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Tremella-like MoS2/functionalized activated carbon sodium-ion battery negative electrode material and preparation method thereof

A technology of sodium ion battery and negative electrode material, applied in the direction of active material electrode, battery electrode, negative electrode, etc., can solve the problems of poor electronic conductivity of electrode material, loss of active sites, poor conductivity, etc., to achieve low cost and improve stability , the effect of high yield

Inactive Publication Date: 2021-12-03
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MoS 2 The volume of the electrode changes during the conversion reaction, the pulverization phenomenon is serious, and the active sites are greatly lost, and the MoS 2 Poor electrical conductivity, making the electrode material poor electronic conductivity

Method used

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  • Tremella-like MoS2/functionalized activated carbon sodium-ion battery negative electrode material and preparation method thereof
  • Tremella-like MoS2/functionalized activated carbon sodium-ion battery negative electrode material and preparation method thereof
  • Tremella-like MoS2/functionalized activated carbon sodium-ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0024] The invention provides a tremella-like MoS 2 The preparation method of functionalized activated carbon sodium ion battery negative electrode material specifically comprises the following steps:

[0025] Step 1: Mix 0.1~1.0g AC and 0.5~2.0g NaNO 3 Disperse in 10-100mL concentrated sulfuric acid, then magnetically stir at 30-100°C for 1-5h to obtain a dispersion; add 0.5-4.0g KMnO 4 After grinding, gradually add to the dispersion liquid, then dilute the above mixture with 50~200mL deionized water, and let it stand for 12~36h; then centrifuge the diluted mixture, wash it several times with deionized water and absolute ethanol, and freeze-dry 8-24 hours to obtain HFAC;

[0026] Step 2: Disperse 0.01-0.50g HFAC in 10-50mL of ethanol and ultrasonically for 10-60 minutes, record it as dispersion A; 2 MoO 4 and 0.1~1.5g C 2 h 5 Dissolve all NS in 5-20mL deionized water until a clear solution B is formed;

[0027] Step 3: Add solution A to dispersion B, stir magnetically ...

Embodiment 1

[0031] Include the following steps:

[0032] (1) Mix 1.0g AC and 2.0g NaNO 3 Disperse in 100mL of concentrated sulfuric acid, then magnetically stir at 100°C for 5h to obtain a dispersion, and 2.0g of KMnO 4 After grinding, gradually add to the dispersion liquid, then dilute the above mixture with 200 mL deionized water, and let it stand for 36 h; centrifuge the diluted mixture, wash with deionized water and ethanol several times, and obtain HFAC by freeze-drying for 24 h;

[0033] (2) Disperse 0.50g HFAC in 50mL ethanol and sonicate for 60 minutes, which is recorded as solution A; by continuous stirring, 1.0g Na 2 MoO 4 and 1.5g C 2 h 5 NS was completely dissolved in 20mL deionized water until a clear solution B was formed;

[0034] (3) Add solution A to solution B, stir it magnetically for 10 hours, then transfer the resulting liquid to a high-pressure reactor, heat it to 200 degrees Celsius at a heating rate of 10 degrees Celsius / min, keep it warm for 20 hours, and aft...

Embodiment 2

[0036] Include the following steps:

[0037] (1) Mix 0.4g AC and 1.0g NaNO 3 Disperse in 50mL of concentrated sulfuric acid, and then magnetically stir at 80°C for 1h to obtain a dispersion. Add 2.0g of KMnO 4 After grinding, gradually add to the dispersion liquid, then dilute the above mixture with 100mL deionized water, and let stand for 36h; centrifuge the diluted mixture, wash with deionized water and ethanol several times, and obtain HFAC by freeze-drying for 20h;

[0038] (2) Disperse 0.03g HFAC in 20mL ethanol and sonicate for 30 minutes, which is recorded as solution A; by continuous stirring, 0.24g Na 2 MoO 4 and 0.45g C 2 h 5 NS was completely dissolved in 10 mL deionized water until a clear solution B was formed;

[0039] (3) Add solution A to solution B, stir it magnetically for 1 hour, then transfer the resulting liquid to a high-pressure reactor, heat it to 200 degrees Celsius at a heating rate of 5 degrees Celsius / min, keep it warm for 20 hours, and after c...

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Abstract

The invention discloses a tremella-like MoS2 / functionalized activated carbon sodium-ion battery negative electrode material and a preparation method thereof, firstly, activated carbon is subjected to surface treatment by using an improved Hummers method, and the obtained functionalized activated carbon is rougher in surface and rich in active functional groups; then, the Mo source and the S source are nucleated and grow on nucleation sites in the heating process through a one-step solvothermal method, the surface of the HFAC is gradually covered, the synthesized MoS2 / HFAC is of a tremella-shaped structure, the surface of the synthesized MoS2 / HFAC is full of MoS2 nanosheets, the HFAC is used for fixing the nanostructure of MoS2 and ensuring good dispersity, the HFAC and MoS2 are connected through a C-O-Mo bond, stable interface bonding is achieved. According to the present invention, the structure collapse caused by sheet layer stacking is effectively relieved, the stability of the composite material is improved, the method has characteristics of simple operation, low cost, high yield and good repeatability, and the material has characteristics of high specific capacity and excellent cycle stability when the material is used as the sodium ion battery negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for sodium ion batteries, and in particular relates to tremella-like MoS 2 / Functional activated carbon sodium ion battery negative electrode material and preparation method. Background technique [0002] Over the years, lithium-ion batteries have been extensively studied and applied to portable electronic devices. Lithium-ion batteries also have potential applications, such as hybrid electric vehicles and all-electric vehicles. However, lithium resources are currently limited and distributed worldwide. Uneven and overpriced. With the rise of the electric vehicle industry, the resource consumption of lithium in the battery industry accounts for an increasing proportion of the total global lithium resource consumption, resulting in rising costs of lithium-ion batteries, unable to meet the growing market demand for lithium-ion batteries, and facing a shortage of supply. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/5815H01M4/625H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 许占位严皓刘鑫悦陆凡宇王盈任宇川赵家祺黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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