Preparation method of nitrogen-doped porous carbon coated silicon composite nanofibers

A composite nanofiber, nitrogen-doped porous carbon technology, applied in microfiber electrodes, active material electrodes, electrical components, etc., can solve the problems of easy introduction of impurity ions and harsh operating conditions, and achieve simple and reliable production processes and equipment. Effects with low requirements and simple operating conditions

Active Publication Date: 2021-02-19
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Problems solved by technology

[0006] In view of the harsh operating conditions and easy introduction of impurity ions in the method of coating polypyrrole by in-situ polymerization of nanofibers, the preparation method of the present inven...

Method used

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Embodiment approach

[0033] According to some embodiments provided by the present invention, the preparation method of the nitrogen-doped porous carbon-coated silicon composite nanofiber comprises the steps of:

[0034] (1) Electrospinning: The polymer binder, nano-silicon and solvent are mixed according to the mass ratio of 1-15:1:3-200 to obtain a spinning solution, and the spinning solution is subjected to electrospinning to obtain a precursor Nanofibers; the polymer binder includes any one or a combination of polyvinylpyrrolidone, polyethylene oxide, polyvinyl alcohol, polyacrylonitrile, polymethacrylate or polystyrene; the solvent Including any one or combination of ethanol, acetic acid, ethylene glycol, n-butanol, N,N-dimethylformamide, chloroform or ether;

[0035] (2) In-situ polymerization coating polypyrrole: adsorb iodine simple substance on the surface of the precursor nanofiber, and then adsorb pyrrole monomer to obtain a composite nanofiber. The ratio is 1:1-6. When the pyrrole mono...

Embodiment 1

[0039] In this embodiment, the preparation method of nitrogen-doped porous carbon-coated silicon composite nanofibers comprises steps:

[0040] Electrospinning process: Add 0.2g of polyvinylpyrrolidone and 1g of polyacrylonitrile into 8.8g of solvent N,N-dimethylformamide and stir until clear, then add 0.1g of silicon powder particles with a particle size of 50 nm and stir evenly to obtain a spinning solution. Then, get 8 milliliters of above-mentioned spinning liquids and pour in the syringe of 10 milliliters, set electrospinning parameter as: spinning voltage 20kV, receiving distance is 15cm, solution extrusion rate 8mL / h, carries out electrospinning then, in Precursor nanofibers containing silicon nanoparticles / polyvinylpyrrolidone / polyacrylonitrile are collected on the surface of the collector.

[0041] In-situ polymerization coating polypyrrole process: Take 0.5g of the above-mentioned precursor nanofibers and 1g of iodine simple substance in the upper layer of the...

Embodiment 2

[0044] Referring to the preparation of nitrogen-doped porous carbon-coated silicon composite nanofibers in Example 1, the difference between this example and Example 1 is that the silicon nanoparticles in the electrospinning process are adjusted to 0.2g, and the rest of the operations remain unchanged , to obtain composite nanofiber-2 of nitrogen-doped porous carbon-coated silicon nanoparticles.

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a preparation method of nitrogen-doped porous carbon coated silicon composite nanofibers. The method comprises the followingsteps: (1) electrostatic spinning: mixing a polymer binder, nano silicon powder and a solvent to obtain a spinning solution, and carrying out electrostatic spinning to obtain a precursor nanofiber membrane; (2) in-situ polymerization coating of polypyrrole: adsorbing elemental iodine on the surface of the precursor nanofiber membrane by a gas phase method, then adsorbing a pyrrole monomer, and carrying out a polymerization reaction to obtain composite nanofibers; (3) heat treatment: calcining the composite nanofibers in a protective atmosphere. According to the preparation method, polypyrrolecoating is more uniform in the gas-phase adsorption in-situ polymerization polypyrrole coating process, uniform nitrogen-doped porous carbon coated silicon particle composite nanofibers are obtained after heat treatment, and the method is simple, convenient and reliable in production process, cheap and easily available in raw materials, low in equipment requirement and easy to realize large-scaleproduction.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of nitrogen-doped porous carbon-coated silicon composite nanofibers. Background technique [0002] Silicon is considered to be the next-generation lithium-ion battery anode material with broad application prospects due to its high specific capacity and low lithium intercalation potential. However, the huge volume change of the silicon anode during charge and discharge not only changes the material structure, but also It brings a variety of negative effects, causing rapid failure of the battery. Carbon materials have high electronic conductivity, which provides a good conductive network for composite materials; the carbon coating layer can restrain and buffer the volume expansion of silicon, prevent the agglomeration of nano-silicon and electrolyte penetration, and form a stable interface and SEI film , so carbon materials are considered to be the best ma...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M10/0525
CPCH01M4/386H01M4/628H01M4/625H01M10/0525H01M2004/027H01M2004/022H01M2004/021Y02E60/10
Inventor 夏振宇谌庆春彭果戈胡三元杨远博周政何凤荣
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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