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Carbon-coated ferroferric oxide/nitrogen-doped grapheme composite material and preparation method thereof

A carbon-coated ferric oxide and nitrogen-doped graphene technology is applied in the field of materials and electrochemistry, which can solve the problems of low electrical conductivity, large volume change, and limited application of ferric oxide materials, so as to improve the electrochemical performance. performance, high rate capability, and the effect of a simple preparation method

Active Publication Date: 2016-07-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrical conductivity of ferroferric oxide is low, and there is a large volume change during the lithium ion intercalation process, which leads to the failure of the material and greatly limits its application.

Method used

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  • Carbon-coated ferroferric oxide/nitrogen-doped grapheme composite material and preparation method thereof
  • Carbon-coated ferroferric oxide/nitrogen-doped grapheme composite material and preparation method thereof
  • Carbon-coated ferroferric oxide/nitrogen-doped grapheme composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Graphene oxide was prepared by the traditional Hummers method. Assemble a 250ml reaction bottle in an ice-water bath, add 23ml of concentrated sulfuric acid, add 2g of natural flake graphite powder and 1g of sodium nitrate under stirring, control the temperature below 4°C for 2 hours during the whole process, and then gradually add 6g of potassium permanganate to control the reaction The temperature does not exceed 20°C, stir and react for 1h, then raise the temperature to about 35°C and continue to stir for 30min, then slowly add 60ml of deionized water, stir for 20min, and add 25ml of hydrogen peroxide (30Vol%) to react for 15min to turn the solution into bright yellow, and use 40ml HCl solution (10Vol%) was dissolved, centrifuged and washed with deionized water until the pH value was close to neutral, and finally the obtained graphene oxide aqueous solution was freeze-dried (vacuum, -50° C.) to obtain graphene oxide.

[0035] Step 1. Dissolve 300 mg of graphene oxide...

Embodiment 2

[0041] Step 1. Dissolve 300 mg of graphene oxide in 30 mL of distilled water, stir and sonicate for 20 minutes to obtain a uniform suspension;

[0042] Step 2. Add 1 g (5 mmol) of ferrous chloride tetrahydrate to the suspension obtained in step 1, and stir for 10 min;

[0043] Step 3: Add 1.0 g of melamine to the mixture obtained in Step 2, stir for 30 min, then add 2 ml of formaldehyde solution, transfer the mixed solution to a 100 ml polytetrafluoroethylene liner, and react in a hydrothermal kettle at 190° C. for 5 h.

[0044] Step 4, filter the reaction product obtained in step 3, transfer the filtered solid product to 200mL30wt% ammonia water, let it stand for 1h, and obtain the ferric oxide / melamine resin / graphene composite material, and freeze-dry the material deal with.

[0045] Step 5. Sinter the freeze-dried Fe3O4 / melamine resin / graphene composite material in a tube furnace at 700 °C under nitrogen protection for 3 hours to obtain carbon-coated Fe3O4 / nitrogen-doped g...

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Abstract

The invention relates to a composite material and a preparation method thereof, in particular to a carbon-coated ferroferric oxide / nitrogen-doped grapheme composite material and a preparation method thereof, and belongs to the technical fields of material and electrochemistry. The composite material comprises carbon-coated ferroferric oxide and nitrogen-doped grapheme, and in the composite material, ferroferric oxide is uniformly distributed on the surface of a grapheme sheet layer. The composite material comprises carbon-coated ferroferric oxide and nitrogen-doped grapheme, and has excellent cycling performance and rate capability during use as a lithium ion battery cathode material. In addition, the composite material can effectively buffer the volume effect of ferroferric oxide in electrochemical reaction, meanwhile further improves the electrical conductivity, and greatly reduces the impedance of a battery, thereby effectively improving the electrochemical performance.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to a carbon-coated ferric oxide / nitrogen-doped graphite composite material and a preparation method thereof, belonging to the technical field of materials and electrochemistry, and the invention also relates to the composite material Application in lithium-ion battery anode materials. Background technique [0002] With the depletion of petroleum resources, promoting the development of renewable energy has significant social and economic benefits. Among the new energy storage technologies based on chemical energy storage, lithium ions have the advantages of high open circuit voltage, long cycle life, high energy density, no memory effect, and environmental friendliness. Compared with other secondary batteries (Ni-MH batteries, Lead-acid batteries, nickel-cadmium batteries) incomparable advantages such as superior electrical performance and variable appearance ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/48H01M10/0525H01M4/139
CPCH01M4/139H01M4/362H01M4/483H01M4/583H01M10/0525Y02E60/10
Inventor 杨伟梁成露刘洋包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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