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Sandwich structure monolithic self-supporting carbon fluoride electrode material and preparation method thereof

A self-supporting carbon fluoride and structural carbon fluoride technology, applied in structural parts, battery electrodes, circuits, etc., can solve the problems of reduced wetting performance of pole pieces and electrolyte, and reduced lithium ion transmission and diffusion speed. Conducive to the effect of fast transmission, improving high-rate discharge, and high electronic conductivity

Active Publication Date: 2020-05-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the pole piece is extruded, the wettability between the pole piece and the electrolyte decreases, and the transmission and diffusion speed of lithium ions inside the active material structure decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 0.6g of 2-aminothiazole in a mixed solution consisting of 6ml of deionized water and 9ml of absolute ethanol, stir evenly, add 0.4g of F127, and stir until dissolved. Add 5ml 5mg ml -1graphene oxide, and stir evenly. Add 1.5ml of formaldehyde solution, stir well and then add 0.2ml of phosphoric acid. After sealing the reaction system, put it into 100° C. for aging for 4 hours. Polymer samples were pre-frozen and freeze-dried at -40°C. Then under nitrogen protection, carbonization at 800°C for 2h, a sandwich structure monolithic carbon material was prepared. Prepare the carbon material in 30ml min -1 f 2 Fluorination treatment at 400° C. for 20 hours was carried out under the flow rate to obtain a monolithic fluorinated carbon material with a sandwich structure. The prepared sandwich structure self-supporting monolith "porous fluorinated carbon / graphene / porous fluorinated carbon" has a fluorine content of 57% by mass, and has surface chemical properties mo...

Embodiment 2

[0036] Dissolve 0.9g of 2-aminopyrimidine in a mixed solution consisting of 10ml of deionized water and 15ml of absolute ethanol, stir evenly, add 0.6g of CTAB, and stir until dissolved. Add 10ml 5mg ml -1 graphene oxide, and stir evenly. Add 2ml of formaldehyde solution, stir well and then add 0.5ml of glacial acetic acid. After sealing the reaction system, put it into 100° C. for aging for 4 hours. Polymer samples were pre-frozen and freeze-dried at -40°C. Then, carbonization was carried out at 800°C for 2 h under the nitrogen protective gas condition, and a sandwich-structure monolithic carbon material was prepared. Prepare the carbon material in 20ml min -1 f 2 Fluorination treatment at 450° C. for 10 hours was carried out under the flow rate to obtain a monolithic fluorinated carbon material with a sandwich structure. The specific surface area of ​​the obtained material is 410m2g-1, the mass percentage of fluorine is 56%, and the mass percentage of heteroatom nitrog...

Embodiment 3

[0038] Dissolve 1.2g of 2-aminothiazole in a mixed solution consisting of 10ml of deionized water and 15ml of absolute ethanol, stir well, add 0.9g of F127, and stir until dissolved. Add 8ml 8mg ml -1 graphene oxide, and stir evenly. Add 3ml of formaldehyde solution, stir well and then add 0.4ml of glacial acetic acid. After sealing the reaction system, put it into 100° C. for aging for 6 hours. Polymer samples were pre-frozen and freeze-dried at -40°C. Then, carbonization was carried out at 800°C for 2 h under the nitrogen protective gas condition, and a sandwich-structure monolithic carbon material was prepared. Prepare the carbon material in 20ml min -1 f 2 Fluorination treatment at 500° C. for 10 h under flow rate to obtain a monolithic fluorinated carbon material with a sandwich structure.

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Abstract

The invention relates to a sandwich-structure integral self-supporting carbon fluoride electrode material and a preparation method thereof. The material is a sandwich-structure "porous carbon fluoride / graphene / porous fluoride carbon" integral self-supporting carbon fluoride electrode material , which is composed of porous carbon fluoride with adjustable thickness on both sides of graphene. The preparation method is based on the rapid polymerization of Schiff bases in the catalytic reaction mechanism, and the sandwich structure of "heteroatom modified porous carbon / graphene / heteroatom modified porous carbon" is prepared by using the interaction between the reaction system and graphene oxide The self-supporting monolithic carbon material, combined with the precisely regulated fluorination treatment technology, prepares the self-supporting monolithic "porous fluorinated carbon / graphene / porous fluorinated carbon" electrode material with a sandwich structure. The preparation method of the invention is simple to operate, and can realize the controllable preparation of integral electrode materials.

Description

technical field [0001] The invention belongs to the field of novel carbon fluoride material preparation and battery application thereof, and in particular relates to a sandwich-structured integral self-supporting carbon fluoride electrode material and a preparation method thereof. Background technique [0002] Fluorinated carbon is a covalent interlayer compound composed of two elements, carbon and fluorine, and its chemical formula is (CFx) n , as a positive electrode active material and metal lithium negative electrode to form a battery system, the theoretical specific energy is as high as 2180Wh kg -1 . Lithium fluoride batteries have the advantages of large specific capacity, wide operating temperature range, good stability, high safety and long service life, and are widely used in portable electronic equipment, electronic instruments, chip memory power supplies, implanted medical devices, etc. application. Although the lithium fluoride carbon battery has high energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/583H01M4/139
CPCH01M4/139H01M4/362H01M4/582H01M4/583Y02E60/10
Inventor 陈剑郭德才陶韬孙春水
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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