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Preparation method of ZnSnO3 hollow nanofibers

A hollow nano-fiber technology, applied in nanotechnology, fiber processing, hollow filament manufacturing, etc., can solve the problems of poor efficiency and cycle performance, achieve long cycle life, high specific capacity, and reduce performance degradation.

Inactive Publication Date: 2020-06-12
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although compared with ZnO ZnSnO 3 The field-effect electron mobility is three times larger than that of ZnO and the volume expansion rate is smaller than that of ZnO, but due to the 3 During the electrochemical test, the efficiency and cycle performance of the material will still be deteriorated due to volume expansion, so how to improve the ZnSnO 3 The electrochemical performance of materials is one of the research hotspots

Method used

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  • Preparation method of ZnSnO3 hollow nanofibers
  • Preparation method of ZnSnO3 hollow nanofibers
  • Preparation method of ZnSnO3 hollow nanofibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of ZnSnO for lithium ion battery 3 The preparation method of hollow nanofiber comprises the following steps:

[0023] a, 0.3g tin protochloride and 0.1812g zinc chloride are dissolved in the mixed solution of 6g dehydrated alcohol and 4g DMF, then add 1g PVP wherein, obtain the required spinning solution of electrospinning;

[0024] b. Preparation of ZnCl by electrospinning 2 / SnCl 2 / PVP precursor fiber, the voltage is 20kV, the solution injection speed is 0.4ml / h, the spinning speed is 90r / min, the receiving distance is 15cm, and the electrospinning temperature is 20°C;

[0025] c. After drying the obtained fibers at 80°C for 12 hours, in a box-type resistance furnace, heat up to 650°C at a heating rate of 2°C / min for sintering for 2 hours, and then cool at a cooling rate of 1°C / min to obtain ZnSnO 3 Hollow nanofibers.

[0026] With the ZnSnO that embodiment 1 makes 3 Hollow nanofibers were detected by XRD and microscopic morphology analysis. Depend on f...

Embodiment 2

[0028] A kind of ZnSnO for lithium ion battery 3 The preparation method of hollow nanofiber comprises the following steps:

[0029] a, 0.15g stannous chloride and 0.0906g zinc chloride are dissolved in the mixed solution of 3g dehydrated alcohol and 2g DMF, then add 0.5g PVP wherein, obtain the required spinning solution of electrospinning;

[0030] b. Preparation of ZnCl by electrospinning 2 / SnCl 2 / PVP precursor fiber, the voltage is 10kV, the solution injection speed is 0.1ml / h, the spinning drum speed is 80r / min, the receiving distance is 5cm, and the electrospinning temperature is 0°C;

[0031] c. After drying the obtained fibers at 50°C for 2 hours, in a box-type resistance furnace, heat up to 500°C at a heating rate of 0.5°C / min for sintering for 2 hours, and then cool at a cooling rate of 0.5°C / min to obtain ZnSnO 3 Hollow nanofibers.

Embodiment 3

[0033] A kind of ZnSnO for lithium ion battery 3 The preparation method of hollow nanofiber comprises the following steps:

[0034] A, 1.5g stannous chloride and 0.906g zinc chloride are dissolved in the mixed solution of 21g dehydrated alcohol and 14g DMF, then add 3.5g PVP wherein, obtain the required spinning solution of electrospinning;

[0035] b. Preparation of ZnCl by electrospinning 2 / SnCl 2 / PVP precursor fiber, the voltage is 25kV, the solution injection speed is 0.6ml / h, the spinning drum speed is 300r / min, the receiving distance is 25cm, and the electrospinning temperature is 40°C;

[0036] c. After drying the obtained fibers at 120°C for 24 hours, in a box-type resistance furnace, heat up to 750°C at a heating rate of 5°C / min for sintering for 4 hours, and then cool at a cooling rate of 5°C / min to obtain ZnSnO 3 Hollow nanofibers.

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Abstract

The invention discloses a preparation method of ZnSnO3 hollow nanofibers, which is characterized by comprising the following steps: (a) dissolving stannous chloride and zinc chloride in a mixed solution of absolute ethyl alcohol and DMF, and adding PVP into the mixed solution to obtain a solution required by electrostatic spinning; (b) preparing a ZnCl2 / SnCl2 / PVP precursor fiber through an electrostatic spinning method; and (c) drying the obtained fibers, sintering the fibers at 500-750 DEG C, and cooling the fibers to obtain the ZnSnO3 hollow nanofibers. The grain size of the ZnSnO3 preparedby the method is 50-100nm and is greatly reduced according to the nano effect, so that the electrochemical performance of the ZnSnO3 material can be improved by increasing the specific surface area;due to the fact that the ZnSnO3 material has an obvious hollow structure, enough space can be provided in the electrochemical performance testing process, large volume changes can be buffered, and theproblem of performance reduction caused by volume expansion is solved. When the ZnSnO3 material is used for a lithium battery, the ZnSnO3 material has high specific capacity, long cycle life and excellent rate capability.

Description

technical field [0001] The invention belongs to the field of nanofibers, specifically a ZnSnO 3 Preparation method of hollow nanofiber. Background technique [0002] With the gradual depletion of traditional fossil fuels and increasingly serious environmental problems, the application range of high-performance chemical power sources is becoming more and more extensive. Due to its high energy density and power density, lithium-ion batteries are widely used in scientific research and industry. ZnSnO 3 It is a multifunctional ternary metal oxide with a perovskite structure. Because it has a higher theoretical specific capacitance (1317mAh g -1 ), low operating voltage, abundant reserves and other advantages, it is now used as a negative electrode material for lithium-ion batteries with great potential. Although compared with ZnO ZnSnO 3 The field-effect electron mobility is three times larger than that of ZnO and the volume expansion rate is smaller than that of ZnO, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/00B82Y40/00D01F9/08D01D5/00D01D5/24H01M4/48H01M10/0525
CPCB82Y40/00C01G19/00C01P2004/16C01P2004/64D01D5/003D01D5/0061D01D5/24D01F9/08H01M4/483H01M10/0525H01M2004/027Y02E60/10
Inventor 董松涛韦俊霖张亚梅郭宇航汪蕾
Owner JIANGSU UNIV OF SCI & TECH
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