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Preparation method of SnO2/C fiber

A fiber, mixed fiber technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor conductivity, large volume change, poor cycle stability, etc., to achieve high specific capacity, uniform surface distribution, design simple method effect

Active Publication Date: 2016-06-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that tin dioxide-based materials face problems such as large volume changes during charge and discharge and poor conductivity, resulting in poor cycle stability and poor rate performance, which limit their practical applications in energy storage.

Method used

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  • Preparation method of SnO2/C fiber
  • Preparation method of SnO2/C fiber
  • Preparation method of SnO2/C fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of SiO 2 / PAN / PVP mixed fiber:

[0029] Dissolve 0.76g of PVP in 4mL of DMF solution and stir until uniform to obtain a DMF dispersion of PVP.

[0030] 1.52g of SiO 2 Added to 4mL DMF solution, sonicated for 1h to make SiO 2 Evenly dispersed to obtain SiO 2 DMF solution.

[0031] SiO 2 Add the DMF solution of PVP into the DMF dispersion of PVP, stir and mix evenly, then add 0.76g PAN in portions, stir for 4-5h until a transparent colloid is formed, and then the mixed spinning solution is obtained.

[0032] Inject the mixed spinning solution into a 10mL syringe equipped with a needle with an inner diameter of 6mm, place it on an electrospinning machine, set a voltage of 15kV, a distance between the needle and a receiving plate of 15cm, and a spray speed of 0.2mm / min for electrospinning, and obtain SiO 2 / PAN / PVP mixed fiber.

[0033] (2) Preparation of SiO 2 / C fiber:

[0034] Take the SiO prepared above 2 / PAN / PVP mixed fibers were placed in a...

Embodiment 2

[0040] (1) Preparation of SiO 2 / PAN / PVP mixed fiber:

[0041]Dissolve 0.76g of PVP in 4mL of DMF solution and stir until uniform to obtain a DMF dispersion of PVP.

[0042] 1.52g of SiO 2 Added to 4mL DMF solution, sonicated for 1h to make SiO 2 Evenly dispersed to obtain SiO 2 DMF solution.

[0043] SiO 2 Add the DMF solution of PVP into the DMF dispersion of PVP, stir and mix evenly, then add 0.76g PAN in portions, stir for 4-5h until a transparent colloid is formed, and then the mixed spinning solution is obtained.

[0044] Inject the mixed spinning solution into a 10mL syringe equipped with a needle with an inner diameter of 6mm, place it on the electrospinning machine, set the voltage at 15kV, the distance between the needle and the receiving plate is 15cm, and the spray speed is 0.2mm / min for electrospinning, and obtain SiO 2 / PAN / PVP mixed fiber.

[0045] (2) Take the SiO prepared above 2 / PAN / PVP mixed fiber is placed in a vacuum tube furnace, pre-filled with...

Embodiment 3

[0051] (1) Preparation of SiO 2 / PAN / PVP mixed fiber:

[0052] Dissolve 0.76g of PVP in 4mL of DMF solution and stir until uniform to obtain a DMF dispersion of PVP.

[0053] 1.52g of SiO 2 Added to 4mL DMF solution, sonicated for 1h to make SiO 2 Evenly dispersed to obtain SiO 2 DMF solution.

[0054] SiO 2 Add the DMF solution of PVP into the DMF dispersion of PVP, stir and mix evenly, then add 0.76g PAN in portions, stir for 4-5h until a transparent colloid is formed, and then the mixed spinning solution is obtained.

[0055] Inject the mixed spinning solution into a 10mL syringe equipped with a needle with an inner diameter of 6mm, place it on the electrospinning machine, set the voltage at 15kV, the distance between the needle and the receiving plate is 15cm, and the spray speed is 0.2mm / min for electrospinning, and obtain SiO 2 / PAN / PVP mixed fiber.

[0056] (2) Preparation of SiO 2 / C fiber:

[0057] Take the SiO prepared above 2 / PAN / PVP mixed fiber is place...

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Abstract

The invention discloses a preparation method of SnO2 / C fiber, which relates to the technical field of preparation of a transition metal oxide and carbon fiber composite electrode material applied to a lithium ion battery. According to the preparation method provided by the invention, an electrostatic spinning method is used, SiO2 is used as a pore-forming agent, and the pore-forming agent is mixed with PAN and PVP for performing electrostatic spinning to form a composite fiber. After high-temperature calcination and carbonization, the obtained nitrogen-doped multiporous carbon fiber is mixed with certain proportion of SnCl4.5H2O and urea, and the SnO2 / C fiber is prepared through a microwave method. Diameter of the prepared SnO2 / C fiber is 1mm, and inside of the prepared SnO2 / C fiber is a hollow structure formed after SiO2 is removed. The SnO2 / C fiber prepared through the preparation method provided by the invention not only has uniform surface distribution, but also has high specific capacity when being used as a lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of a transition metal oxide and carbon fiber composite electrode material applied to a lithium ion battery. Background technique [0002] SnO2-based negative electrode material with high specific capacity (theoretical specific capacity 782mAhg -1 ), simple preparation process, and extensive resources have attracted extensive attention from lithium-ion battery researchers. However, studies have found that tin dioxide-based materials face problems such as large volume changes and poor conductivity during charge and discharge, resulting in poor cycle stability and poor rate performance, which limit their practical applications in energy storage. Aiming at the problem of its poor cycle stability, changing its morphology, coating, doping and other means can effectively improve the conductivity of tin dioxide, which can solve the problem of poor cycle stability to a certain extent. Nitrogen-doped ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/362H01M4/483H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 范磊倪向颖杨莉徐祥东
Owner YANGZHOU UNIV
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