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Co-doped FeNCN/C as well as preparation method and application thereof

An iron salt and organic acid technology, applied in the field of electrochemistry, can solve the problems of harsh preparation environment and complex synthesis process, and achieve the effects of simplifying the preparation process, good energy storage performance, and fast charging and discharging.

Active Publication Date: 2020-05-08
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of Co-doped FeNCN / C and its preparation method and application, to overcome the complex synthesis process existing in the prior art, the problem of harsh preparation environment

Method used

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  • Co-doped FeNCN/C as well as preparation method and application thereof
  • Co-doped FeNCN/C as well as preparation method and application thereof
  • Co-doped FeNCN/C as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A preparation method of Co-doped FeNCN / C includes the following steps:

[0028] 1) Add 1.0 g analytically pure urea, 1.0 g ferric ammonium oxalate, and 0.1 g cobalt acetate tetrahydrate into 10 mL of deionized water, stir for 1 h to form a complex of iron salt and cobalt salt, labeled A;

[0029] 2) Freeze solution A at -30°C for 2 h, and then dry it in a vacuum freeze dryer for 24 h to obtain flake precursor B.

[0030] 3) Put product B in a tube furnace, the protective atmosphere is argon, the flow rate of argon is 100 sccm, and after the temperature is raised to 300 °C at a rapid rate of 10 °C / min, the flow rate of argon is adjusted to 200 sccm, Incubate for 1 hour, then heat up to 500 °C at a slow rate of 5 °C / min, and keep it for 1 h. After the incubation is over, continue to ventilate with argon until it cools down to room temperature. The flow rate of argon is 300 sccm to obtain the final The product Co is doped with FeNCN / C.

Embodiment 2

[0032] A preparation method of Co-doped FeNCN / C includes the following steps:

[0033] 1) Add 2.0 g of analytically pure cyanamide, 1.0 g of ferric amine citrate, and 0.2 g of cobalt acetate tetrahydrate into 20 mL of deionized water and stir for 2 h to form an iron salt complex, labeled as solution A;

[0034] 2) Freeze solution A at -30°C for 2 h, and then dry it in a vacuum freeze dryer for 24 h to obtain flake precursor B.

[0035] 3) Put product B in a tube furnace, the protective atmosphere is argon, and the flow rate of argon is 100 sccm. After heating to 300 °C at a rapid rate of 12°C / min, adjust the flow rate of argon to 200 sccm. Incubate for 1 hour, then increase the temperature to 450 °C at a slow rate of 3°C / min, and keep it for 2 hours to obtain the final product Co-doped FeNCN / C.

[0036] The above Example 1 is the best example, and the product obtained in Example 1 is analyzed:

[0037] Through XRD characterization and analysis, the XRD pattern and FTIR pattern of the C...

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Abstract

The invention provides a Co-doped FeNCN / C compound prepared through a one-step in-situ synthesis method, the tedious preparation process of the FeNCN material is simplified, and equipment is simple; and meanwhile, the Co-doped FeNCN / C compound is prepared from cheap carbon and nitrogen sources (urea or cyanamide), organic ferric salt and cobalt salt, so that the raw materials are low in price, themethod is simple, the reaction temperature is relatively mild, and the energy consumption is relatively low. FeNCN is a metastable compound and is easily reduced by ammonia gas generated by decomposing urea at high temperature, so the flow rate control of argon is a very critical technology in the whole synthesis process. The decomposition temperature of the urea is 200 to 300 DEG C; in order toensure the smooth discharge of redundant unreacted ammonia gas, the flow rate of the carrier gas argon is 100 sccm at the moment; and, in order to discharge residual ammonia gas as soon as possible toavoid a reduction reaction at a high temperature, the flow rate of carrier gas argon is increased to 200-300 sccm, the method is simple and easy to control, industrial batch production is easy to realize, and no by-product is generated in the reaction.

Description

Technical field [0001] The invention belongs to the field of electrochemical technology, and specifically relates to a Co-doped FeNCN / C and its preparation method and application. [0002] technical background [0003] 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 successfully achieved commercialization. However, the reserves of lithium resources on the earth are relatively low and the price is expensive, which has become an obstacle to the continued development of lithium-ion batteries. Therefore, it is urgent to find an element with abundant reserves and similar properties to replace the lithium element. Sodium and lithium are elements of the same main group, and sodium has a relatively high reserve and widely distributed on the earth. Therefore, in recent years, a large number of scientific researchers have invested a lot of energy in the research of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/525H01M4/625H01M4/583H01M10/0525Y02E60/10
Inventor 齐慧唐霖邓雯
Owner XIAN TECH UNIV
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