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Tin/carbon composite nanofiber material for sodium battery negative electrode and preparation method of tin/carbon composite nanofiber material

A carbon nanofiber and nanofiber technology, which is applied in the field of tin/carbon composite nanofiber material for sodium battery negative electrode and its preparation, can solve the problems of poor battery cycle stability, destruction of material structural integrity, volume expansion and shrinkage, etc. , to achieve the effect of good rate performance, excellent cycle stability and good crystallinity

Inactive Publication Date: 2017-06-30
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.
However, as an electrode material, Sn will experience serious volume expansion and contraction during the process of alloying and separating with larger sodium ions during charging and discharging of the battery, and the huge change in its volume will seriously damage the structure of the material. Integrity, which makes the material broken and separated, which leads to the rapid decay of battery capacity and makes the battery cycle stability worse

Method used

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  • Tin/carbon composite nanofiber material for sodium battery negative electrode and preparation method of tin/carbon composite nanofiber material
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  • Tin/carbon composite nanofiber material for sodium battery negative electrode and preparation method of tin/carbon composite nanofiber material

Examples

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Effect test

Embodiment 1

[0039] A method for preparing tin / carbon composite nanofiber material for the negative electrode of a sodium battery includes the following steps:

[0040] (1) Precursor solution preparation: Weigh 0.7 g of polyacrylonitrile and 9 g of DMF in a beaker to prepare a 10% polyacrylonitrile solution, and after sealing, use a heating stirring table to stir at a constant temperature at 60°C 2 h to obtain a light yellow transparent solution, add 0.2 g of stannous chloride dihydrate, turn off the heating device of the stirring table, and stir for 12 h at room temperature to obtain a transparent and uniform solution;

[0041] (2) Electrospinning method to prepare nanofiber membrane: the solution obtained in step (1) is used as the spinning solution into a syringe with a flat stainless steel needle, the inner diameter of the stainless steel needle is 0.7 mm; The syringe of the silk liquid is installed on the syringe pump, and the electrostatic spinning parameters are set. The electrostatic vo...

Embodiment 2

[0051] A method for preparing tin / carbon composite nanofiber material for the negative electrode of a sodium battery includes the following steps:

[0052] (1) Precursor solution preparation: Weigh 0.6 g of polyacrylonitrile and 10 g of DMF in a beaker to prepare a polyacrylonitrile solution with a mass fraction of 5%. After sealing, use a heating stirring table to stir at a constant temperature at 50°C 3 h, get a light yellow transparent solution, add 0.3 g of stannous chloride dihydrate, turn off the heating device of the stirring table, and stir at room temperature for 15 h to obtain a transparent and uniform solution;

[0053] (2) Electrospinning method to prepare nanofiber membranes: the solution obtained in step (1) is used as spinning solution into a syringe with a flat-necked stainless steel needle, the inner diameter of the stainless steel needle is 0.6 mm; The syringe of the silk liquid is installed on the syringe pump, and the electrostatic spinning parameters are set. T...

Embodiment 3

[0060] A method for preparing tin / carbon composite nanofiber material for the negative electrode of a sodium battery includes the following steps:

[0061] (1) Precursor solution preparation: Weigh 0.8 g of polyacrylonitrile and 8 g of DMF in a beaker, prepare a 15% polyacrylonitrile solution, seal it and stir at a constant temperature at 80℃ with a heating stirring table 1 h, get a light yellow transparent solution, add 0.15 g of stannous chloride dihydrate, turn off the heating device of the stirring table, and stir at room temperature for 10 h to obtain a transparent and uniform solution;

[0062] (2) Electrospinning method to prepare nanofiber membrane: the solution obtained in step (1) is used as the spinning solution into a syringe with a flat stainless steel needle, the inner diameter of the stainless steel needle is 0.8 mm; The syringe of silk liquid is installed on the syringe pump, and the electrostatic spinning parameters are set. The electrostatic voltage between the sp...

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Abstract

The invention provides a tin / carbon composite nanofiber material for a sodium battery negative electrode and a preparation method of the tin / carbon composite nanofiber material. The tin / carbon composite nanofiber material is prepared from carbon nanofibers and tin nanoparticles; carbon accounts for 30%-60% of the tin / carbon composite nanofiber material in percentage by mass, and tin accounts for 40%-70% of the tin / carbon composite nanofiber material in percentage by mass; the carbon nanofibers are nitrogen-doped carbon nanofibers; the carbon nanofiber structure is long and continuous; the tin nanoparticles are uniformly attached to surfaces of the carbon nanofibers. The tin / carbon composite nanofiber material serving as a sodium battery anode material has good reversible capacity and circulatory stability. Furthermore, the preparation method of the tin / carbon composite nanofiber material for the sodium battery negative electrode is provided, the tin / carbon composite nanofiber material is synthesized through electrostatic spinning, the process is simple, raw materials are widely sourced, and the cost is lower.

Description

Technical field [0001] The invention relates to the preparation of a negative electrode material of a sodium battery, in particular to a tin / carbon composite nanofiber material for the negative electrode of a sodium battery and a preparation method thereof. Background technique [0002] With the continuous development and progress of society, the problems of the lack of traditional chemical energy and the deterioration of the environment that people are facing have become more and more prominent. As a new type of environmentally friendly energy source, secondary batteries have received widespread attention from the world. [0003] 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 world attention. However, the current rapid development of lithium-ion batteries is due to the lack of lithium resources (the abundance in the earth's crust i...

Claims

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Application Information

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IPC IPC(8): D01F9/22D01F9/21D01F1/10D04H1/728D04H1/4382D01D5/00H01M4/36
CPCD01D5/003D01D5/0069D01D5/0092D01F1/10D01F9/21D01F9/22D04H1/4382D04H1/728H01M4/362Y02E60/10
Inventor 孙旭辉沙漠
Owner SUZHOU UNIV
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