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Preparation method of Fe3O4/nitrogen-doped graphene material capable of being used for lithium ion battery negative electrode

A nitrogen-doped graphene, lithium-ion battery technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve problems such as poor particle size uniformity, poor controllability, and shedding. Achieve the effects of strong controllability, excellent lithium battery performance, and rich raw materials

Active Publication Date: 2018-04-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, graphene-based iron-based oxide composites are prepared by mixing graphene and iron-based precursors, followed by hydrothermal treatment and high-temperature treatment, but this method has poor controllability, and the formed particles generally have poor size uniformity. Moreover, the interaction between the particles and the graphene carrier is not strong, and it is easy to fall off during charging and discharging, so the improvement of lithium battery performance is limited.

Method used

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  • Preparation method of Fe3O4/nitrogen-doped graphene material capable of being used for lithium ion battery negative electrode
  • Preparation method of Fe3O4/nitrogen-doped graphene material capable of being used for lithium ion battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Disperse 50mg of graphene oxide in 50ml of deionized water, add 50mg of dopamine hydrochloride, stir for 30min, add a certain amount of Tris to adjust the pH of the solution to 8.5, and then react at room temperature for 24 hours. After the reaction, the product is pumped with deionized water Filter until neutral and dry at 80°C for 12h. The obtained polydopamine / graphene composite was redispersed into 50 mL of deionized water. Then add 400 mg of ferric nitrate to the solution, stir for 30 min, then use a syringe pump to add 1 mol / L NaOH solution at a rate of 250 μL / min to adjust the pH to 9, react at room temperature for 24 h, wash with deionized water to neutral, and 80 °C Dry for 12 hours.

[0018] The obtained material was ground and put into a tube furnace, and the temperature was raised to 500 °C at a rate of 2 °C / min under nitrogen atmosphere, and then kept for 2 h to obtain Fe 3 o 4 / Nitrogen-doped graphene composites. The obtained nanoparticles are evenly d...

Embodiment 2

[0020] Take 100 mg of graphene oxide and disperse it in 50 ml of deionized water, add 100 mg of dopamine hydrochloride, stir for 30 minutes, add a certain amount of Tris to adjust the pH of the solution to 8.5, and then react at room temperature for 12 hours. After the reaction, the product is pumped with deionized water Filter to neutral and dry at 80°C for 12h. The polydopamine / graphene composite was redispersed into 50 mL of deionized water, and then 1000 mg of ferric nitrate was added to the solution. After stirring for 30 min, 1 mol / L NaOH solution was added at a rate of 500 μL / min using a syringe pump to adjust the pH to 9 , reacted at 50°C for 12h, washed with deionized water to become neutral, and dried at 80°C for 12h.

[0021] The obtained material was ground and placed in a tube furnace, and the temperature was raised to 500 °C at a rate of 2 °C / min under an argon atmosphere, and then kept for 2 h to obtain Fe 3 o 4 / Nitrogen-doped graphene composites.

Embodiment 3

[0023] Take 100 mg of graphene oxide and disperse it in 50 ml of deionized water, add 100 mg of dopamine hydrochloride, stir for 30 minutes, add a certain amount of Tris to adjust the pH of the solution to 8.5, and then react at room temperature for 24 hours. After the reaction, the product is pumped with deionized water Filter to neutral and dry at 80°C for 12h. The polydopamine / graphene complex was redispersed into 50 mL of deionized water, and then 200 mg of ferric chloride was added to the solution. After stirring for 30 min, a 1 mol / L NaOH solution was added at a rate of 1000 μL / min using a syringe pump to adjust the pH~ 9. React at 40°C for 12 hours, wash with deionized water to make it neutral, and dry at 80°C for 12 hours.

[0024] The obtained material was ground and placed in a tube furnace, and the temperature was raised to 400 °C at a rate of 5 °C / min under an argon atmosphere, and then kept for 1 h to obtain Fe 3 o 4 / Nitrogen-doped graphene composites. The obt...

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Abstract

The invention belongs to the technical field of material preparation, and relates to a preparation method of a Fe3O4 / nitrogen-doped graphene material capable of being used for a lithium ion battery negative electrode. Graphene oxide is combined through in-situ polymerization of dopamine hydrochloride in an alkali condition by taking two-dimensional graphene oxide as a raw material to obtain a graphene compound substrate rich with an electronegative group, a graphene-based compound is dispersed in deionized water, an iron salt precursor is added, an alkali liquid is dropwise added to regulate pH, and the uniform loading of Fe3O4 nanoparticles on a surface of nitrogen-doped graphene is achieved by controlling the adding rate of the alkali liquid and a subsequent high-temperature processing condition. The raw material used by the method is rich, and the preparation method is high in controllability; the growth of the Fe3O4 nanoparticles is controlled very well by the preparation method; the obtained Fe3O4 nanoparticles are uniformly dispersed on the surface of the graphene; and relatively excellent lithium battery performance is achieved by taking the prepared Fe3O4 / nitrogen-doped graphene material as a lithium battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a Fe that can be used for the negative electrode of a lithium ion battery 3 o 4 / Nitrogen-doped graphene material and preparation method thereof. Background technique [0002] As an important part of lithium-ion batteries, negative electrode materials directly affect the energy density, cycle life and safety performance of batteries. At present, carbon-based materials are relatively mature in the application of lithium-ion battery anodes, but carbon-based materials cannot meet the requirements of high-performance lithium-ion batteries due to their low theoretical capacity and poor rate performance. Therefore, Fe with a high theoretical specific capacity 3 o 4 Inorganic materials such as Fe have been widely concerned by researchers, but Fe 3 o 4 The conductivity of the material is poor, and the volume effect is obvious during charging and discharging, which can e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/523H01M4/625H01M10/0525Y02E60/10
Inventor 张旭范秋雨杨贺米盼盼马思瑜
Owner DALIAN UNIV OF TECH
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