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Graphene/MXene composite fiber flexible electrode material based on solid electrolyte and preparation method of knittable supercapacitor

A solid electrolyte and composite fiber technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of sacrificial electrode conductivity and unsatisfactory application of high-performance supercapacitors

Pending Publication Date: 2020-10-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fiber used in this scheme is an insulating organic fiber, which sacrifices part of the conductivity of the electrode, so the application in high-performance supercapacitors is not yet ideal.

Method used

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  • Graphene/MXene composite fiber flexible electrode material based on solid electrolyte and preparation method of knittable supercapacitor
  • Graphene/MXene composite fiber flexible electrode material based on solid electrolyte and preparation method of knittable supercapacitor
  • Graphene/MXene composite fiber flexible electrode material based on solid electrolyte and preparation method of knittable supercapacitor

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Experimental program
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preparation example Construction

[0056] (2) Preparation of graphene oxide: Graphene oxide is prepared by the modified Hummers method, specifically: ① Low-temperature oxidation: take concentrated sulfuric acid and sodium nitrate with a mass ratio of (0.1~1): (10~60) in a beaker , Mechanical stirring at 0~8℃. Then add the expanded graphite prepared in step S1 slowly, then add 2-10g potassium permanganate, stir vigorously for 0.1-2h; ②Medium temperature oxidation: increase the temperature of the magnetic stirrer to 30-50℃ and stir for 0.1-1.5h , Slowly add 50~150ml distilled water dropwise during the reaction; ③High temperature oxidation: increase the temperature of the magnetic stirrer to 70~100℃, and at the same time, after the process of heating, add 100~300mL deionized water and 1~8ml 30% The hydrogen peroxide solution is mechanically stirred, and when the color of the solution changes from brown to bright yellow, the prepared graphene oxide solution is obtained. Afterwards, in order to remove the metal oxid...

Embodiment 1

[0074] Preparation of solid electrolyte graphene / MXene flexible fiber electrode material and supercapacitor

[0075] Step 1: Preparation of expanded graphite: Take 2-8g of concentrated sulfuric acid (98% by mass) and 1-4g of concentrated nitric acid into a beaker, mix and stir with a glass rod. Take 0.1-2g graphite powder and 0.1-2g potassium permanganate slowly add to the mixture. Use a circulating water multipurpose vacuum pump to suction and filter the mixture several times to a pH of 6-7, and then put the product after suction filtration into a vacuum drying oven at 40-80°C to dry to powder. Put the crucible into the muffle furnace and heat it to 700~1000℃, then take it out with crucible tongs, quickly add the dried powder to the crucible and cover the lid (to prevent the expansion of graphite from splashing), and after natural cooling at room temperature, the expanded graphite is obtained .

[0076] Step two, preparation of graphene oxide nanosheets: the modified Hummers met...

Embodiment 2

[0088] Preparation of solid electrolyte graphene / MXene flexible fiber electrode material and supercapacitor

[0089] Step 1: Preparation of expanded graphite: Take 2-8g of concentrated sulfuric acid (98% by mass) and 1-4g of concentrated nitric acid into a beaker, mix and stir with a glass rod. Take 0.1-2g graphite powder and 0.1-2g potassium permanganate slowly add to the mixture. Use a circulating water multipurpose vacuum pump to suction and filter the mixture several times to a pH of 6-7, and then put the product after suction filtration into a vacuum drying oven at 40-80°C to dry to powder. Put the crucible into the muffle furnace and heat it to 700~1000℃, then take it out with crucible tongs, quickly add the dried powder to the crucible and cover the lid (to prevent the expansion of graphite from splashing), and after natural cooling at room temperature, the expanded graphite is obtained .

[0090] Step 2: Preparation of graphene oxide nanosheets: The modified Hummers metho...

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Abstract

The invention relates to a graphene / MXene composite fiber flexible electrode material based on a solid electrolyte and a preparation method of a knittable supercapacitor. High-performance graphene oxide and MXene nanosheets are prepared through an improved Hummers method and an etching method, a macroscopic graphene / MXene composite fiber electrode material is prepared through wet spinning by meansof the liquid crystal self-assembly behavior of the graphene oxide and the MXene nanosheets, and the macroscopic graphene / MXene composite fiber electrode material is assembled into the supercapacitor. The preparation method is simple in process and low in equipment requirement, and the prepared flexible knittable supercapacitor is good in biocompatibility, has excellent electrochemical performance and good flexibility and stretchability, and can be widely applied to the fields of portable and wearable electronic equipment and the like.

Description

Technical field [0001] The invention belongs to the fields of nano energy materials, carbon materials, capacitor technology and the like, and relates to a method for preparing a flexible electrode material based on a solid electrolyte graphene / MXene composite fiber and a woven super capacitor. Background technique [0002] Over the past few decades, with the increasing demand for high-tech electronic products, impressive progress has been made in the development of flexible, lightweight and wearable electronic devices such as electronic skins, smart clothes, displays, and flexible smartphones , These electronic devices are suitable for various applications in sports products, health monitoring and other fields. Generally, the daily work of these wearable electronic devices requires a power storage and power supply system with high capacitance and fast charging rate to support. As a new type of portable and wearable device power supply between traditional capacitors and batteries...

Claims

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Application Information

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IPC IPC(8): H01G11/26H01G11/36H01G11/40H01G11/86
CPCH01G11/26H01G11/36H01G11/40H01G11/86Y02E60/13
Inventor 党阿磊赵曌刘鑫李铁虎方成林赵廷凯李昊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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