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Battery based on fluorine doped graphene nanosheets

A graphene nanosheet, fluorine doping technology, applied in the field of materials, to achieve the effect of simple doping process

Inactive Publication Date: 2018-12-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A few days ago, we reported the preparation method of fluorine-doped graphene containing C-F half-ionic bonds (CN2014102017736), but the controllable synthesis of fluorine-doped graphene with specific fluorine-containing groups has not been reported

Method used

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  • Battery based on fluorine doped graphene nanosheets
  • Battery based on fluorine doped graphene nanosheets
  • Battery based on fluorine doped graphene nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use reduced graphene oxide and ethanol as raw materials to prepare rGN ethanol dispersion with a concentration of 1 mg / ml, add 1 mL of hydrofluoric acid, and mix well by ultrasonication for 10 minutes, then pour the mixture into 50 mL of polytetrafluoroethylene-lined water In the hot kettle, use a muffle furnace to heat the hydrothermal kettle to 150° C. for 24 hours. After the hydrothermal kettle was naturally cooled to room temperature, the solution was taken out and centrifuged at 10000rmp for 20min with a centrifuge, and the obtained powder was redispersed in deionized water and ethanol, and centrifuged several times until the pH of the aqueous solution reached neutral. Then the obtained powder was suction-filtered, placed in a vacuum oven, and dried at 60°C for 24 hours to obtain -CF 2 Fluorine-doped graphene nanosheets (F-rGO).

Embodiment 2

[0026] Use reduced graphene oxide and ethanol as raw materials to prepare rGN ethanol dispersion with a concentration of 2 mg / ml, add 5 mL of hydrofluoric acid, and mix well by ultrasonication for 10 minutes, then pour the mixture into 50 mL of polytetrafluoroethylene-lined water In the hot kettle, use a muffle furnace to heat the hydrothermal kettle to 120° C. for 36 hours. After the hydrothermal kettle was naturally cooled to room temperature, the solution was taken out and centrifuged at 8000rmp for 20 minutes with a centrifuge, and the obtained powder was redispersed in deionized water and ethanol, and centrifuged several times until the pH of the aqueous solution reached neutral. Then the obtained powder was suction-filtered, placed in a vacuum oven, and dried at 60°C for 24 hours to obtain -CF 2 Fluorine-doped graphene nanosheets (F-rGO).

Embodiment 3

[0028] Use reduced graphene oxide and ethanol as raw materials to prepare rGN ethanol dispersion with a concentration of 3 mg / ml, add 10 mL of hydrofluoric acid, and mix well by ultrasonication for 10 minutes. In the hot kettle, use a muffle furnace to heat the hydrothermal kettle to 180° C. for 12 hours. After the hydrothermal kettle was naturally cooled to room temperature, the solution was taken out and centrifuged at 10000rmp for 20min with a centrifuge, and the obtained powder was redispersed in deionized water and ethanol, and centrifuged several times until the pH of the aqueous solution reached neutral. Then the obtained powder was suction-filtered, placed in a vacuum oven, and dried at 60°C for 24 hours to obtain -CF 2 Fluorine-doped graphene nanosheets (F-rGO).

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Abstract

The invention discloses a battery based on fluorine doped graphene nanosheets. A preparation method comprises following steps: reduced oxidized graphene is uniformly dispersed in ethanol, hydrofluoricacid is added, an obtained mixture is introduced into a reaction vessel, and is heated to 120 to 180 DEG C for reaction; after reaction, an obtained product is cooled to a room temperature ranging from 20 to 25 DEG C through natural cooling so as to obtain the fluorine doped graphene nanosheets taking -CF2 as a main component, and the fluorine doped graphene nanosheets is taken as an anode material in assembling of the battery. The reduced oxidized graphene, hydrofluoric acid, and the like are taken as raw materials, the raw materials are cheap and easily available; the graphene doping technology is simple; large scale production can be realized; and electrical properties are improved obviously.

Description

technical field [0001] The invention belongs to the technical field of materials, and more specifically, relates to a battery based on fluorine-doped graphene nanosheets, with -CF 2 The main fluorine-doped graphene nanosheets were prepared as anode materials. Background technique [0002] Graphene is made of sp 2 A monoatomic layer of ultra-thin two-dimensional crystal material composed of hybridized carbon atoms connected to each other. The carbon atoms are in a hexagonal ring honeycomb shape and connected to each other by covalent bonds. Due to its unique structure, it exhibits many excellent properties, and it is used as an anode material for alkali metal secondary batteries, exhibiting extremely high specific capacity and excellent stability. But most of the active sites that contribute to ion diffusion and electron transport are located in the wrinkled regions of graphene edges. Therefore, for intrinsic graphene materials, the lack of such edge folds and active sites...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/36
CPCH01M4/364H01M4/5835Y02E60/10
Inventor 冯奕钰曹宇封伟李瑀安浩然王伟哲
Owner TIANJIN UNIV
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