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A kind of c/si/cnts composite carbon nanofiber membrane, preparation method and application thereof

A technology of composite nanofibers and nanofiber membranes, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of unsatisfactory electrochemical energy storage performance, electrical contact loss, attenuation, etc., to improve cycle stability, The effect of reducing capacity fade

Active Publication Date: 2022-05-06
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

However, when it is used as the negative electrode of lithium-ion batteries, its electrochemical energy storage performance is still not ideal.
Due to the poor dispersion of semiconductor nano-Si particles, in silicon / carbon composite nanofibers, some Si particles and their aggregates are obviously exposed; these Si particles and their aggregates exposed on the fiber surface are easier to peel off from the fiber surface, thus Causes loss of electrical contact, deactivation of active material and rapid capacity fading

Method used

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  • A kind of c/si/cnts composite carbon nanofiber membrane, preparation method and application thereof
  • A kind of c/si/cnts composite carbon nanofiber membrane, preparation method and application thereof
  • A kind of c/si/cnts composite carbon nanofiber membrane, preparation method and application thereof

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Embodiment 1

[0043] A method for preparing a carbon (C) / silicon (Si) / carbon nanotube (CNTs) composite carbon nanofiber membrane, the specific steps of the method are as follows:

[0044] (1) Preparation of PAN / Si / CNTs composite nanofiber membrane by electrospinning:

[0045] Preparation of spinning solution: mix polyacrylonitrile (PAN) powder, silicon powder (Si) and ferrous sulfate particles, dissolve them in dimethylformamide (DMF), stir at 80 °C for 12 hours, and obtain a solid content of PAN of 8% and evenly dispersed spinning solution. In the spinning solution, based on the mass of PAN as 100%, the content of Si is 25%, and the content of ferrous sulfate is 15%.

[0046] Electrospinning: Put the spinning solution obtained above and the magnetic stirring rotor together in the syringe, set the distance between the needle and the aluminum foil receiver to 15cm, spin the voltage to 15kV, and continue spinning for 6h to obtain 1.2μm PAN / Si / Fe composite nanofibrous membrane.

[0047] (2) ...

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Abstract

The invention relates to a composite carbon nanofiber membrane, in particular to a C / Si / CNTs composite carbon nanofiber membrane, a preparation method and an application thereof, and belongs to the technical field of energy storage system materials. First, the PAN / Si / Fe composite nanofiber membrane was prepared by electrospinning. On this basis, carbon nanotubes (CNTs) were grown on the Fe active sites by chemical vapor deposition (CVD), and then passed High-temperature carbonization to prepare C / Si / CNTs composite carbon nanofiber membrane. The energy storage performance of Li-ion battery energy storage devices was investigated. Among them, the CNTs grown on the PAN base can effectively alleviate the volume expansion of the silicon negative electrode. Using the C / Si / CNTs composite carbon nanofiber film provided by the present invention as the negative electrode of the lithium-ion battery significantly reduces the capacity decay of the lithium-ion battery and improves the The cycle stability of the battery.

Description

technical field [0001] The invention relates to a composite carbon nanofiber membrane, in particular to a C / Si / CNTs composite carbon nanofiber membrane, a preparation method and an application thereof, and belongs to the technical field of energy storage system materials. Background technique [0002] In recent years, energy shortage and sustainable utilization of renewable new energy have become hot spots in social research. The problem of energy storage in the continuous utilization of new energy makes energy storage materials a new research hotspot. On the one hand, as a safe and low-cost electrochemical energy storage device, lithium-ion batteries have been widely used in electric vehicles, portable energy storage devices, etc. Silicon (Si) because of its high theoretical capacity (4200mAhg -1 ), low working potential and abundance in nature are expected to be high-capacity anodes for Li-ion batteries. However, its huge volume expansion (~300%) during lithiation and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 胡毅张亚茹程钟灵
Owner ZHEJIANG SCI-TECH UNIV
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