Method for preparing nano-tin/carbon composite nanofibers by electrospinning technology

Abstract

The invention discloses a method for preparing nano tin / carbon composite nanofibers through the electrospinning technology. The method includes the steps that first, stannous chloride, polymethyl methacrylate and polyacrylonitrile are prepared into composite nanofibers through the electrospinning technology; then calcination is conducted under the nitrogen atmosphere, so that the polyacrylonitrile is carbonized, SnCl2 is decomposed, the polymethyl methacrylate is subjected to pyrolysis, accordingly, a porous structure is formed, and the nano tin / carbon composite nanofibers are obtained. The method has the advantages that the preparation technology is simple, the reaction condition is easy to control, and the repetitive rate is high; obtained Sn particles are only 1-2 nm and are evenly inlaid N-doped porous carbon nanofibers, and the mass percent of the Sn can reach 60-65%. The composite material is of a three-dimensional net structure which is formed by interweaving nanofibers from the microcosmic view, the composite material can be directly used as the negative electrode of a sodium-ion battery without a binding agent, high electrochemistry sodium storage reversible capacity can be achieved, excellent rate capability and cycling stability are achieved, and the application prospect is very bright.

Description

technical field [0001] The invention relates to the preparation of negative electrode materials for sodium ion batteries, in particular to a method for preparing nano-tin / carbon composite nanofibers by using electrospinning technology. Background technique [0002] With the continuous development and progress of society, the problems of lack of traditional chemical energy and environmental degradation are becoming more and more prominent. As a new type of environmentally friendly energy, secondary batteries have attracted widespread attention from the world. Under the current development trend of new energy, how to promote the application of secondary batteries in large-scale energy storage such as electric vehicles and smart grids has become a topic of worldwide attention. However, due to the lack of lithium resources (the abundance in the earth's crust is less than 0.0007%), the uneven distribution and high prices of lithium-ion batteries, which are currently developing ra...

AI Technical Summary

Problems solved by technology

However, due to the lack of lithium resources (the abundance in the earth's crust is less than 0.0007%), the uneven distribution and high prices of lithium-ion batteries, which are currently developing rapidly, limit their further development.

Therefore, the preparation of nano-tin / carbon composites is an effective way to improve the performance of tin-sodium storage, but so far, there have been no public reports on tin-based sodium anodes that can meet industrial production standards.

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