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Graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, and preparation and application thereof

A graphite phase carbon nitride and coating technology, which is applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of low initial Coulombic efficiency, volume expansion during charging and discharging, and difficulty in meeting future needs. Achieve the effects of thin and uniform coating layer, enhanced electrical conductivity, and stable cycle performance

Active Publication Date: 2019-11-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional graphite is used as the negative electrode of lithium batteries, and its research and development is close to its theoretical specific capacity of 372mAh / g, which is difficult to meet future needs
Among them, the transition metal oxide ferric oxide (Fe 2 o 3 ) The theoretical capacity (1007mAh / g) is three times that of graphite, which has great application prospects; but it has the disadvantages of low initial Coulombic efficiency and volume expansion during charging and discharging

Method used

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  • Graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, and preparation and application thereof
  • Graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, and preparation and application thereof

Examples

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Embodiment 1

[0031] A Kind of Graphite Phase Carbon Nitride Coated α-Fe 2 o 3 The preparation method of the material comprises the following steps: adding 0.01 mol of ferric nitrate to 200 ml of deionized water to dissolve, then adding 0.05 mol of urea, stirring for 1 hour by magnetic force, and dispersing by ultrasonic wave for 0.5 hours to obtain a precursor solution; taking the precursor solution in a tube furnace In an air atmosphere, heat up to 200°C at a rate of 3°C / min, sinter for 2 hours, then heat up to 400°C at a rate of 3°C / min, and sinter for 2 hours, then take it out and wash it alternately with deionized water for 3 times to medium properties, vacuum drying at 80°C for 24 hours to obtain graphite-like carbon nitride-coated α-Fe 2 o 3 Material.

Embodiment 2

[0033] A Kind of Graphite Phase Carbon Nitride Coated α-Fe 2 o 3 The preparation method of the material comprises the following steps: adding 0.01 mol of ferric nitrate to 200 ml of deionized water to dissolve, then adding 0.05 mol of urea, stirring for 1 hour by magnetic force, and dispersing by ultrasonic wave for 0.5 hours to obtain a precursor solution; taking the precursor solution in a tube furnace In an air atmosphere, heat up to 300°C at a rate of 3°C / min, sinter for 2 hours, then heat up to 600°C at a rate of 3°C / min, sinter for 2 hours, then take out and wash with deionized water alternately 3 times to medium properties, vacuum drying at 80°C for 24 hours to obtain graphite-like carbon nitride-coated α-Fe 2 o 3 Material.

Embodiment 3

[0035] A Kind of Graphite Phase Carbon Nitride Coated α-Fe 2 o 3 The preparation method of the material comprises the following steps: adding 0.01 mol of ferric nitrate to 200 ml of deionized water to dissolve, then adding 0.1 mol of urea, stirring for 1 hour by magnetic force, and dispersing by ultrasonic wave for 0.5 hours to obtain a precursor solution; taking the precursor solution in a tube furnace In an air atmosphere, heat up to 200°C at a rate of 3°C / min, sinter for 2 hours, then heat up to 600°C at a rate of 3°C / min, and sinter for 2 hours, then take it out and wash it alternately with deionized water for 3 times to medium properties, vacuum drying at 80°C for 24 hours to obtain graphite-like carbon nitride-coated α-Fe 2 o 3 Material.

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Abstract

The invention discloses a method for preparing a graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, comprising the steps of: uniformly stirring and mixing an iron salt and a graphite-like phase carbon nitride precursor in water, dispersing ultrasonically the mixture to obtain a precursor solution; sintering the precursor solution, washing the sintered precursor solution with waterto neutrality, and drying the product to obtain a graphite-like phase carbon nitride-coated [alpha]-Fe2O3 material. The invention also discloses a graphite-like phase carbon nitride coated [alpha]-Fe2O3 material, which is prepared by using the preparation method. The invention also discloses the application of the graphite-like phase carbon nitride coated [alpha]-Fe2O3 material in preparing battery electrodes, supercapacitors and electric vehicles. The method realizes the uniform coating of graphite phase carbon nitride. The graphite phase carbon nitride on the surface of [alpha]-Fe2O3 effectively improves the conductivity and the stability of [alpha]-Fe2O3. The graphite phase carbon nitride and the [alpha]-Fe2O3 have a synergistic effect.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a graphite phase carbon nitride coated α-Fe 2 o 3 Materials and their preparation methods and applications. 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] With the development of new energy electric vehicles and the promotion of national policies, the market demand for high energy density lithium-ion batteries is also increasing. Traditional graphi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCH01M4/362H01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 辛昱林少雄辛利君王辉
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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