Preparation method for core-shell type carbon-coated iron nitride nano-composite particles and application of core-shell type carbon-coated iron nitride nano-composite particles

A composite particle, iron nanotechnology, applied in nanotechnology, electrical components, battery electrodes, etc., can solve problems such as the inability to reflect the advantages of carbon material cycle performance, the lack of carbon coating structure, and the deterioration of electrode cycle performance. The effects of pulverization and failure, simple preparation process and low cost of raw materials

Inactive Publication Date: 2012-08-01
DALIAN UNIV OF TECH
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Problems solved by technology

In this method, one or more metal-organic compounds (Ti(OC 2 h 5 ) 4 and VO(OC 2 h 5 ) 3 ) was dissolved in absolute ethanol, and then added mesoporous carbon nitride for decompression treatment, after suction filtration and drying, the carbon composite titanium vanadium nitride material obtained by heat treatment under the protection of nitrogen, the material obtained by this method was irreversible for the first time The capacity is very high, the material preparation cycle is relatively long, and carbon and nit

Method used

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  • Preparation method for core-shell type carbon-coated iron nitride nano-composite particles and application of core-shell type carbon-coated iron nitride nano-composite particles
  • Preparation method for core-shell type carbon-coated iron nitride nano-composite particles and application of core-shell type carbon-coated iron nitride nano-composite particles
  • Preparation method for core-shell type carbon-coated iron nitride nano-composite particles and application of core-shell type carbon-coated iron nitride nano-composite particles

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Experimental program
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Effect test

Embodiment 1

[0027] Take about 80g of iron block and put it into the automatic control DC arc hydrogen plasma equipment to evaporate, and at the same time, feed methane and argon with a ratio of 3:4 to obtain the precursor of carbon-coated iron nanoparticles; place this precursor at 400°C Heat treatment for 4 hours under a protective atmosphere, and then cooled to room temperature to obtain carbon-coated iron nitride nanocomposites.

[0028] The above-mentioned carbon-coated iron nitride nanocomposite material is made into a lithium-ion electrode sheet, and a battery is assembled in a glove box. The electrode sheet is composed of carbon-coated iron nitride nanocomposites with a mass ratio of 80%, 10% carbon black and 10% polytetrafluoroethylene binder; the electrolyte is 1mol / L LiPF 6 solution, and the counter electrode is a lithium sheet.

[0029] The invention prepares the negative electrode of the lithium ion battery with the carbon-coated iron nitride nanocomposite material as the act...

Embodiment 2

[0033] Get about 80g of iron block and put it into the automatic control DC arc hydrogen plasma equipment to evaporate, and feed the methane and argon gas with a ratio of 1:3 at the same time to obtain the carbon-coated iron nanocomposite particle precursor; put this precursor at 400 Heat treatment for 4 hours in a protective atmosphere at about ℃, and cool to room temperature to obtain carbon-coated iron nitride nanocomposite particles.

[0034] The carbon-coated iron nitride nanocomposite material obtained in this embodiment, the electrode made therefrom and the test conditions thereof are all the same as those in Example 1.

[0035] In the second embodiment, image 3 and Figure 4 They are charge and discharge curves and cycle stability performance curves at room temperature and in the range of 2-0.01V at a current density of 100mA / g, respectively. It can be seen from the figure that when the carbon-coated iron nanocomposite material prepared by the present invention is u...

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Abstract

The invention discloses a preparation method for core-shell type carbon-coated iron nitride nano-composite particles and the application of the core-shell type carbon-coated iron nitride nano-composite particles, and belongs to the field of nano-material preparation technologies and application. The method is characterized by comprising the following steps of: automatically controlling direct current arc hydrogen plasma equipment to evaporate bulk iron raw materials, and simultaneously introducing methane and argon according to a certain proportion to obtain carbon-coated iron nano-particle precursors; and performing nitriding thermal treatment on the precursors in the ammonia atmosphere of 400 DEG C for 3 to 4 hours to obtain the carbon-coated iron nitride nano-composite particles. A lithium ion battery cathode prepared from the carbon-coated iron nitride nano-composite particles which serve as active substances has the first reversible specific capacity of 550mAh/g and high cycle stability. The method and the application have the advantages that: the carbon-coated iron nitride nano-composite particles prepared by the low-temperature nitriding of the in-situ synthesized carbon-coated iron nano-particle precursors have high lithium intercalation/de-intercalation capacity density and cycle stability; the raw materials are low in cost; a process is simple; the carbon-coated iron nitride nano-composite particles can be prepared in large scale; and industrial production requirements are met.

Description

technical field [0001] The invention belongs to the field of nanometer material preparation technology and application. It is a preparation process of core-shell carbon-coated iron nitride nanocomposite particles, and its application as a negative electrode material for lithium-ion batteries. In particular, carbon-coated iron nanoparticles synthesized in situ are used as precursors, and carbon-coated iron nitride nanocomposite particles are obtained through a low-temperature controlled nitriding process, which improves the intercalation / delithiation capacity and cycle stability. Background technique [0002] Lithium-ion batteries (also known as lithium-ion secondary batteries or lithium-ion batteries) have the advantages of high voltage, small size, light weight, high energy density, good cycle performance, and no memory effect. They are considered to be the most promising applications in the 21st century. one of the energy sources. Commercial lithium-ion battery anode mat...

Claims

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Application Information

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IPC IPC(8): H01M4/58B82Y40/00
CPCY02E60/12Y02E60/10
Inventor 董星龙黄昊吕波薛方红全燮
Owner DALIAN UNIV OF TECH
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