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A carbon fiber/boron nitride flexible composite electrode and its preparation method and application

A boron nitride flexible and composite electrode technology, applied in the direction of fiber chemical characteristics, battery electrodes, circuits, etc., can solve the problems of reducing the electrochemical performance and flexibility of batteries, reducing the conductivity of electrode materials, etc., to improve electrochemical performance and improve Conductivity, the effect of high conductivity

Active Publication Date: 2021-01-29
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In general, electrode materials need to be mixed with conductive agents and binders, however, the added binder will inevitably reduce the conductivity of electrode materials, thereby reducing the electrochemical performance and flexibility of the battery

Method used

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  • A carbon fiber/boron nitride flexible composite electrode and its preparation method and application
  • A carbon fiber/boron nitride flexible composite electrode and its preparation method and application
  • A carbon fiber/boron nitride flexible composite electrode and its preparation method and application

Examples

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Embodiment 1

[0047] A method for preparing a carbon fiber / boron nitride flexible composite electrode, the steps are as follows:

[0048] (1) Preparation of polyamic acid / boron nitride spinning slurry:

[0049]Prepare the raw materials 4,4'-diaminodiphenyl ether, N,N-dimethylacetamide solvent and pyromellitic anhydride for the synthesis of polyamic acid according to a certain mass volume ratio, and then polyamic acid / boron nitride Prepare a certain amount of boron nitride based on the quality of the spinning slurry; dissolve 4,4'-diaminodiphenyl ether in N,N-dimethylacetamide solvent, add nitrogen to the above mixed solution Boron, add pyromellitic anhydride after ultrasonic treatment for a certain period of time, and continue to stir until the viscosity no longer increases; after the pyromellitic anhydride is completely dissolved, continue stirring the mixture for a certain period of time to obtain polyamic acid / boron nitride Spinning size (PAAsolution);

[0050] (2) Preparation of polya...

Embodiment 2

[0055] This embodiment provides a carbon fiber / boron nitride flexible composite electrode, and the doping amount of boron nitride is 1-10% of the mass of the carbon fiber / boron nitride flexible composite electrode.

[0056] The preparation method steps of the carbon fiber / boron nitride flexible composite electrode provided in this example with a boron nitride doping amount of 1-10% are as follows:

[0057] (1) Preparation of polyamic acid / boron nitride spinning slurry:

[0058] According to the mass volume ratio of 1.5g: 15ml: 1.64g, prepare the raw materials 4,4'-diaminodiphenyl ether, N,N-dimethylacetamide solvent and pyromellitic anhydride for the synthesis of polyamic acid, and then use polyamide Based on the quality of the acid / boron nitride spinning slurry, boron nitride with a doping amount of 1 to 10% is prepared, and the boron nitride is a boron nitride nanosheet with a particle size of 50 to 70 nm; the 4,4' - Dissolve diaminodiphenyl ether in N,N-dimethylacetamide s...

Embodiment 3

[0064] This embodiment provides a carbon fiber / boron nitride flexible composite electrode, and the doping amount of boron nitride is 3% of the mass of the carbon fiber / boron nitride flexible composite electrode.

[0065] The steps of the preparation method of the carbon fiber / boron nitride flexible composite electrode provided in this example with a boron nitride doping amount of 3% are as follows:

[0066] (1) Preparation of polyamic acid / boron nitride spinning slurry:

[0067] Prepare 1.5g of 4,4'-diaminodiphenyl ether, 15ml of N,N-dimethylacetamide solvent and 1.64g of pyromellitic anhydride as raw materials for the synthesis of polyamic acid, and then spin polyamic acid / boron nitride Prepare the boron nitride with a doping amount of 3% based on the quality of the silk slurry, and the boron nitride is a boron nitride nanosheet with a particle size of 50-70nm; 4,4'-diaminodiphenyl ether is dissolved in In the N, N-dimethylacetamide solvent, add boron nitride to the above mi...

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Abstract

The invention belongs to the technical field of flexible electrodes, and in particular relates to a carbon fiber / boron nitride flexible composite electrode and its preparation method and application, wherein the doping amount of boron nitride is 1 to 10% of the mass of the flexible composite electrode. 4,4'-diaminodiphenyl ether, N,N-dimethylacetamide solvent, pyromellitic anhydride and boron nitride to prepare polyamic acid / boron nitride spinning slurry, and then use electrospinning The polyamic acid / boron nitride nanofiber is obtained, and the polyamic acid / boron nitride nanofiber is cured and carbonized to obtain a carbon fiber / boron nitride flexible composite electrode. The carbon fiber / boron nitride flexible composite electrode of the present invention has no binder, can be directly used as the negative electrode material of the lithium ion battery, shows high electrical conductivity, good cycle stability, flexibility, structural stability and mechanical strength, can be It can be bent in any direction without breaking under repeated bending, while ensuring the safety of the battery and keeping its capacity unaffected.

Description

technical field [0001] The invention belongs to the technical field of flexible electrodes, in particular to a carbon fiber / boron nitride flexible composite electrode and its preparation method and application. Background technique [0002] Lithium-ion batteries (LIBs) are widely used in electronic devices and hybrid electric vehicles due to their excellent properties such as high energy density, long cycle life, no memory effect, and environmental friendliness. With the development of bendable electronic devices and stretchable integrated circuits, the requirements for lithium-ion batteries are also getting higher and higher. These flexible electronic devices require Li-ion batteries to be lighter, thinner, more flexible, and miniaturized, so the research and development of flexible electrode materials for Li-ion batteries is on the rise. [0003] Generally, electrode materials need to be mixed with conductive agents and binders, however, the added binders will inevitably ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525D01F9/10
CPCD01F9/10H01M4/362H01M4/58H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈明华张守志张家伟陈庆国
Owner HARBIN UNIV OF SCI & TECH
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