A bismuth/nitrogen-doped carbon sphere negative electrode composite material for sodium ion battery and preparation method thereof

A technology of sodium ion battery and composite material is applied in the field of negative electrode material of sodium ion battery and its preparation, so as to achieve the effects of improving sodium storage capacity, stable structure and cost saving

Inactive Publication Date: 2017-04-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an emerging negative electrode material, there are few reports on the research and application of bismuth in sodium-ion batteries.

Method used

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  • A bismuth/nitrogen-doped carbon sphere negative electrode composite material for sodium ion battery and preparation method thereof
  • A bismuth/nitrogen-doped carbon sphere negative electrode composite material for sodium ion battery and preparation method thereof
  • A bismuth/nitrogen-doped carbon sphere negative electrode composite material for sodium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Weigh 10g of biuret, 15g of bismuth nitrate pentahydrate and 5g of CTAB into 200mL of deionized water, stir at 25°C for 0.5h until the solution is clear, and obtain a spray pyrolysis solution; The atomization volume of the system is 0.5mL / min, the medium atomization pressure is 1MPa, and the product is collected; the obtained spray product is repeatedly washed with deionized water and absolute ethanol three times, and vacuum-dried at 60°C to obtain bismuth / nitrogen-doped Carbon sphere composite. The bismuth / nitrogen-doped carbon sphere has a particle size of 0.1-10 μm, a nano-bismuth particle size of 5-10 nm, a bismuth content of 65 percent, and a nitrogen content of 2 percent. The bismuth / nitrogen-doped carbon spheres prepared in this example were used as the working electrode, and the sodium was used as the counter electrode, and assembled into a button cell. At a current density of 100mA / g, the cycle performance was tested; Test the rate performance of the battery a...

Embodiment 2

[0031]Weigh 10g of biuret, 30g of bismuth nitrate pentahydrate and 5g of SDS into 200mL of deionized water, stir at 45°C for 0.5h until the solution is clear, and obtain a spray pyrolysis solution; The atomization volume of the system is 1mL / min, the medium atomization pressure is 1MPa, and the product is collected; the obtained spray product is repeatedly washed with deionized water and absolute ethanol three times, and vacuum-dried at 60°C to obtain bismuth / nitrogen-doped carbon ball composite. The particle size of the bismuth / nitrogen-doped carbon sphere is 0.3-7 μm, the size of the nano-bismuth particle is 8-15 nm, the content of bismuth is 78%, and the content of nitrogen is 1.5%. The bismuth / nitrogen-doped carbon spheres prepared in this example were used as the working electrode, and the sodium was used as the counter electrode, and assembled into a button cell. At a current density of 100mA / g, the cycle performance was tested; Test the rate performance of the battery ...

Embodiment 3

[0033] Weigh 10g of biuret, 15g of bismuth chloride and 5g of CTAB into 200mL of deionized water, stir at 30°C for 0.5h until the solution is clear, and prepare a spray pyrolysis solution; spray pyrolysis at 600°C, pass through the spray system The atomization volume is 0.5mL / min, the medium atomization pressure is 1MPa, and the product is collected; the obtained spray product is repeatedly washed with deionized water, absolute ethanol, and acetone for 3 times, and vacuum-dried at 60°C to obtain bismuth / doped Nitrogen carbon sphere composite material. The particle size of the bismuth / nitrogen-doped carbon sphere is 0.2-5 μm, the size of the nano-bismuth particle is 5-10 nm, the content of bismuth is 55%, and the content of nitrogen is 2%. The bismuth / nitrogen-doped carbon spheres prepared in this example were used as the working electrode, and the sodium was used as the counter electrode, and assembled into a button cell. At a current density of 100mA / g, the cycle performance ...

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Abstract

The invention discloses a preparation method for bismuth / nitrogen-doped carbon-sphere composite anode material for a sodium ion battery. According to the preparation method, the bismuth / nitrogen-doped carbon-sphere composite anode material is obtained by carrying out spray pyrolysis on a mixed solution of a nitrogen-containing carbon source, a bismuth precursor, a surfactant and deionized water and then washing and drying the product. In the composite material prepared according to the method, bismuth nanoparticles are uniformly distributed in nitrogen-doped carbon spheres, and the bismuth content accounts for 50-90 percent by mass. The preparation process is simple, is low in cost, is easy to operate and is applicable for implementation in the industry and mass production, and the prepared sodium ion battery anode has the advantages of high mass specific capacity, favorable rate capability and the like.

Description

technical field [0001] The invention relates to a negative electrode material of a sodium ion battery and a preparation method thereof, belonging to the field of sodium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used as an energy storage device in portable electronics, electric vehicles and plug-in hybrid electric vehicles. However, due to the lack of lithium resources and the high cost of lithium-ion batteries, the large-scale commercial application of lithium-ion batteries will face severe challenges. It is imperative to research and develop new battery systems that can be used in large-scale commercial applications. Sodium and lithium are in the same group in the periodic table of elements, and have similar physical and chemical properties to lithium. At the same time, compared with lithium, sodium also has the advantage of abundant reserves (the crustal abundance of lithium is 0.006%, and the crustal abundance of sodium was 2.64...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/587H01M4/36H01M10/054
CPCH01M4/364H01M4/38H01M4/587H01M10/054Y02E60/10
Inventor 张治安杨富华王冠超赖延清
Owner CENT SOUTH UNIV
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