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 collect

Method used

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Examples

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Example Embodiment

[0029] Example 1

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

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

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

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

Example Embodiment

[0035] Example 2

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

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

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

[0039] (3) Graphene solution: Weigh 3g of expanded graphite, 1g of 1-hexadecyl-3-methylimidazole bromide, mix and grind with an agate mortar for 20 minutes, then add the mixture to isopropanol and aqueous solution (wherein The ratio of solvent to water is: 5:5), it is configured into a mixed solution of expanded graphite and ionic liquid with a concentration of 0.5 mg / ml, and the mixed solution is put into a quartz reactor. Heat for 5h at a temperature of 150°C. The reaction kettle was cooled to room temperature, the solution was poured out, 0.5 g of polyvinylpyrrolidone was added, and then the suspension was put into a planetary ball mill for high-speed ball mi...

Example Embodiment

[0041] Example 3

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

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

[0044] (2) Expanded graphite: The expandable graphite is quickly 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-aminoethylpyridine bromide, mix and grind with an agate mortar for 5 minutes, and then add the mixture to the aqueous solution of glycerin (the ratio of solvent to water is: 5:5), configure a mixed solution of expanded graphite and ionic liquid with a concentration of 1 mg / ml, and put the mixed solution into a quartz reactor. The reaction kettle was cooled to room temperature, 0.5 g of methyl cellulose was added, and the suspension was put into a planetary ball mill for high-speed ball milling for 3 hours, and the ball mill rotation frequency was 50 Hz.

[0046] (4) Flexible current ...

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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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