Porous ferrous sulfide nanowires and nitrogen doped carbon composite material and preparation method and application thereof

A ferrous sulfide, nitrogen-doped carbon technology, applied in the field of nanomaterials and electrochemistry, can solve the problems of structural instability, high rate and long life limitation, and achieve low equipment requirements, high energy density, and shortened diffusion distance Effect

Active Publication Date: 2018-01-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key problem restricting its wide application is: the limitation of high rate and long life caused by structural instability

Method used

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  • Porous ferrous sulfide nanowires and nitrogen doped carbon composite material and preparation method and application thereof
  • Porous ferrous sulfide nanowires and nitrogen doped carbon composite material and preparation method and application thereof
  • Porous ferrous sulfide nanowires and nitrogen doped carbon composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation method of porous ferrous sulfide nanowire and nitrogen-doped carbon composite material, it comprises the steps:

[0032] 1) Dissolve 1 mmol of ferrous sulfate heptahydrate in 25 ml of deionized water, and stir magnetically at room temperature until completely dissolved;

[0033] 2) Add 2 mmol of thioacetamide to the solution obtained in step 1), and stir magnetically at room temperature until completely dissolved;

[0034] 3) Add 5ml of ethylene glycol to the solution obtained in step 2), and stir at room temperature for 5 minutes;

[0035] 4) Add 5ml of ethylenediamine to the solution obtained in step 3), and stir at room temperature for 40 minutes;

[0036] 5) Transfer the solution obtained in step 4) into a 50mL reaction kettle, conduct a hydrothermal reaction at 180°C for 24 hours, take out the reaction kettle, and naturally cool to room temperature;

[0037] 6) The product obtained in step 5) is centrifuged, washed three times with deionized water...

Embodiment 2

[0042] 1) Dissolve 1 mmol of ferrous sulfate heptahydrate in 25 ml of deionized water, and stir magnetically at room temperature until completely dissolved;

[0043] 2) Add 2 mmol of thioacetamide to the solution obtained in step 1), and stir magnetically at room temperature until completely dissolved;

[0044] 3) Add 5ml of ethylene glycol to the solution obtained in step 2), and stir at room temperature for 2 minutes;

[0045] 4) Add 5ml of ethylenediamine to the solution obtained in step 3), and stir at room temperature for 50 minutes;

[0046] 5) Transfer the solution obtained in step 4) into a 50mL reaction kettle, conduct a hydrothermal reaction at 160°C for 24 hours, take out the reaction kettle, and naturally cool to room temperature;

[0047] 6) The product obtained in step 5) is centrifuged, washed three times with deionized water and absolute ethanol, and dried in an oven at 60-80°C to obtain the ferrous sulfide nanowire material precursor;

[0048] 7) The precurs...

Embodiment 3

[0051] 1) Dissolve 1 mmol of ferrous sulfate heptahydrate in 25 ml of deionized water, and stir magnetically at room temperature until completely dissolved;

[0052] 2) Add 2 mmol of thioacetamide to the solution obtained in step 1), and stir magnetically at room temperature until completely dissolved;

[0053] 3) Add 5ml of ethylene glycol to the solution obtained in step 2), and stir at room temperature for 5 minutes;

[0054] 4) Add 5ml of ethylenediamine to the solution obtained in step 3), and stir at room temperature for 45 minutes;

[0055] 5) Transfer the solution obtained in step 4) into a 50mL reaction kettle, and conduct a hydrothermal reaction at 200°C for 16 hours, take out the reaction kettle, and cool it down to room temperature naturally;

[0056] 6) The product obtained in step 5) is centrifuged, washed three times with deionized water and absolute ethanol, and dried in an oven at 60-80°C to obtain the ferrous sulfide nanowire material precursor;

[0057] 7)...

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Abstract

The invention relates to porous ferrous sulfide nanowires and nitrogen doped carbon composite material and a preparation method thereof; the material can be used as a long-life and high-rate lithium ion battery negative electrode active material, is nanowires formed by compositing an in-situ generated ferrous sulfide nano-crystalline grains and nitrogen doped carbon, has a porous structure, and has the length of 1-10 [mu]m, the width of 100-500 nm and the thickness of 8-15 nm. The composite material has the beneficial effects that the simple hydrothermal and calcining method is only adopted, and the prepared material has high yield and good dispersibility, and makes great efforts to explore large-scale synthesis of nano materials with excellent performance and high rate; the method is simple in process, meets the requirements of green chemistry, has low requirements for equipment and has great potential for application; and the method shortens the diffusion distance of lithium ions andelectrons, buffers the volume change during the cycle process, thereby effectively improving the electrochemical performance of the material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a porous ferrous sulfide nanowire and nitrogen-doped carbon composite material and a preparation method thereof. The material can be used as a long-life, high-rate lithium-ion battery negative electrode active material. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic devices due to their advantages such as high energy density, small memory effect, and low self-discharge rate. However, in order to meet the current large-scale energy storage and transportation needs, the service life of lithium-ion batteries still needs to be further improved. Electrode materials are an important part of lithium-ion batteries and play a decisive role in battery performance. The current commercial anode material is mainly graphite, but its theoretical capacity (372mAh g -1 ) and volume-specific capacity are not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 麦立强韦秀娟谈鑫安琴友
Owner WUHAN UNIV OF TECH
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