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Preparation method for carbon/tin/graphene composite nanofibers for lithium ion battery

A graphene composite and lithium-ion battery technology, which is applied in the field of nanomaterials and chemical power sources, can solve problems that have not been seen before, and achieve the effects of high specific capacity, excellent electrochemical properties, and good rate characteristics

Inactive Publication Date: 2016-11-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no relevant reports on the preparation of carbon / tin / graphene composite nanofibers for lithium-ion battery anode materials by electrospinning and high-temperature carbonization technology.

Method used

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  • Preparation method for carbon/tin/graphene composite nanofibers for lithium ion battery
  • Preparation method for carbon/tin/graphene composite nanofibers for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 3g of PAN and dissolve it in 27g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, to prepare a DMF solution with a mass fraction of PAN of 10%. Weigh 1.5g of stannous chloride and 0.15g of graphene and add them to the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / SnCl 2 / graphene composite nanofiber membrane, the spinning voltage is 20kV, the receiving distance is 20cm, and the spinning speed is 1mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 250° C. at a heating rate of 2° C. / min in an air atmosphere, and the temperature was maintained for 2 h. Afterwards, the temperature was raised to 800° C. for carbonization und...

Embodiment 2

[0021] Weigh 3g of PAN and dissolve it in 27g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, to prepare a DMF solution with a mass fraction of PAN of 10%. Weigh 1.5g of stannous chloride and 0.15g of graphene and add them to the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / SnCl 2 / graphene composite nanofiber membrane, the spinning voltage is 15kV, the receiving distance is 25cm, and the spinning speed is 0.5mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 300° C. at a heating rate of 4° C. / min in an air atmosphere, and the temperature was maintained for 2 h. Afterwards, the temperature was raised to 600° C. for carbonization u...

Embodiment 3

[0023] Weigh 3g of PAN and dissolve it in 27g of DMF, put it into a stirrer, adjust the appropriate speed, and stir at room temperature for 12-24 hours until uniform, to prepare a DMF solution with a mass fraction of PAN of 10%. Weigh 1.5g of stannous chloride and 0.15g of graphene and add them to the above DMF solution, put them into a stirrer, adjust the appropriate speed, stir at room temperature for 8-10 hours, and ultrasonically oscillate for 1-3 hours to form a uniform solution. Spinning using an electrospinning device to obtain PAN / SnCl 2 / graphene composite nanofiber membrane, the spinning voltage is 18kV, the receiving distance is 22cm, and the spinning speed is 0.8mL / h. The obtained composite nanofiber membrane was put into a tube furnace, and the temperature was raised from room temperature to 300° C. at a heating rate of 5° C. / min in an air atmosphere, and the temperature was maintained for 3 hours. Afterwards, the temperature was raised to 700° C. for carbonizat...

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Abstract

The invention discloses a preparation method for carbon / tin / graphene composite nanofibers for a lithium ion battery, and belongs to the technical fields of nanomaterials and a chemical power supply. The preparation method comprises the steps of dissolving polyacrylonitrile, stannous chloride and graphene into N, N-dimethylformamide, and stirring uniformly to form a spinning solution; then preparing a polyacrylonitrile / stannous chloride / graphene composite nanofiber membrane through an electrospinning technique; and carrying out carbonization to obtain the carbon / tin / graphene composite nanofiber negative electrode material. The preparation process provided by the invention is simple, and the production cost is low; the composite nanofiber material prepared by the invention is used for the negative electrode material of the lithium ion battery, and the material has an excellent electrochemical property, a good cycling performance and high rate capability; the shortcoming of a poor cycling performance of a tin-based negative electrode material is overcome; and therefore, the carbon / tin / graphene composite nanofibers, which can used as the new generation of the negative electrode material of the lithium ion battery, can be widely applied in portable equipment.

Description

technical field [0001] The invention relates to a preparation method for negative electrode materials of lithium ion batteries, in particular to a method for preparing carbon / tin / graphene composite nanofibers by electrospinning, and belongs to the technical field of nanomaterials and chemical power sources. Background technique [0002] In today's era, the concept of sustainable development has increasingly become the consensus of mankind. The massive use of fossil fuels represented by the three main energy sources of coal, oil, and natural gas has brought enormous pressure to the ecological environment. And with the depletion of resources, the development and utilization of renewable clean energy is particularly important today. Due to the advantages of high open circuit voltage, large specific capacity, low self-discharge rate, long life, and no memory effect, lithium-ion batteries have become representatives of modern high-performance and clean energy, and are widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/1395B82Y40/00
CPCY02E60/10
Inventor 乔辉陈克费雅倩罗磊魏取福
Owner JIANGNAN UNIV
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