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Preparation method for flexible current collector

A flexible current collector and support technology, which is used in the manufacture of hybrid capacitor current collectors and hybrid/electric double-layer capacitors, can solve the problems affecting the service life of super capacitors, low energy density of super capacitors, and reduction in the specific gravity of electrode materials. The effect of prolonging life, not easily corroded, and increasing energy density

Inactive Publication Date: 2014-07-02
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

[0004] At present, in most literatures or industries, 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 the entire battery. , the proportion of the electrode material in the entire battery is greatly reduced, which ultimately leads to a low energy density of the supercapacitor
At the same time, metal materials are easily corroded, which affects the service life of supercapacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process of the graphene electrode sheet synthesized by the present invention is as follows:

[0031] (1) Expandable graphite: 500 mesh, purity 99.5%;

[0032] (2) Expanded graphite: expandable graphite is rapidly heated to 1200°C, heated for 60 seconds and then exfoliated to obtain expanded graphite.

[0033] (3) Graphene solution: Weigh 1 g of expanded graphite and 1 g of 1-ethyl-3-methylimidazolium tetrafluoroborate, mix them and grind them with an agate mortar for 5 min, then add the mixture into an aqueous solution of ethanol (wherein the solvent The ratio with water is: 9:1), and it is configured into a mixed solution of expanded graphite and ionic liquid with a concentration of 0.1mg / ml, and the mixed solution is put into a quartz reactor. Heated at a temperature of 100 °C for 2 h. The reactor was cooled to room temperature, poured out the solution, added 0.2 g of polyvinyl alcohol, and ultrasonicated at 600 rpm for 1 h to obtain a uniformly disp...

Embodiment 2

[0036] The preparation process of the graphene synthesized by the present invention is as follows:

[0037] (1) Expandable graphite: 400 mesh, purity 99%;

[0038] (2) Expanded graphite: expandable graphite is rapidly heated to 800°C, heated for 10 seconds and then exfoliated to obtain expanded graphite.

[0039] (3) Graphene solution: Weigh 3g of expanded graphite and 1g of 1-hexadecyl-3-methylimidazolium bromide, mix and grind for 20min with an agate mortar, then add the mixture to isopropanol and aqueous solution (where The ratio of solvent to water is: 5:5), configured as a mixed solution of expanded graphite and ionic liquid with a concentration of 0.5mg / ml, and put the mixed solution into a quartz reactor. Heating at a temperature of 150° C. for 5 h. Cool the reactor to room temperature, pour out the solution, add 0.5 g of polyvinylpyrrolidone, and then put the suspension into a planetary ball mill for high-speed ball milling for 3 hours, and the rotation frequency of ...

Embodiment 3

[0042] The preparation process of the graphene paper synthesized by the present invention is as follows:

[0043] (1) Expandable graphite: 100 mesh, purity 99%;

[0044] (2) Expanded graphite: expandable graphite is rapidly heated to 800°C, heated for 10 seconds and then exfoliated to obtain expanded graphite.

[0045](3) Graphene solution: Weigh 5g of expanded graphite and 1g of 1-aminoethylpyridinium bromide, mix them and grind them with an agate mortar for 5min, then add the mixture to an aqueous solution of glycerin (the ratio of solvent to water is: 5:5), configured as a mixed solution of expanded graphite and ionic liquid with a concentration of 1mg / ml, and put the mixed solution into a quartz reactor. Cool the reactor to room temperature, add 0.5 g of methylcellulose, put the suspension into a planetary ball mill for high-speed ball milling for 3 hours, and the rotation frequency of the ball mill is 50 Hz.

[0046] (4) Flexible current collector: Spray the graphene su...

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Abstract

The invention belongs to the field of current collector preparation, and discloses a preparation method for a flexible current collector. The method comprises the following steps: expanded graphite is prepared; graphene solution is prepared by utilizing the expanded graphite; and the current collector is prepared by utilizing the graphene solution. According to the preparation method for the flexible current collector, graphene is stripped by intercalation via ionic liquid so that the graphene is stripped and an objective of dispersion is achieved, graphene conductivity is relatively high, and preparation of a graphene thin film via a spraying mode is relatively simple; the prepared current collector is formed by the graphene and a supporting body, wherein density of the graphene and the supporting body is relatively low and mass of the current collector is relatively low so that energy density of a super capacitor can be greatly enhanced; besides, the graphene is high in chemical stability and is not liable to be corroded so that the service life of the super capacitor can be enhanced.

Description

technical field [0001] The invention relates to the field of preparation of current collectors, in particular to a preparation method of flexible current collectors. Background technique [0002] 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 Military fields, mobile communication devices, computers, and hybrid power sources for electric vehicles, etc. Generally, a supercapacitor is mainly assembled by an electrode active material layer, an electrolyte, a separator, a current collector, and a casing. The energy density of existing supercapacitors is generally relatively low. The main factors affecting the energy density of supercapacitors are the capacitance of the electrode material, the voltage of the system, and the proportion of...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/68
Inventor 周明杰吴凤王要兵袁新生
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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