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A preparation method of a high-performance lithium ion battery negative electrode material, namely a core-shell structure FeS2 <at> C nanoring

A lithium-ion battery, core-shell structure technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of poor cycle and rate performance, not yet obtained nano-transition metal sulfide, conductivity Low-level problems, to achieve the effect of good rate performance, regular material structure, and simple formula

Active Publication Date: 2018-12-11
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

There are many during the period: the synthesis of FeS by electrochemical deposition 2 , FeS synthesized by hydrothermal method 2 , solvothermal synthesis of FeS 2 , Synthesis of FeS by mechanical ball milling 2 etc. However, due to the disadvantages of low electrical conductivity, volume expansion during charge and discharge cycles, and the dissolution of active materials in the electrolyte, the cyclability and rate performance are relatively poor.
At present, there are two types of methods to solve this kind of problem: one involves nanostructured materials, which use nanoeffects to increase the diffusion rate of lithium ions and electron transmission. So far, no nanomaterials with high specific capacity and high rate performance in the true sense have Transition metal sulfide; the second is to prepare carbon / metal sulfide composite materials, and improve the electrochemical performance of the material by taking advantage of the excellent ion and electronic conductivity of carbon materials

Method used

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  • A preparation method of a high-performance lithium ion battery negative electrode material, namely a core-shell structure FeS2 &lt;at&gt; C nanoring
  • A preparation method of a high-performance lithium ion battery negative electrode material, namely a core-shell structure FeS2 &lt;at&gt; C nanoring
  • A preparation method of a high-performance lithium ion battery negative electrode material, namely a core-shell structure FeS2 &lt;at&gt; C nanoring

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 5.4057gFeCl 3 ·6H 2 O, 0.0250gNaH 2 PO 4 2H 2 O and 0.0781gNa 2 SO 4 Dissolve in 1000ml of deionized water and stir for 1h at 100r / min. The solution was transferred into a Teflon-lined stainless steel autoclave and hydrothermally treated at 220 °C for 48 h. After the autoclave was cooled to room temperature, the sample was collected by centrifugation at a speed of 8000 r / min with a high-speed centrifuge, washed several times with deionized water and absolute ethanol, and finally dried in a constant temperature oven for 8 hours. The resulting red powder is Fe 2 o 3 nano ring. Then will contain 0.15g Fe 2 o 3 Granules, 0.5g cetyltrimethylammonium bromide and 15ml H 2 The aqueous dispersion of O was transferred to a round bottom flask. After stirring for 2 hours under 0.5h ultrasound and 100r / min speed, add 0.7g resorcinol, 56ml absolute ethanol and 0.2~0.4ml NH 4 Oh. Stir the flask at 35°C for 0.5 hours, and finally add 0.1~0.2ml of formalin solution (F). ...

Embodiment 2

[0036] 5.6gFeCl 3 ·6H 2 O, 0.020gNaH 2 PO 4 2H 2 O and 0.077gNa 2 SO 4 Dissolve in 1000ml of deionized water and stir for 1h at 100r / min. The solution was transferred into a Teflon-lined stainless steel autoclave and hydrothermally treated at 220 °C for 48 h. After the autoclave was cooled to room temperature, the sample was collected by centrifugation at a speed of 8000 r / min with a high-speed centrifuge, washed several times with deionized water and absolute ethanol, and finally dried in a constant temperature oven for 8 hours. The resulting red powder is Fe 2 o 3 nano ring.

[0037] Then will contain 0.2gFe 2 o 3 Granules, 2.64g cetyltrimethylammonium bromide and 40ml H 2 The aqueous dispersion of O was transferred to a round bottom flask. After stirring for 2 hours under 0.5h ultrasound and 100r / min speed, add 1.4g resorcinol, 200ml absolute ethanol and 0.8ml NH 4 Oh. Stir the flask at 35°C for 0.5 hours, and finally add 0.4~0.8ml of formalin solution (F). ...

Embodiment 3

[0040] 5.4~5.6gFeCl 3 ·6H 2 O, 0.023~0.026gNaH 2 PO 4 2H 2 O and 0.076~0.079gNa 2 SO 4 Dissolve in 1000ml of deionized water and stir for 1h at 100r / min. The solution was transferred into a Teflon-lined stainless steel autoclave and hydrothermally treated at 220 °C for 48 h. After the autoclave was cooled to room temperature, the sample was collected by centrifugation at a speed of 8000 r / min with a high-speed centrifuge, washed several times with deionized water and absolute ethanol, and finally dried in a constant temperature oven for 8 hours. The resulting red powder is Fe 2 o 3 nano ring. Then will contain 0.2g Fe 2 o 3 Granules, 0.2g cetyltrimethylammonium bromide and 20ml H 2 The aqueous dispersion of O was transferred to a round bottom flask. After stirring for 2 hours under 0.5h ultrasound and 100r / min speed, add 0.3g resorcinol, 55ml absolute ethanol and 0.15ml NH 4 Oh. The flask was stirred at 35 °C for 0.5 h and finally 0.15 ml of formalin solution (F...

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Abstract

The invention relates to the technical field of nano negative electrode materials, in particular to a preparation method of a high-performance lithium ion battery negative electrode material, namely acore-shell structure FeS2 <at> C nano ring. The method comprises the following steps of: 1) preparing alpha-Fe2O3 nanoring particles; 2) that prepare alpha-Fe 2O 3 is coat with organic layer to prepare alpha-Fe2O3 <at> RF nanoring particles; 3) the prepared alpha-Fe2O3 <at> RF nanoring particles are heat treated even if the organic matter is carbonized to obtain Fe3O4 <at> C nanorings; 4) sulfiding the obtained Fe3O4 <at> C to obtain FeS2 <at> C nanoring particles; 5) The obtained FeS2 <at> C nano-ring particles are made into button cells for electrochemical testing. The invention has simpleformula, simple operation, good repeatability, high product purity, abundant raw materials, environment-friendly type, regular material structure, good stability, and high capacity as negative electrode material.

Description

technical field [0001] The invention relates to the technical field of preparation of nano negative electrode materials, in particular to a preparation method of a high-performance lithium ion battery negative electrode material, that is, a core-shell structure FeS2@C nano ring. Background technique [0002] FeS 2 And its high energy density (1C=894mAh g -1 ), safe and non-toxic, stable in structure and low in price, it is deeply valued by researchers. With the continuous development of science and technology, FeS 2 The preparation methods of FeS are also constantly being innovated, and various methods are constantly crossing, infiltrating, learning from each other, and preparing many FeS with excellent performance. 2 particles. There are many during the period: the synthesis of FeS by electrochemical deposition 2 , FeS synthesized by hydrothermal method 2 , solvothermal synthesis of FeS 2 , Synthesis of FeS by mechanical ball milling 2 However, due to the disad...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5815H01M4/625H01M10/0525Y02E60/10
Inventor 姚卫棠张群斌戴金延刘小楠廖江廖敏
Owner SOUTHWEAT UNIV OF SCI & TECH
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