Preparation method of Ni(OH)2/graphene composite material and preparation method of supercapacitor

A technology of supercapacitors and composite materials, applied in the direction of hybrid capacitor electrodes, graphene, chemical instruments and methods, etc., can solve the problems of lack of dangling bonds and defect sites, poor conductivity of graphite oxide, etc., to increase uniformity and binding ability , Improve energy density, high conductivity effect

Active Publication Date: 2021-09-21
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]However, the surface of graphene lacks dangling bonds and defect sites, so it is difficult to form a composite structure with nickel hydroxide nanostructures that is uniformly dispersed and has good interfacial contact; while graphene oxide Although there are a large number of oxygen-containing functional groups on the surface, which provide anchoring sites for nickel hydroxide nanostructures, graphite oxide has the problem of poor conductivity. At the same time, based on simple surface functional group anchoring, the corresponding nickel hydroxide / graphene oxide interface conductivity also needs to be further improved

Method used

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  • Preparation method of Ni(OH)2/graphene composite material and preparation method of supercapacitor
  • Preparation method of Ni(OH)2/graphene composite material and preparation method of supercapacitor
  • Preparation method of Ni(OH)2/graphene composite material and preparation method of supercapacitor

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Embodiment 1

[0041] Ni (OH) of the present invention, one kind of 2 / Graphene producing a composite material, comprising the steps of:

[0042] Preparation of (1) a porous graphene oxide (HGO) solution: 5mL concentration of 30% H 2 O 2 Aqueous solution 50mL 2mg / mL solution of graphene oxide (GO) are mixed and then magnetically stirred under heating at 95 deg.] C reaction 4h. After completion of the reaction, the centrifuge (rotational speed: 12000r / min, Time: 10min) and washed twice to remove remaining mixture H 2 O 2 To achieve the purpose of purifying porous graphene oxide, the graphene oxide porous purified (HGO), HGO was then dispersed in 50mL of deionized water, and ultrasonic dispersion, a concentration of 2mg / mL HGO uniform dispersion;

[0043] (2) Ni (OH) 2 / -En Composite Graphite: the step of taking 12.5mL HGO dispersion (1) prepared was dissolved in 50ml of DMF, and added to a round bottom flask, the mixture was heated with stirring (magnetic stirrer) to 80 ℃, the was added 5m...

Embodiment 2

[0056] Ni (OH) prepared in Example 1 of the present embodiment to embodiment 2 / HGO based composite flexible printed super capacitor device, particularly the preparation process is as follows:

[0057] (1) Ni (OH) 2 Preparation / HGO Composites: same method of Preparation Example 1;

[0058] (2) Ni (OH) 2 / HGO ink prepared: a mass ratio of 7.5: 1.5: 1 ratio 0.134g Ni (OH) 2 / HGO composite powder, 0.0268 g of acetylene black, 0.357 g of 5% strength aqueous binder LA133 and add an appropriate amount of water, formulated to a viscosity of 0.2Pa · s for screen printing Ni (OH) 2 / HGO ink;

[0059] (3) Preparation of a printed super capacitor: Ni prepared by the 200-mesh screen plate silver nanoparticle paste, the step (2) (OH) 2 / HGO ink, PVA basic successively superimposed solid electrolyte printed on PET, made of a super capacitor patterns (1x1cm 2 Solid pattern), then the product obtained by the screen printing oven dried 10min at 70 ℃, forming a flexible supercapacitor device...

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Abstract

The invention discloses a preparation method of a Ni(OH)2/graphene composite material, which comprises the following steps of adding porous graphene oxide dispersion liquid into N, N-dimethylformamide, adding nickel acetate, reacting at constant temperature, centrifuging and washing, and dissolving the washed product in water, carrying out hydrothermal reaction, and after the reaction is finished, drying to obtain the Ni(OH)2/graphene composite material. The invention also provides a method of the supercapacitor. The method comprises the following steps that Ni(OH)2/HGO ink is prepared from the Ni(OH)2/graphene composite material; and the silver paste and the Ni(OH)2/HGO ink are sequentially overlaid and brushed on a PET plate through silk-screen printing to form a pattern, and drying is carried out to complete the preparation of the supercapacitor. According to the Ni(OH)2/HGO composite nano material prepared by the invention, the voltage window of the supercapacitor can be improved to a great extent, so that the energy density of the supercapacitor is improved to a great extent.

Description

Technical field [0001] The invention belongs to the field of flexible supercapacitor, in particular to a Ni (OH) 2 Preparation method of graphene composites and preparation method of supercapacitor. Background technique [0002] With the rapid development of intelligent wearable electronic fields, the need for corresponding flexible energy storage equipment is increased. Flexible Supercapacitor is considered an ideal flexible energy storage device due to its feature of high power density, high charge rate, long life, flexibility, and safety. Printelectelectronics as a new field, in recent years, due to its rapid development, full print flexible supercapacitors based on printing electronic technology developed due to its advantages such as its excellent flexibility, low cost and large-scale production methods. The flexible electronic field has huge application prospects. [0003] The active electrode material is a core component of a flexible supercapacitor, and therefore an elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01B32/184H01G11/24H01G11/30H01G11/36
CPCC01G53/04C01B32/184H01G11/24H01G11/30H01G11/36C01P2004/03C01P2006/40C01B2204/22Y02E60/13
Inventor 蒋昌忠吴学立宋先印曾帆张新刚
Owner HUNAN UNIV
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