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Application of fluorographene in secondary sodium battery

A technology of fluorinated graphene and fluorinated graphite, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as poor power characteristics, heat generation, battery volume expansion, etc., achieve good cycle characteristics, and realize the effect of recycling

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 transport characteristics, resulting in many defects in its electrochemical characteristics, such as discharge is usually accompanied by battery volume expansion and heat generation, and the inevitable shortcomings such as poor power characteristics [J.McBreen, et al.New approaches to the design of polymer and liquid electrolytes for lithium batteries[J].J.Power Sources89(2000)163-167]

Method used

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  • Application of fluorographene in secondary sodium battery
  • Application of fluorographene in secondary sodium battery
  • Application of fluorographene in secondary sodium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 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

[0033] 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

[0035] 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 application of fluorographene in a secondary sodium battery. A fluorographene cathode of the secondary sodium battery is prepared by the following steps of subjecting graphite fluoride to a thermal intercalation layer with chloroform and then forming halogen bonds between fluorine atoms and chlorine atoms in order to convert some C-F bonds 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 fluorographene; and adding a conductive agent and an adhesive into the fluorographene according to a certain ratio. The secondary sodium battery adopting the fluorographene 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 fluorographene containing the semi-ionic C-F bonds is a novel cathode material of the secondary sodium battery.

Description

[0001] The application of the present invention is a divisional application of the parent application "fluorinated graphene containing carbon-fluorine semi-ionic bonds and a secondary sodium battery using it as the positive electrode". The filing date of the parent application is May 13, 2014. The number is 2014102017736. technical field [0002] 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 [0003] 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 hotspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/054
CPCH01M4/5835H01M10/054Y02E60/10
Inventor 封伟李瑀冯奕钰
Owner TIANJIN UNIV
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