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A kind of co-doped fencn/c and its preparation method and application

A technology of iron salt and organic acid, which is applied in the field of electrochemistry, can solve the problems of harsh preparation environment and complex synthesis process, and achieve the effects of simplified preparation process, good energy storage performance, and rapid charge and discharge

Active Publication Date: 2022-06-24
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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  • A kind of co-doped fencn/c and its preparation method and application
  • A kind of co-doped fencn/c and its preparation method and application
  • A kind of co-doped fencn/c and its preparation method and application

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Embodiment 1

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

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

[0029] 2) Solution A was frozen at -30 °C for 2 h, and then dried in a vacuum freeze dryer for 24 h to obtain sheet precursor B.

[0030] 3) Put the product B in a tube furnace, the protective atmosphere is argon, and the argon flow rate is 100 sccm. After the temperature is raised to 300 °C at a rapid rate of 10 °C / min, the argon flow rate is adjusted to 200 sccm, and the heat preservation After 1 hour, the temperature was raised to 500 °C at a slow rate of 5 °C / min, and kept for 1 h. After the heat preservation was completed, the argon gas was continued to cool down to room temperature naturally, and the argon flow rate was 300 sccm to obtain the final product C...

Embodiment 2

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

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

[0034] 2) Solution A was frozen at -30 °C for 2 h, and then dried in a vacuum freeze dryer for 24 h to obtain sheet precursor B.

[0035] 3) Put the product B in a tube furnace, the protective atmosphere is argon, and the argon flow rate is 100 sccm. After heating up to 300 ℃ at a rapid rate of 12°C / min, adjust the argon flow rate to 200 sccm, and keep warm for 1 After that, the temperature was raised to 450 °C at a slow rate of 3 °C / min and kept for 2 h to obtain the final product Co-doped FeNCN / C.

[0036] Above embodiment 1 is best embodiment, the product that embodiment 1 is made is analyzed:

[0037] By XRD characterization analysis, the XRD pattern and the FTI...

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Abstract

The present invention proposes a one-step in-situ synthesis method to prepare Co-doped FeNCN / C composites, which simplifies the tedious preparation process of FeNCN materials, and the equipment is simple; at the same time, the present invention uses cheap carbon and nitrogen sources (urea or cyanamide), organic iron Salt and cobalt salt to prepare Co-doped FeNCN / C composite, the raw material is cheap, the method is simple, the reaction temperature is relatively mild, and the energy consumption is low; since FeNCN is a metastable compound, it is easily decomposed by urea at high temperature The generated ammonia is reduced, so the flow rate control of argon is a very critical technology in the whole synthesis process. The decomposition temperature of urea is at 200 to 300°C. In order to ensure the smooth discharge of excess unreacted ammonia gas, the flow rate of the carrier gas argon in the present invention is 100 sccm. When the temperature rises to more than 300°C, in order to The residual ammonia gas is discharged to avoid the reduction reaction at high temperature, and the flow rate of the carrier gas argon is increased to 200-300 sccm. The method is simple and easy to control, and it is easy to realize industrial batch production, and the reaction has no by-products.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular 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 been successfully commercialized. However, the relatively low reserves of lithium resources on the earth and the high price have 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 lithium. Sodium and lithium are elements of the same main group, and sodium reserves are high 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 sodium-ion batteries, and sodium-ion batte...

Claims

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Application Information

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Patent Type & Authority Patents(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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