Si-TiO2-C nano fiber composite thin film, preparation method and application thereof

A nanofiber membrane, si-tio2-c technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as lattice distortion, lack of channels, affecting battery performance, etc. The effect of improving efficiency

Active Publication Date: 2015-08-12
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Titanium dioxide negative electrode material is cheap, easy to obtain, safe, environmentally friendly and non-polluting. Its lithium insertion efficiency is very high, and it will not cause metal lithium to deposit on the electrode. Therefore, it has become a hotspot in the research of lithium battery negative electrode materials. However, TiO 2 The lack of internal channels in bulk materials greatly reduces the actual capacity and cycle rate of lithium-ion batteries during charging and discharging, and during the insertion and extraction of lithium ions, the lattice of titanium dioxide will be distorted to a certain extent, and the diffusion of lithium ions Limited by the short Ti-O bond, at the same time, the anode material made of nano-titanium dioxide agglomerates during the battery cycle, which affects battery performance

Method used

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  • Si-TiO2-C nano fiber composite thin film, preparation method and application thereof
  • Si-TiO2-C nano fiber composite thin film, preparation method and application thereof
  • Si-TiO2-C nano fiber composite thin film, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Si-TiO 2 Preparation of -C nanofiber composite film:

[0051] Prepare a spinning solution using N,N-dimethylformamide (DMF) as a solvent, wherein the ratio of various raw materials in the spinning solution is: polyacrylonitrile concentration 10wt%, tetrabutyl titanate concentration 1.0mol / L, the concentration of nano silicon powder is 0.3mol / L.

[0052] Next, carry out electrospinning on the above-mentioned spinning solution. The conditions of electrospinning are: the inner diameter of the needle is 1mm, the spinning voltage is 12kV, the receiving method is drum receiving, the flow rate of the spinning solution is 0.5mL / h, and the receiving distance is 20cm. After 3 hours, the electrospun nanofiber precursor film was obtained.

[0053] Then, the obtained electrospun nanofiber precursor film was subjected to pre-oxidation treatment, and the process was firstly kept at 120° C. for 1 h, and then kept at 250° C. for 2 h at a constant temperature.

[0054] Finally, the p...

Embodiment 2

[0063] Si-TiO 2 Preparation of -C nanofiber composite film:

[0064] Prepare a spinning solution using DMSO as a solvent, wherein the ratio of various raw materials in the spinning solution is: polyvinyl alcohol concentration 7wt%, titanic acid concentration 0.1mol / L, nano silicon powder concentration 0.1mol / L.

[0065] Next, carry out electrospinning on the above-mentioned spinning solution, the condition of electrospinning is: inner diameter of the needle head is 0.6mm, spinning voltage is 20kV, receiving mode is drum receiving, flow rate of spinning solution is 0.3mL / h, receiving distance is 30cm, spinning The silk time is 2h, and the electrospun nanofiber precursor film is obtained.

[0066] Then, the obtained electrospun nanofiber precursor film was subjected to pre-oxidation treatment. The process was firstly kept at 100° C. for 2 hours, and then kept at 250° C. for 4 hours.

[0067] Finally, the pre-oxidized electrospun nanofiber precursor film was carbonized in an ar...

Embodiment 3

[0070] Si-TiO 2 Preparation of -C nanofiber composite film:

[0071] Prepare the spinning solution with chloroform as solvent, wherein, the proportioning of various raw materials in the spinning solution is: polyvinylpyrrolidone concentration 15wt%, isopropyl titanate concentration 0.5mol / L, the concentration of nano silicon powder is 0.5mol / L.

[0072] Next, carry out electrospinning on the above-mentioned spinning liquid, the conditions of electrospinning are: the inner diameter of the needle head is 2.0mm, the spinning voltage is 8kV, the receiving mode is drum receiving, the flow rate of spinning liquid is 1.5mL / h, the receiving distance is 10cm, the spinning The silk time is 6 hours, and the electrospun nanofiber precursor film is obtained.

[0073] Then, the obtained electrospun nanofiber precursor film was subjected to pre-oxidation treatment. The process was firstly kept at 100°C for 2h, and then kept at 250°C for 2h.

[0074] Finally, the pre-oxidized electrospun n...

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Abstract

The invention provides a Si-TiO2-C nano fiber composite thin film, a preparation method and an application thereof. The preparation method for preparing the Si-TiO2-C nano fiber composite thin film includes following steps: (1) providing a spinning liquid which contains nano silicon powder, a titanium precursor and a carbon precursor; (2) performing electrostatic spinning to the spinning liquid to prepare a nano fiber film; (3) pre-oxidizing the nano fiber film under an oxygen-containing atmosphere at 100-300 DEG C to obtain a stabilized nano fiber film; and (4) carbonizing the stabilized nano fiber film under an non-oxidizing atmosphere at 500-1000 DEG C to obtain the Si-TiO2-C nano fiber composite thin film. By means of the method, the Si-TiO2-C nano fiber composite thin film can be prepared quickly and effectively. The preparation method is simple in operations, is convenient and quick, and can easily achieve large-scale production.

Description

technical field [0001] The present invention relates to the field of materials, in particular to Si-TiO 2 -C nanofiber composite film and its preparation method and application, more specifically, related to Si-TiO 2 -C nanofiber composite film, preparation of Si-TiO 2 -C nanofiber composite film method, negative electrode for lithium ion battery and lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used because of their high energy density, high average output voltage, small self-discharge, wide operating temperature range, excellent cycle performance, fast charge and discharge, high output power, long service life, and no toxic and harmful substances. . For lithium-ion battery anode materials, various materials that can insert and extract lithium ions, such as carbon materials, silicon-based materials, titanium dioxide, etc., have been used. [0003] Silicon-based negative electrode material is due to its high theoretical capacity (420...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/139B82Y30/00
CPCB82Y30/00H01M4/139H01M4/362H01M10/0525Y02E60/10
Inventor 杨秀娟
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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