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A graphene/manganese dioxide-based asymmetric coaxial fiber supercapacitor and its preparation and application

A manganese dioxide-based, supercapacitor technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, fiber chemical characteristics, etc., can solve the problems that the performance of fiber supercapacitors cannot meet the needs of use, short circuit or separation, etc. Achieve low cost, improve specific energy density, and good flexibility

Active Publication Date: 2020-08-11
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor and its preparation and application, so as to overcome the fact that the performance of fiber-shaped supercapacitors in the prior art cannot meet the use requirements, and in It is easy to cause short circuit or separation defects during bending and use

Method used

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  • A graphene/manganese dioxide-based asymmetric coaxial fiber supercapacitor and its preparation and application
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  • A graphene/manganese dioxide-based asymmetric coaxial fiber supercapacitor and its preparation and application

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Embodiment 1

[0028] A graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor, the capacitor has a three-layer structure, the inner electrode in the center is a graphene / manganese dioxide hybrid fiber, and the outermost layer is pure graphene , The two layers are separated by phosphoric acid / polyvinyl alcohol as the electrolyte to prevent short-circuiting of the internal and external electrodes. Concrete preparation method comprises the following steps:

[0029] (1) Dissolve 0.5g of graphite oxide in 20ml of ultrapure water, and obtain a graphite oxide dispersion with a concentration of 25mg / mL after ultrasonic dispersion;

[0030] (2) Ultrasonic disperse 0.27g of manganese chloride tetrahydrate in 50mL of isopropanol, add 0.15g of potassium permanganate and 5ml of deionized water at 85°C after 30 minutes and stir, condense and reflux for 30 minutes to room temperature to obtain manganese nanorods. And it is that the ratio that is 1:10 joins in the graphite oxide dispers...

Embodiment 2

[0036]A graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor, the capacitor has a three-layer structure, the inner electrode in the center is a graphene / manganese dioxide hybrid fiber, and the outermost layer is pure graphene , The two layers are separated by phosphoric acid / polyvinyl alcohol as the electrolyte to prevent short-circuiting of the internal and external electrodes. Concrete preparation method comprises the following steps:

[0037] (1) Dissolve 0.4g of graphite oxide in 20ml of ultrapure water, and obtain a graphite oxide dispersion with a concentration of 20mg / mL after ultrasonic dispersion;

[0038] (2) Ultrasonic disperse 0.22g of manganese chloride tetrahydrate in 40mL of isopropanol, add 0.12g of potassium permanganate and 4ml of deionized water at 84°C after 30min and stir, condense and reflux for 30min to room temperature to obtain manganese nanorods. And it is that the ratio of 1:15 is joined in the graphite oxide dispersion liquid w...

Embodiment 3

[0042] A graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor, the capacitor has a three-layer structure, the inner electrode in the center is a graphene / manganese dioxide hybrid fiber, and the outermost layer is pure graphene , The two layers are separated by phosphoric acid / polyvinyl alcohol as the electrolyte to prevent short-circuiting of the internal and external electrodes. Concrete preparation method comprises the following steps:

[0043] (1) Dissolve 0.2g of graphite oxide in 20ml of ultrapure water, and obtain a graphite oxide dispersion with a concentration of 10mg / mL after ultrasonic dispersion;

[0044] (2) Ultrasonic disperse 0.135g of manganese chloride tetrahydrate in 25mL of isopropanol, add 0.075g of potassium permanganate and 2.5ml of deionized water at 83°C after 30 minutes and stir, condense and reflux for 30 minutes to room temperature to obtain di Manganese oxide nanorods. And it is that the ratio of 1:20 is joined in the graphite o...

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Abstract

The invention relates to a graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor and preparation and application thereof. The capacitor has a three-layer structure. The inner electrode in the center is graphene / manganese dioxide hybrid fiber, and the outer layer is pure graphene. The two layers are separated by phosphoric acid / polyvinyl alcohol as electrolyte. The preparation methods includes preparation of graphite oxide dispersion, preparation of manganese dioxide nanorods, preparation of graphite oxide / manganese dioxide hybrid fibers, and preparation of graphene / manganesedioxide-based asymmetric coaxial fiber supercapacitors. The supercapacitor has high bulk energy density and good flexibility. The preparation process is simple and the cost is low, the graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor is expected to be used in the fields of flexible energy storage and wearable devices.

Description

technical field [0001] The invention belongs to the field of supercapacitors and their preparation and application, in particular to a graphene / manganese dioxide-based asymmetric coaxial fiber supercapacitor and its preparation and application. Background technique [0002] With the development of electronic products, especially the emergence of flexible wearable electronic products such as Google glasses, flexible display screens, bendable mobile phones and smart clothing, wearable devices have been widely recognized as the next hot spot in the smart terminal industry. However, the biggest shortcoming of these flexible smart devices is weak battery life, that is, insufficient energy storage. As a new type of energy storage device, supercapacitor has attracted much attention. It has outstanding characteristics such as simple "sandwich" structure, high energy density, reliable cycle stability and safety, and is very suitable for energy storage systems of flexible electronic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/26H01G11/46H01G11/36H01G11/84D01F1/10D01F9/08
CPCD01F1/10D01F9/08H01G11/24H01G11/26H01G11/36H01G11/46H01G11/84Y02E60/13
Inventor 李耀刚吴桂青王宏志侯成义张青红
Owner DONGHUA UNIV
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