Heteroatom-modified fluorinated carbon quantum and preparation method thereof

A technology of carbon fluoride and carbon heterofluoride, which is applied in the preparation of new carbon fluoride materials and its battery applications, can solve the problems of not being able to increase the solid phase diffusion rate of lithium ions, and achieve excellent rate performance and high discharge specific capacity Effect

Active Publication Date: 2019-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the above modification does not significantly change the structure of the carbon fluoride material, and cannot increase the solid-phase diffusion rate of lithium ions between the layers of the carbon fluoride material, so the improvement of the discharge rate performance of the carbon fluoride material is limited.

Method used

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  • Heteroatom-modified fluorinated carbon quantum and preparation method thereof
  • Heteroatom-modified fluorinated carbon quantum and preparation method thereof

Examples

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Embodiment 1

[0020] Take 1.0g of glucose, dissolve it in a mixed solution of 100ml of deionized water and 200ml of absolute ethanol, stir evenly, add 0.01g of boric acid, and stir until dissolved. The reaction system was put into a microwave-assisted synthesis reactor for microwave-assisted polymerization, the microwave power was 600W, and the total reaction time was 6h. After the reaction, the sample was filtered and dried at 60°C. Then, under the condition of nitrogen protective gas, carbonize at 600°C for 2h, and then 1200V for 1h to prepare boron-containing carbon quantum dot materials. The prepared carbon material was subjected to fluorination treatment at 200° C. for 4 hours under the flow rate of 50 ml min-1 F2 to obtain a boron-doped fluorinated carbon quantum dot material. The fluorine content of the prepared material is 58wt%, and the content of heteroatom boron is 2wt.%. The discharge specific capacity of 1.5V cut-off voltage is 810mAh g-1, and the discharge voltage is 2.15V. ...

Embodiment 2

[0022] Take 1.0g of aniline, dissolve it in a mixed solution of 100ml of deionized water and 200ml of absolute ethanol, stir well, add 0.01g of ferric chloride, add 0.005ml of phosphoric acid, and stir until dissolved. Put the reaction system into a microwave-assisted synthesis reactor for microwave-assisted polymerization, the microwave power is 500W, and the total reaction time is 5h. After the reaction, the sample was filtered and dried at 60°C. Then, under the condition of nitrogen protective gas, carbonize at 600°C for 2h, and then at 1200°C for 1h to prepare nitrogen-containing carbon quantum dot materials. The prepared carbon material was subjected to fluorination treatment at 250° C. for 4 hours at a flow rate of 10 ml min-1 F2 to obtain a nitrogen-phosphorus-doped fluorinated carbon quantum dot material. The mass percentage of fluorine in the prepared material is 55wt.%, the mass percentage of heteroatom nitrogen is 1.5wt.%, and the mass percentage of heteroatom phos...

Embodiment 3

[0024] Take 1.0g of pyrrole, dissolve it in a mixed solution of 100ml of deionized water and 200ml of absolute ethanol, stir evenly, add 0.01g of ferric chloride, add 0.005ml of boric acid, and stir until dissolved. The reaction system was put into a microwave-assisted synthesis reactor for microwave-assisted polymerization, the microwave power was 300W, and the total reaction time was 4h. After the reaction, the sample was filtered and dried at 60°C. Then, under the condition of nitrogen protective gas, carbonize at 600°C for 2h, and then at 1200°C for 1h to prepare nitrogen-containing carbon quantum dot materials. The prepared carbon material was subjected to fluorination treatment at 400° C. for 4 hours at a flow rate of 20 ml min-1 F2 to obtain a nitrogen-boron-doped fluorinated carbon quantum dot material. The mass percentage of fluorine in the prepared material is 60wt.%, the mass percentage of nitrogen is 1.5wt.%, and the mass percentage of boron is 2wt.%. The F / C mola...

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Abstract

The invention relates to a preparation method for preparing a carbon fluoride quantum dot of a high-specific capacity and low-dimensional fluorinated carbon material. Small organic molecules are polymerized with a chemical solution method and a microwave-assisted mode, the heteroatom-modified carbon quantum dot material is obtained through carbonization and graphitization, and the heteroatom-modified fluorinated carbon quantum dot material is prepared by precise and controllable fluorination technology.

Description

technical field [0001] The invention belongs to the field of preparation of novel carbon fluoride materials and battery applications thereof, and in particular relates to a heteroatom-doped carbon fluoride quantum dot material and a preparation method thereof. Background technique [0002] Traditional fluorinated carbon is a covalent interlayer compound composed of two elements, carbon and fluorine, and its chemical formula is (CFx)n. The traditional preparation method is to prepare fluorinated graphite by fluorinating graphite with fluorine gas or fluorine-containing substances. Fluorinated carbon materials can be used as positive electrode materials for lithium primary batteries, and combined with metal lithium negative electrodes to form lithium fluorinated carbon batteries. Lithium fluoride carbon battery has the highest theoretical specific energy of about 2180Wh / kg for a primary battery. The fluorinated carbon material prepared by the traditional method is the fluori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/36H01M6/14B82Y30/00B82Y40/00
Inventor 郭德才陈剑
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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