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Preparation method of shell-imitated layered high-strength graphene composite electrode material

A graphene composite and electrode material technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of not significantly improving the mechanical and capacitive properties of electrode materials, limited electron transfer, and poor cycle stability In order to achieve the effect of flexible and rich interface design and achieve flexibility

Active Publication Date: 2019-05-14
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method leads to the preparation of electrode materials showing low energy density, limited electron transfer and poor cycle stability.
(3) Lv et al. also reported that the flexibility of supercapacitors can be achieved by means of fiber spinning, cutting or editing (Adv.Mater.2018, 30, 1704531). flexible, but these flexible supercapacitors are often dominated by the electrochemical behavior of the electric double layer, which is accompanied by low electrochemical energy storage capacity
At present, there are few reports on related patents on layered high-strength graphene composite electrode materials, and the mechanical properties and capacitance properties of the electrode materials discussed in the above papers have not been significantly improved.

Method used

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  • Preparation method of shell-imitated layered high-strength graphene composite electrode material
  • Preparation method of shell-imitated layered high-strength graphene composite electrode material
  • Preparation method of shell-imitated layered high-strength graphene composite electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Measure the graphene oxide homogeneous dispersion of 1.744mL (density is 7.74mg mL -1 ), add 7.992mL of distilled water, stir for 10min, then ultrasonically disperse for 10min, a brown transparent solution is obtained. 0.264ml halloysite-polyaniline solution (density 5.68mg mL -1 ) was added dropwise into the uniformly dispersed graphene oxide solution, and the stirring was continued for 12 hours. After the reaction was complete, the reaction solution was ultrasonically treated for 5 minutes. The above reaction solution was vacuum filtered for 24 hours to obtain a graphene oxide composite material with a layered biomimetic structure. The above reaction solution was vacuum filtered for 24 hours to obtain a graphene oxide composite material with a layered biomimetic structure. During the suction filtration process, the halloysite-polyaniline content is small, and the graphene oxide sheets are oriented in an orderly manner under the action of water flow, forcing the hall...

Embodiment 2

[0037] Measure the graphene oxide homogeneous dispersion of 1.647mL (density is 7.74mg mL -1 ), add 7.957mL of distilled water, stir for 10min, and then ultrasonically disperse for 10min, a brown transparent solution. 0.396ml halloysite-polyaniline solution (density 5.68mg mL -1 ) was added dropwise into the uniformly dispersed graphene oxide solution, and the stirring was continued for 12 hours. After the reaction was complete, the reaction solution was ultrasonically treated for 5 minutes. The above reaction solution was vacuum filtered for 24 hours to obtain a graphene oxide composite material with a layered biomimetic structure. During the suction filtration process, the halloysite-polyaniline content is small, and the graphene oxide sheets are oriented in an orderly manner under the action of water flow, forcing the halloysite-polyaniline to be arranged in an orderly manner, the reaction sites are exposed, and the interface chemical interaction is the strongest . Therm...

Embodiment 3

[0039] Measure the graphene oxide homogeneous dispersion of 1.550mL (density is 7.74mg mL -1 ), add 8.062mL of distilled water, stir for 10min, and then ultrasonically disperse for 10min to form a brown transparent solution. 0.528ml halloysite-polyaniline solution (density 5.68mg mL -1 ) was added dropwise into the uniformly dispersed graphene oxide solution, and the stirring was continued for 12 hours. After the reaction was complete, the reaction solution was ultrasonically treated for 5 minutes. The above reaction solution was vacuum filtered for 24 hours to obtain a graphene oxide composite material with a layered biomimetic structure. During the suction filtration process, the halloysite-polyaniline content was high, which affected the orderly orientation of graphene oxide sheets under the action of water flow, and the chemical sites were not exposed completely, which hindered the occurrence of interfacial chemical interactions. Then the graphene oxide composite materia...

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Abstract

The invention relates to a preparation method of a shell-imitated layered high-strength graphene composite electrode material. A shell in the nature is mainly formed through organic / inorganic micro-nano multi-level layer-by-layer assembling and synergetic interface interaction and shows excellent toughness and mechanical strength. Enlightened by a multi-level layered structure and a synergetic interface of the natural shell, graphene oxide (inorganic phase) and polyaniline-halloysite nanocomposite (organic phase) are used to bionically prepare the high-strength graphene composite electrode material through pi-pi conjugation, hydrogen bonds and electrostatically synergetic interface interaction, and the tensile strength of the material is three times that of the natural shell. Meanwhile, excellent flexibility is shown when the material is applied to an all-solid-state super capacitor, the assembled all-solid-state flexible super capacitor maintains good energy-storing stability no matter in a spreading, bending or stretching state or after 5,000 times of 180-degree bending, and therefore the material has broad application prospects in aerospace, intelligent wearable devices and other energy-storing fields.

Description

technical field [0001] The invention relates to a method for preparing a shell-like layered high-strength graphene composite electrode material, which belongs to the field of nanocomposite material preparation. Background technique [0002] Due to its advantages of portability, bendability and light weight, flexible electronic devices have been widely used in the fields of sensors, medical and health care, mini robots and aerospace. Therefore, it is urgent to develop an energy storage device with high mechanical strength and high energy storage capacity. In recent years, flexible supercapacitors have been increasingly used in flexible electronic devices in different fields. As an energy storage device, flexible supercapacitors often exhibit high energy density, fast charge and discharge capabilities, long cycle life, and excellent safety, and are expected to replace traditional batteries. However, it is still a great challenge to develop a flexible electrode material with ...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/36H01G11/38H01G11/86
CPCY02E60/13
Inventor 程群峰周天柱
Owner BEIHANG UNIV
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