Bismuth selenide/carbon nanofiber composite anode material for sodium ion battery and preparation method thereof

A technology of carbon nanofibers and sodium-ion batteries, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of composite materials without bismuth selenide and carbon nanofibers Material technology and other issues to achieve the effect of low cost, good ion transmission capacity, and developed pore structure

Inactive Publication Date: 2015-11-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, in the prior art, there is no technology to combine bismuth selenide materials with carbon nanofibers to prepare c

Method used

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  • Bismuth selenide/carbon nanofiber composite anode material for sodium ion battery and preparation method thereof
  • Bismuth selenide/carbon nanofiber composite anode material for sodium ion battery and preparation method thereof
  • Bismuth selenide/carbon nanofiber composite anode material for sodium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Get 7.3g of cetyltrimethylammonium bromide (CTAB) and 13.7g of ammonium persulfate (APS) and dissolve in the cooled 120mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 40min, then slowly add 8.3 mL of pyrrole monomer was reacted at 0-5°C for 24 hours, the product was washed with deionized water and hydrochloric acid solution, and dried at 80°C to obtain polypyrrole fibers; take 1g of polypyrrole fibers and 3g of potassium hydroxide and mix them uniformly in an inert atmosphere Under protection, the temperature was raised to 800°C at a heating rate of 5°C / min, and carbon nanofibers were obtained after holding for 3 hours; 0.5g of carbon nanofibers and 0.5g of elemental selenium were evenly mixed, and at a heating rate of 2°C / min, Raise the temperature to 260°C for heat treatment, keep it warm for 12h, take 0.024g product and add it to 40mL bismuth salt solution (1.25g / L), ultrasonic for 30min, 160°C hydrothermal reaction for 10h, the produc...

Embodiment 2

[0045] Take 3.65g of cetyltrimethylammonium bromide (CTAB) and 6.85g of ammonium persulfate (APS) and dissolve them in a cooled 80mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 30min, then slowly add 4.2 mL of pyrrole monomer, react at 0-5°C for 14 hours, wash the product with deionized water and hydrochloric acid solution, and dry at 80°C to obtain polypyrrole fibers; take 1g of polypyrrole fibers and 4g of potassium hydroxide and mix them uniformly, Under protection, the temperature was raised to 1000°C at a heating rate of 5°C / min, and carbon nanofibers were obtained after holding for 2 hours; 0.4g of carbon nanofibers and 0.6g of elemental selenium were evenly mixed, and at a heating rate of 2°C / min, Raise the temperature to 260°C for heat treatment, keep it warm for 12h, take 0.020g product and add it to 40mL bismuth salt solution (1.25g / L), ultrasonic for 40min, 180°C hydrothermal reaction for 12h, the product is washed with deionized wa...

Embodiment 3

[0049] Take 4.87g of cetyltrimethylammonium bromide (CTAB) and 9.13g of ammonium persulfate (APS) and dissolve them in a cooled 100mL hydrochloric acid solution (1mol / L), stir evenly under ice bath conditions for 30min, then slowly add 5.53 mL of pyrrole monomer was reacted at 0-5°C for 18 hours, the product was washed with deionized water and hydrochloric acid solution, and dried at 80°C to obtain polypyrrole fibers; take 1g of polypyrrole fibers and 3.5g of potassium hydroxide and mix them uniformly in an inert Under the protection of the atmosphere, the temperature was raised to 900°C at a heating rate of 5°C / min, and carbon nanofibers were obtained after holding for 3 hours; 0.5g of carbon nanofibers and 0.5g of elemental selenium were evenly mixed, and the , after heat treatment at 300°C, keep warm for 10h, take 0.039g product and add it to 40mL bismuth salt solution (2g / L), ultrasonic for 60min, hydrothermal reaction at 160°C for 14h, product washed with deionized water a...

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Abstract

The invention discloses a bismuth selenide/carbon nanofiber composite anode material for a sodium ion battery and a preparation method thereof. The composite anode material is obtained by reacting a bismuth salt with small-molecule elemental selenium deposited in carbon nanofibers having a three-dimensional net structure and performing in-situ growth of bismuth selenide. The preparation method comprises the following steps of: firstly, preparing polypyrrole fibers by a template method; secondly, carrying out high-temperature activation on the polypyrrole fibers with the presence of a potassium hydroxide activator to obtain carbon nanofibers having the three-dimensional net structure; thirdly, uniformly mixing the carbon nanofibers with the elemental selenium and carrying out heat treatment; fourthly, dispersing the heat-treatment product in a bismuth salt solution through ultrasound treatment; finally, introducing the mixture into a high-pressure reaction kettle and carrying out hydrothermal reaction to obtain the bismuth selenide/carbon nanofiber composite anode material. The preparation method is simple, safe and reliable, is high in operability and low in cost, and is applicable for industrial production, and the composite material prepared according to the preparation method is endowed with favorable electrochemical performance when used for the sodium ion battery.

Description

technical field [0001] The invention relates to a preparation method of a bismuth selenide / carbon nanofiber negative electrode material used for a sodium ion battery, and belongs to the field of sodium ion batteries. Background technique [0002] The high specific capacity and long service life of lithium batteries make them widely used in portable electronic devices, electric vehicles and plug-in hybrid electric vehicles. The demand for lithium batteries continues to increase, but the rising price and limited reserves of lithium have become bottlenecks in mass production and large-scale commercialization. Sodium is rich in reserves and low in cost, so it has received widespread attention, and sodium-ion batteries have come into being. Like lithium-ion batteries, the development of sodium-ion batteries also requires the development of positive and negative electrode materials. The ionic radius (0.102nm) of Na-ion batteries is 55% larger than that of Li-ions (0.76nm), which...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/587H01M4/62B82Y30/00
CPCB82Y30/00H01M4/364H01M4/581H01M4/587H01M4/625H01M10/054Y02E60/10
Inventor 张治安赵星星张娟
Owner CENT SOUTH UNIV
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