Antimony/nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as carbon source, and preparation method and application thereof

A technology of methyl imidazole dicyandiamide and nitrogen-doped carbon, which is applied in the field of electrode materials, can solve the problems of volume change of antimony, poor cycle stability, loss of electrical contact, etc., and achieves the effects of excellent electrochemical performance and simple process

Active Publication Date: 2017-10-13
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a serious volume change of antimony in the process of deintercalating sodium, which can easily cause antimony particles to pulverize, lose electrical contact, and eventually lead to poor cycle stability.

Method used

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  • Antimony/nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as carbon source, and preparation method and application thereof
  • Antimony/nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as carbon source, and preparation method and application thereof
  • Antimony/nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as carbon source, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of antimony / nitrogen doped carbon composites

[0021] 400 mg of antimony trichloride was weighed and dissolved in 5 mL of methanol to form a clear solution, which was named solution A. Solution B was obtained by dissolving 500 mg of 1-ethyl-3-methylimidazolium dicyanamide ionic liquid in 5 mL of methanol. Pour solution B into solution A under vigorous stirring, and stop stirring after obtaining a uniform solution. After standing for 12 h, the white solid was collected by centrifugation, washed with methanol and centrifuged 5 times. Subsequently, the resulting product was placed in a porcelain boat and transferred to a tube furnace at H 2 / Ar (5:95 v / v) atmosphere, the temperature was raised to 600 °C at a rate of 5 °C / min, and then kept at 600 °C for 2 h to obtain a black antimony / nitrogen-doped carbon composite (Sb@NC).

[0022] (2) Characterization of antimony / nitrogen-doped carbon composites

[0023] The size, morphology and microstructure of the ...

Embodiment 2

[0065] Weigh 400 mg of antimony trichloride and dissolve in 5 mL of methanol to form a clear solution, which is named solution A. 500 mg of 1-ethyl-3-methylimidazolium dicyanamide ionic liquid was dissolved in 5 mL of methanol to obtain solution B. Pour solution B into solution A under vigorous stirring, and stop stirring after obtaining a uniform dispersion. After standing for 12 h, the white solid was collected by centrifugation, washed with methanol and centrifuged 5 times. Subsequently, the resulting product was transferred into a porcelain boat and transferred to a tube furnace at H 2 / Ar (10:90v / v) atmosphere, the temperature was raised to 600°C at a rate of 5°C / min, and then kept at 600°C for 4h to obtain a black antimony / nitrogen-doped carbon composite.

[0066] The structural characterization and electrochemical performance test of the prepared antimony / nitrogen-doped carbon composite were carried out in the same manner as in Example 1, and the results were basicall...

Embodiment 3

[0068] Weigh 450 mg of antimony trichloride and dissolve in 5 mL of methanol to form a clear solution, which is named solution A. Solution B was obtained by dissolving 500 mg of 1-ethyl-3-methylimidazolium dicyanamide ionic liquid in 5 mL of methanol. Pour solution B into solution A under vigorous stirring, and stop stirring after obtaining a uniform dispersion. After standing for 15 h, the white solid was collected by centrifugation, washed with methanol and centrifuged 5 times. Subsequently, the resulting product was placed in a porcelain boat and transferred to a tube furnace at H 2 / Ar (5:95v / v) atmosphere, the temperature was raised to 600°C at a rate of 5°C / min, and then kept at 600°C for 2h to obtain a black antimony / nitrogen-doped carbon composite.

[0069] The structural characterization and electrochemical performance test of the prepared antimony / nitrogen-doped carbon composite were carried out in the same manner as in Example 1, and the results were basically the...

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Abstract

The invention provides a preparation method of an antimony/nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as a carbon source. The preparation method comprises the steps of dissolving antimony trichloride and 1-ethyl-3-methylimidazole dicyanamide into methyl alcohol separately, mixing under strong stirring to enable the two kinds of solutions to be fully mixed and then standing, next, performing centrifuging and collecting gel-shaped white solid body, and performing centrifuging and washing by methyl alcohol; and performing carbonization on the obtained product in H<2>/Ar atmosphere to obtain the antimony/nitrogen-doped carbon compound. The invention also provides the antimony/nitrogen-doped carbon compound prepared by the method and an application of the compound as a negative electrode material of a sodium ion battery. Antimony trichloride, ionic liquid and 1-ethyl-3-methylimidazole dicyanamide ionic liquid are taken as the raw materials, and simple process, green and environment friendly raw materials, and batch production are realized favorably; and the prepared antimony/nitrogen-doped carbon compound has excellent electrochemical performance, and can be used as the ideal negative electrode material of the sodium ion battery to replace hard carbon with low reversible capacity to be applied to the sodium ion battery.

Description

technical field [0001] The present invention relates to an electrode material, in particular to an antimony / nitrogen-doped carbon composite prepared by using 1-ethyl-3-methylimidazolium dicyanamide as a carbon source and a preparation method thereof, and the antimony / nitrogen-doped carbon composite Application of nitrogen-doped carbon composites as anode materials for sodium-ion batteries. Background technique [0002] Common chemical power sources today include lead-acid batteries, nickel metal hydride batteries, nickel-cadmium batteries, and lithium-ion batteries. These chemical power sources have played a pivotal role in today's human life and the development of the national economy. Among them, lead-acid battery materials are cheap and the technology is mature, so it is the most widely used. However, lead-acid batteries have low energy density and contain lead, a heavy metal element, which causes serious pollution to the environment. These limitations of lead-acid bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/054
CPCH01M4/364H01M4/38H01M4/583H01M10/054Y02E60/10
Inventor 周小四许欣
Owner NANJING NORMAL UNIVERSITY
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