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Preparation method of graphene current collector

A graphene and current collector technology, applied in the field of graphene current collector preparation, can solve the problems of poor adhesion between metal current collectors and active materials, affecting the cycle life of supercapacitors, affecting the utilization rate of electrode materials, etc., and achieves light weight. , The effect of reducing weight and high mechanical strength

Inactive Publication Date: 2020-10-23
ZHAOQING LEOCH BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally, the positive current collector is made of aluminum foil, and the negative current collector is made of metal current collectors such as copper foil. During the charging process, the metal current collector directly contacts the electrolyte. Therefore, the positive and negative current collectors are more prone to corrosion, which in turn affects the supercapacitor cycle life
In addition, the metal current collector and the active material are not firmly adhered, and the interface is difficult to be tightly combined, which affects the utilization rate of the electrode material and increases the contact resistance.

Method used

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  • Preparation method of graphene current collector

Examples

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Effect test

Embodiment 1

[0029] A preparation method of graphene current collector, is characterized in that, comprises the following steps:

[0030] (1) Weigh 15g sodium hydroxymethyl cellulose and add it to 10Kg of deionized water, use a stirrer and ultrasonically mix evenly, then add 500g graphene prefabricated solution and stir to mix evenly. Wherein, the graphene prefabricated liquid is a suspension of graphene and water. The graphene prefabricated liquid contains 100g of graphene, and an appropriate amount of deionized water is added to adjust the graphene content. Finally, after ultrasonic dispersion treatment for 1h, the graphene suspension is obtained by filtration. liquid, wherein the content of graphene in the graphene suspension is controlled at 8㎎ / ml;

[0031] (2) the graphene suspension that will configure is passed through the nylon membrane vacuum filtration of 100nm in micropore diameter, when seeing that there is no obvious filtrate on the precursor cake, add polyvinyl alcohol aqueou...

Embodiment 2

[0034] A preparation method of graphene current collector, is characterized in that, comprises the following steps:

[0035] (1) Weigh 50g of styrene-butadiene rubber and add it to 10Kg of deionized water, use a stirrer and ultrasonically mix evenly, then add 500g of graphene prefabricated solution and stir to mix evenly. Wherein, the graphene prefabricated liquid is a suspension of graphene and water. The graphene prefabricated liquid contains 100g of graphene, and an appropriate amount of deionized water is added to adjust the graphene content. Finally, after ultrasonic dispersion treatment for 1h, the graphene suspension is obtained by filtration. liquid, wherein the content of graphene in the graphene suspension is controlled at 8㎎ / ml;

[0036] (2) the graphene suspension that will configure is passed through the nylon membrane vacuum filtration of 100nm in micropore diameter, when seeing that there is no obvious filtrate on the precursor cake, add polyvinyl alcohol aqueou...

Embodiment 3

[0039] A preparation method of graphene current collector, is characterized in that, comprises the following steps:

[0040] (1) Weigh 50g of polyvinyl alcohol and add it to 10Kg of deionized water, use a stirrer and ultrasonically mix evenly, then add 500g of graphene prefabricated solution and stir to mix evenly. Wherein, the graphene prefabricated liquid is a suspension of graphene and water. The graphene prefabricated liquid contains 100g of graphene, and an appropriate amount of deionized water is added to adjust the graphene content. Finally, after ultrasonic dispersion treatment for 1h, the graphene suspension is obtained by filtration. liquid, wherein the content of graphene in the graphene suspension is controlled at 8㎎ / ml;

[0041] (2) the graphene suspension that will configure is passed through the nylon membrane vacuum filtration of 100nm in micropore diameter, when seeing that there is no obvious filtrate on the precursor cake, add polyvinyl alcohol aqueous solut...

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Abstract

The invention discloses a preparation method of a graphene current collector. The preparation method is characterized by comprising the following steps of: mixing graphene, a binder and a solvent to obtain a graphene suspension; carrying out vacuum filtration on the graphene suspension through using a microporous filter membrane, then adding a polymer solution to a precursor filter cake obtained by filtration to obtain a mixed solution, then filtering the mixed solution until the mixed solution is completely filtered, and drying the completely filtered filter cake in a drying oven at 50-100 DEG C to obtain a graphene thin film; and taking out the graphene thin film together with the microfiltration membrane, and treating the graphene thin film and the microfiltration membrane at 300-1200 DEG C in a protective atmosphere to obtain the graphene current collector. The cyclic service life of an electrode material can be prolonged.

Description

technical field [0001] The embodiments of the present invention relate to the field of composite material preparation, in particular to a method for preparing a graphene current collector. 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] Supercapacitor is a new type of energy storage device, which has the advantages of high power density (more than 10 times that of ordinary batteries), high cycle life (the number of cycles can reach more than 100,000 times), and good fast charge and discharge performance. It is widely used in Mixed power lamps in mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/68H01G11/86
CPCH01G11/68H01G11/86
Inventor 程养辉颜蔚
Owner ZHAOQING LEOCH BATTERY TECH
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