Fluorinated graphene containing semi-ionic C-F bonds and secondary sodium battery adopting the fluorinated graphene as the cathode

A technology of fluorinated graphene and fluorinated graphite, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as poor power characteristics, battery expansion, low ion transmission characteristics, etc., achieve good cycle characteristics and realize recycling Effect

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional CF x It is prepared by the high-temperature reaction of carbon and fluorine gas. It is mainly used as the positive electrode of lithium primary batteries. The discharge voltage is between 2-3V, and it shows extremely high theoretical specific capacity and energy density. However, due to the insulation of the C-F covalent bond characteristics and extremely low ion tran

Method used

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  • Fluorinated graphene containing semi-ionic C-F bonds and secondary sodium battery adopting the fluorinated graphene as the cathode
  • Fluorinated graphene containing semi-ionic C-F bonds and secondary sodium battery adopting the fluorinated graphene as the cathode
  • Fluorinated graphene containing semi-ionic C-F bonds and secondary sodium battery adopting the fluorinated graphene as the cathode

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Weigh 20 mg of fluorinated graphite and add it to 100 mL of chloroform, stir at a constant speed for half an hour to disperse the fluorinated graphite in chloroform, then add it into a stainless steel reaction kettle, put the reaction kettle into a muffle furnace, and heat at 150°C for 12 hours. After the end, the resulting suspension was ultrasonicated for 6 hours, and then the ultrasonicated suspension was centrifuged at a speed of 500r / min for 30 minutes to remove the unreacted solids in the lower layer, and the resulting solution was suction-filtered to obtain a filter cake, which was heated at 60°C Under drying, obtain fluorinated graphene material, through X photoelectron energy spectrum analysis wherein the proportion that C-F semi-ionic bond accounts for is 16.7% (that is, in the XPS spectrogram, the integral area corresponding to the peak of C-F semi-ionic bond is the same as the corresponding C-F Semi-ionic bond, corresponding to C-F covalent bond, correspondin...

Embodiment 2

[0031] Weigh 50mg of fluorinated graphite and add it into 100mL of chloroform, stir at a constant speed for half an hour to disperse the fluorinated graphite in chloroform, then add it into a stainless steel reaction kettle, heat at 120°C for 10h, after the heating time is over, ultrasonicate the obtained suspension for 8h, Then the supersonic suspension was centrifuged at a speed of 1000r / min for 30min to remove unreacted solids, and the resulting solution was suction-filtered to obtain a filter cake, which was dried at 60°C to obtain a fluorinated graphene material. Characterized by X-ray photoelectron spectroscopy, the proportion of C-F ionic bonds is 12.3%. Weigh fluorinated graphene, acetylene black and PVDF with a mass ratio of 78:12:10, place them in NMP for wet grinding to prepare a uniform slurry. Spread the ground slurry evenly on the aluminum foil, place it in a blast oven and bake at a certain temperature for 1-2 hours. The baked material was placed in a vacuum ov...

Embodiment 3

[0033] Weigh 60 mg of fluorinated graphite and add it to 100 mL of chloroform, stir at a constant speed for half an hour to disperse the fluorinated graphite in chloroform, then add it into a stainless steel reaction kettle, put the reaction kettle into a muffle furnace, and heat at 90°C for 12 hours. After the end, the obtained suspension was ultrasonicated for 10 hours, and then the ultrasonicated suspension was centrifuged at a speed of 1500r / min for 20 minutes to remove the reacted solids, and the obtained solution was suction-filtered to obtain a filter cake. After drying, the fluorinated graphene material was obtained, and the proportion of C-F ionic bonds was listed as 8.9% through X-ray photoelectron spectroscopy. Weigh fluorinated graphene, acetylene black and PVDF with a mass ratio of 82:8:10, place them in NMP for wet grinding to prepare a uniform slurry. Spread the ground slurry evenly on the aluminum foil, place it in a blast oven and bake at a certain temperature...

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Abstract

The invention discloses fluorinated graphene containing semi-ionic C-F bonds and a secondary sodium battery adopting the fluorinated graphene as the cathode. The fluorinated graphene cathode of the secondary sodium battery is prepared by steps of: subjecting graphite fluoride to thermal intercalation with chloroform so that halogen bonds are formed between fluorine atoms and chlorine atoms, and therefore some C-F bonds convert into the semi-ionic C-F bonds; subjecting the graphite fluoride to ultrasonic stripping; centrifuging to remove the unreacted graphite fluoride raw material; subjecting the superstratum solution after centrifugation to suction filtration to obtain the fluorinated graphene; and adding a conductive agent and an adhesive into the fluorinated graphene according to a certain ratio. The secondary sodium battery adopting the fluorinated graphene containing the semi-ionic C-F bonds as the cathode shows a significant charge-discharge platform, and has advantages of high reversible specific capacity and stable discharging platform. The fluorinated graphene containing the semi-ionic C-F bonds is a novel cathode material of the secondary sodium batter.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and more specifically relates to a fluorinated graphene containing carbon-fluorine semi-ionic bonds, a preparation method and utilization thereof. Background technique [0002] The research and development of energy storage technology has always been a direction that countries around the world have focused on. The development of high-performance energy storage batteries with large capacity, small size, high energy storage and conversion efficiency, long service life and no geographical restrictions has become a research topic in this field. An important hotspot with great economic and social benefits. Among all the cathode materials for energy storage batteries, fluorinated carbon (CF x ) has the highest mass specific capacity, and its mass specific capacity reaches 865mAhg when x=1 -1 . In the 1970s, Panasonic realized the CF x The industrial production, and it has been wide...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/054
CPCH01M4/5835H01M10/054Y02E60/10
Inventor 封伟李瑀冯奕钰
Owner TIANJIN UNIV
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