon is inputted to exhaust air, a mixed argon and hydrogen is inputted, heating is carried out for 0.5 to 5 hours at the temperature of 200 to 600 DEG and the nitrogen-doped graphene / metal composite current collector is obtained. The preparation method is simple, and the obtained nitrogen-doped grapheme / metal composite current collector is strong in mechanical strength, strong in conductive performances and uniform in thickness.

Description

technical field [0001] The invention relates to the field of synthesis and preparation of new materials, in particular to a nitrogen-doped graphene / metal composite current collector and a preparation method thereof. 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] At present, aluminum foil is generally used for the positive electrode of the current collector, and copper foil is used for the negative electrode. Due to the high density and heavy weight of the metal current collector, the weight of the general current collector accounts for 20-25% of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/004H01M4/66
CPCY02E60/10
Inventor 周明杰吴凤王要兵钟玲珑
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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