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Nano iron nitride-carbon composite catalyst for positive electrode of lithium-air battery and preparation method of composite catalyst

A lithium-air battery, iron nitride technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of poor conductivity and insufficient catalytic oxygen ability, and achieve high conductivity, The effect of improving electronic conductivity and high catalytic performance

Active Publication Date: 2014-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of poor electrical conductivity of this type of material limits the further improvement of its performance, and the ability to catalyze the oxygen generation reaction process is still insufficient.

Method used

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  • Nano iron nitride-carbon composite catalyst for positive electrode of lithium-air battery and preparation method of composite catalyst
  • Nano iron nitride-carbon composite catalyst for positive electrode of lithium-air battery and preparation method of composite catalyst
  • Nano iron nitride-carbon composite catalyst for positive electrode of lithium-air battery and preparation method of composite catalyst

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Experimental program
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Effect test

Embodiment 1

[0050] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:

[0051] Take 0.05mol ferric sulfate and 0.05mol trimesic acid and add them to 200ml deionized water at the same time, and add 0.02mol triethylamine as a surfactant. After magnetic stirring for 1h, ultrasonic treatment for 0.5h, a uniformly dispersed precursor solution is obtained. , placed in a condensing reflux device, heated to 50°C in an oil bath, and reacted for 12 hours at a stirring speed of 500r / min; the resulting solid product was filtered, washed alternately with deionized water and ethanol for 3 rounds, and vacuumed at 80°C Dry for 12 hours to obtain a particle size of 600nm and a specific surface area of ​​1000m 2 / g, the porosity is 0.15cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 90% mesoporous pores. SEM of nanoscale mesoporous metal organic framework complexes as attached figure 1 shown.

[0052] 2) Preparation of nano-iron nitride-carbon composite catal...

Embodiment 2

[0057] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:

[0058] Take 0.05 mol of ferric nitrate and 0.15 mol of trimesic acid into 200 ml of deionized water at the same time, and add 0.02 mol of ethylene glycol as a surfactant, after magnetic stirring for 1.5 h, ultrasonic treatment for 1 h to obtain a uniformly dispersed precursor solution , placed in a condensing reflux device, heated to 60°C in an oil bath, and reacted for 15 hours at a stirring speed of 600r / min; the resulting solid product was filtered, washed alternately with deionized water and ethanol for 5 rounds, and vacuumed at 100°C Dry for 15 hours to obtain a particle size of 250nm and a specific surface area of ​​1200m 2 / g, the porosity is 0.13cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 85% mesoporous pores.

[0059] 2) Preparation of nano-iron nitride-carbon composite catalyst:

[0060] Add the mesoporous metal-organic framework complex and dicyandiamide pr...

Embodiment 3

[0064] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:

[0065] Take 0.025 mol of iron acetate and 0.1 mol of trimesic acid and add them to 100 ml of deionized water at the same time, and add 0.03 mol of n-octanoic acid as a surfactant. After 2 hours of magnetic stirring, ultrasonic treatment for 0.5 hours, a uniformly dispersed precursor solution is obtained. Place in a condensing reflux device, heat the oil bath to 80°C, and react for 12 hours at a stirring speed of 700r / min; filter the obtained solid product, wash it alternately with deionized water and ethanol for 4 rounds, and dry it in vacuum at 90°C 12h, the obtained particle size is 220nm, and the specific surface area is 1100m 2 / g, the porosity is 0.4cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 87% mesoporous pores.

[0066] 2) Preparation of nano-iron nitride-carbon composite catalyst:

[0067] Add the mesoporous metal-organic framework complex and dicyandiamide p...

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Abstract

The invention relates to a nano iron nitride-carbon composite catalyst for a lithium-air battery and a preparation method of the composite catalyst. The method comprises the steps of feeding iron salt, organic ligand and a surface active agent into a solvent, and carrying out heating reflux; mixing the obtained nano-sized mesoporous metal organic framework complex and a nitrogenous organic compound, and carrying out heat treatment on the mixture in the presence of ammonia gas to realize carbonization and nitridation by one step. The catalyst is formed by compounding nanoscale primary iron nitride particles and carbon material; carbon covers and partly covers the surfaces of the nanoscale primary iron nitride particles; rich mesoporous gaps exist among the stacked nanoscale primary iron nitride particles. The rich mesoporous structure of a precursor is maintained by the catalyst, the catalyst has large specific surface area and high porosity, and is beneficial to diffusing oxygen molecules into the catalyst material particles, so that the contact between oxygen and the catalyst is promoted, and the utilization rate of the catalyst is increased; the electrical conductivity is effectively improved by the carbon material on the surfaces of the particles; the nano iron nitride-carbon composite catalyst is good in stability, so that the catalytic performance is well exerted. The charge and discharge polarization of the lithium-air battery is effectively reduced; furthermore, the method is simple and convenient, the operation is easy, the cost is low, and large-scale production can be easily implemented.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a nano-iron nitride-carbon composite catalyst for a positive electrode of a lithium-air battery and a preparation method thereof. Background technique [0002] With the rapid development of the global economy, the human demand for energy is getting higher and higher, while the non-renewability of traditional fossil fuel energy and the pollution caused by fossil fuel combustion are becoming more and more prominent. The development of new energy technologies has gradually become a human priority. Focus on focus and research hotspots. In recent decades, with the commercial success of lithium-ion batteries, research on lithium-based high-performance chemical power sources has intensified. [0003] Due to its very high energy density, lithium-air batteries have become the most potential future generation of energy storage power sources. Lithium-air batteries are a battery system in which met...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCB82Y30/00H01M4/8605H01M4/8673H01M4/90H01M12/08H01M2004/8689
Inventor 张治安陈巍汪建军包维斋甘永青赖延清李劼
Owner CENT SOUTH UNIV
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