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Preparation method for carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with nitrogen

A technology of sodium ion battery and negative electrode material, applied in the field of electrochemistry, can solve the problems of poor conductivity, limited wide application, low capacity, etc., and achieve the effects of easy operation, low cost and simple method

Active Publication Date: 2017-08-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single iron nitride has poor conductivity and low capacity under high current. These shortcomings greatly limit its wide application. Therefore, it is necessary to find a material with good conductivity and compound it to improve its conductivity.

Method used

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  • Preparation method for carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with nitrogen
  • Preparation method for carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with nitrogen
  • Preparation method for carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with nitrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Dissolve urea, polyvinylpyrrolidone PVP and ferric ammonium oxalate in deionized water at a mass ratio of 40:1:10, stir evenly, add 6g of urea to every 40mL of deionized water, and freeze-dry it for 12 hours, the product is Gel, denoted as A;

[0031] 2) Put A in a vacuum tube furnace pyrolysis reaction, Ar gas is the protective gas, the pyrolysis temperature is 400°C, the reaction time is 3h, the heating method is gradient heating, and the temperature is raised to 200°C at a heating rate of 5°C / min. ℃, keep warm for 0.5h, then rise to the final pyrolysis temperature at 10℃ / min for reaction, and record the obtained product as B;

[0032] 3) The above-mentioned preparation B product was washed three times with deionized water and ethanol respectively, and unstable products were removed to obtain a nitrogen-doped carbon-supported iron nitride composite sodium-ion battery negative electrode material.

[0033] see figure 1 , the resulting product particles were analyze...

Embodiment 2

[0037] 1) Dissolve melamine, chitosan and ferric acetate in deionized water at a mass ratio of 40:1:40, stir evenly, add 6g of melamine per 40mL of deionized water, and then freeze-dry it for 12 hours, and the product is a gel shape, denoted as A;

[0038] 2) Put A in a vacuum tube furnace pyrolysis reaction, Ar gas is the protective gas, the pyrolysis temperature is 800°C, the reaction time is 1h, the heating method is gradient heating, and the temperature is raised to 300°C at a heating rate of 10°C / min , keep warm for 0.5h, then rise to the final pyrolysis temperature at 15°C / min for reaction, and record the obtained product as B;

[0039] 3) The above-mentioned preparation B product was washed three times with deionized water and ethanol respectively, and unstable products were removed to obtain a nitrogen-doped carbon-supported iron nitride composite sodium-ion battery negative electrode material.

Embodiment 3

[0041] 1) Dissolve melamine, chitosan and ferric acetate in deionized water at a mass ratio of 40:1:20, stir evenly, add 6g of urea to every 40mL of deionized water, and freeze-dry it for 12 hours, the product is gel shape, denoted as A;

[0042] 2) Put A in a vacuum tube furnace pyrolysis reaction, Ar gas is the protective gas, the pyrolysis temperature is 600°C, the reaction time is 2h, the heating method is gradient heating, and the temperature is raised to 300°C at a heating rate of 5°C / min , keep warm for 0.5h, then rise to the final pyrolysis temperature at 10°C / min for reaction, and record the obtained product as B;

[0043]3) The above-mentioned preparation B product was washed three times with 80° C. deionized water and ethanol respectively to remove unstable products, that is, a nitrogen-doped carbon-supported iron nitride composite sodium-ion battery negative electrode material was obtained.

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Abstract

The invention discloses a preparation method for a carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with nitrogen. The preparation method comprises the steps of firstly, dissolving a nitrogen source, a carbon source and an iron source in deionized water according to a mass ratio being 40:1:(10-40), and performing uniform stirring, wherein 6g nitrogen source is added into the deionized water per 40mL; secondly, freezing and drying the mixture to obtain a product A; thirdly, performing pyrolysis reaction on the product A to obtain a product B; and finally, washing the product B with the deionized water and ethyl alcohol, thereby obtaining the carbon-loaded iron nitride compound sodium ion battery negative electrode material doped with the nitrogen. The product is prepared from a conventional and cheap compound by a one-step pyrolysis method, the method is simple, is low in cost and is easy to operate, and mass production is expected to be achieved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a preparation method of a nitrogen-doped carbon-loaded iron nitride composite sodium-ion battery negative electrode material. Background technique [0002] Due to the advantages of high energy density, long service life, and environmental friendliness, lithium-ion batteries have become a research hotspot in recent years and have been successfully commercialized. However, due to the small reserves of metallic lithium on the earth and the uneven distribution, the price of lithium is high and the cost is high. In order to reduce costs, sodium-ion batteries have become a recent research hotspot, due to the high reserves of sodium resources on the earth and their wide distribution. Nitride of iron (Fe 2 N,Fe 3 N) has the advantages of high stability, low cost, wide range of sources, non-toxicity, and existing graphite electrodes (372mAhg -1 ) compared with (Mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/58H01M4/625H01M10/054Y02E60/10
Inventor 李嘉胤齐慧曹丽云黄剑锋李春光陈文卓杜欣怡程娅伊
Owner SHAANXI UNIV OF SCI & TECH
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