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Flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, preparation method and application thereof

A porous carbon fiber, composite electrode technology, applied in the field of materials science, can solve the problems of electrode material structure collapse, less active sites, low rate performance, etc., and achieve the effect of increasing the interlayer distance, large amount of ions, and high cycle capacity.

Active Publication Date: 2020-05-29
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the intercalation and deintercalation of ions during the charge and discharge process, the large ion radius will easily cause the structure of the electrode material to collapse, resulting in a rapid decline in capacity and a sharp decrease in performance.
[0003] In order to overcome the above problems, the anode materials of most of the current commercialized batteries are mainly carbon materials, which have excellent cycle stability, but have low specific capacity, poor conductivity, low rate performance and relatively low active sites. Less disadvantages, so it is necessary to further improve the electrochemical performance of carbon materials

Method used

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  • Flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, preparation method and application thereof
  • Flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, preparation method and application thereof
  • Flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, preparation method and application thereof

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Effect test

Embodiment 1

[0031] A method for preparing a flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, comprising the steps of:

[0032] (1) Preparation of zinc oxide nanofibers (ZnO@PAN):

[0033] At room temperature, 1.2g ZnO was dissolved in 8mL N,N-dimethylformamide (DMF) and firstly ultrasonicated for 0.5h to obtain a homogeneous solution, then 0.6g PAN powder was added to the above mixed solution and stirred for 6h, followed by electrospinning Instrument, specific parameters Spinning is performed at a voltage of 10kV, a temperature of 25°C, and a bolus injection speed of 0.1mm / min, and finally flexible oxide nanofibers (ZnO@PAN) are obtained.

[0034] (2) Preparation of zinc sulfide nanocarbon fibers (ZnS@NCF):

[0035] The mass ratio of ZnO@PAN and sublimated sulfur is mixed at 1:1. 2 The high-temperature heat treatment was carried out under the atmosphere, and the heating control program was as follows: the temperature was raised to 600°C at a rate of 2°...

Embodiment 2

[0041] A method for preparing a flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, comprising the steps of:

[0042] (1) Preparation of nickel oxide nanofibers (NiO@PAN):

[0043] At room temperature, 1.8g NiO was dissolved in 10mL N,N-dimethylformamide (DMF) and ultrasonicated for 1h to obtain a homogeneous solution, then 0.8g PAN powder was added to the above mixed solution and stirred for 36h, and then electrospinning equipment was used to , the specific parameters were spun at a voltage of 15kV, a temperature of 40°C, and a bolus injection speed of 0.15mm / min, and finally flexible oxide nanofibers (NiO@PAN) were obtained.

[0044] (2) Preparation of zinc sulfide nanocarbon fibers (NiS@NCF):

[0045] Mix NiS@PAN and sublimated sulfur at a mass ratio of 1:2, and perform high-temperature heat treatment in an Ar atmosphere. The heating control program is: the temperature is raised to 700°C at a rate of 4°C / min, and then kept for 3 hours, and f...

Embodiment 3

[0051] A method for preparing a flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material, comprising the steps of:

[0052] (1) Preparation of ferric oxide nanofibers (Fe 2 o 3 @PAN):

[0053] At room temperature, 2.4g Fe 2 o 3 Dissolved in 12mL N,N-dimethylformamide (DMF) and ultrasonicated for 1.5h to obtain a homogeneous solution, then 1.0g PAN powder was added to the above mixed solution and stirred for 24h, then using an electrospinning instrument, the specific parameters were in the voltage Spinning was carried out at 18kV, temperature 50°C and injection speed 0.2mm / min, and finally flexible oxide nanofibers (Fe 2 o 3 @PAN).

[0054] (2) Preparation of zinc sulfide nanocarbon fibers (FeS@NCF):

[0055] Fe 2 o 3 Mix @PAN and sublimed sulfur at a mass ratio of 1:2, and perform high-temperature heat treatment in an argon-hydrogen mixed atmosphere. The heating control program is: the temperature is raised to 800°C at a rate of 5°C / min, and ...

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Abstract

The invention discloses a flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material and a preparation method thereof, and an application in an electrochemical energy storage device. The preparation method comprises the following steps: firstly, taking polyacrylonitrilePAN and metal oxide MOX as raw materials, carrying out electrostatic spinning to obtain flexible oxide nanofiberMOX@PAN; mixing with sublimed sulfur, heating in an inert atmosphere for heat treatment, and naturally cooling to obtain flexible metal sulfide nano carbon fiber MSx@NCF; and finally, etching metal sulfide by using an acid to obtain the flexible sulfur-nitrogen co-doped porous carbon fiber (SNCF) composite electrode material. The flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material obtained by adopting electrostatic spinning, high-temperature treatment and an etching method not only has a large specific surface area, but also enables surface charges to be stored and reacted quickly due to sulfur-nitrogen doping, obviously improves cycling stability of an energy device, and can be used as a lithium, sodium and potassium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of materials science, and in particular relates to a flexible sulfur-nitrogen co-doped porous carbon fiber composite electrode material and its preparation method and application. Background technique [0002] With the rapid development of society, energy and environment are two major issues facing the sustainable development of human beings. Since the 21st century, energy has become a necessary material factor for the rise of a great power. However, non-renewable energy sources such as oil, natural gas, and coal are slowly being exhausted, so the development of renewable clean energy is imminent. So far, rechargeable ion batteries are expected to be a new generation of efficient energy storage devices as a clean energy source. Lithium-ion batteries are not only widely used in various fields such as automobiles, aerospace, and biomedicine because of their advantages such as high specific capacity, long cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/587H01M10/0525H01M10/054
CPCH01M4/364H01M4/5815H01M4/587H01M4/5835H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 陈坚陈达明沈梦瑶
Owner SOUTHEAST UNIV
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