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Crescent MoS2/oxidized pomace carbon sodium ion battery negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory material performance, complicated preparation process, unfriendly environment, etc., achieve excellent sodium storage performance, simple operation, The effect of improving the stability of sodium storage

Inactive Publication Date: 2021-12-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum disulfide (MoS 2 ) has a S-Mo-S sandwich layered structure, and there is a weak van der Waals force between the layers, which is conducive to ion intercalation and extraction, and its theoretical specific capacity is high (670mAh g -1 ), but MoS 2 Poor conductivity and MoS 2 Easy to superimpose and lead to poor cycle performance and other disadvantages
For example, the three-dimensional nanoflower-like MoS prepared by Luo et al. 2 / carbon (MoS 2 / C NF), MoS prepared by Wu et al. 2 / C microspheres are assembled into sodium-ion batteries. The preparation process of related technologies is relatively complicated, the cost is high, and it is not friendly to the environment. The properties of the prepared materials cannot meet the needs.

Method used

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  • Crescent MoS2/oxidized pomace carbon sodium ion battery negative electrode material and preparation method thereof
  • Crescent MoS2/oxidized pomace carbon sodium ion battery negative electrode material and preparation method thereof
  • Crescent MoS2/oxidized pomace carbon sodium ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0028] The present invention provides a crescent MoS 2 The preparation method of oxidized pomace carbon sodium ion battery negative electrode material specifically comprises the following steps:

[0029] (1) preparing oxidized pomace carbon by the Hummers method, comprising the following steps:

[0030] (a) Weigh pomace carbon and sodium nitrate with a mass ratio of (2-6):1 and put them into concentrated sulfuric acid, specifically put 1.40-4.20 g of pomace carbon and 0.70 g of sodium nitrate in a beaker of 35-98 mL of concentrated sulfuric acid Put it in an ice bath to cool, keep it at 0°C for 0.5-2.5h, then slowly add 5.0-17.0g of potassium permanganate to it, and stir at 10°C for 1h;

[0031] (b) Transfer the beaker to a constant temperature water bath at 35°C and stir for 2 hours;

[0032] (c) Slowly add 196-531mL of ultra-pure water, continue stirring at 98°C for 2 hours, then add 100-180mL of 30% hydrogen peroxide solution while stirring until the bubbles disappear, to...

Embodiment 1

[0040] Include the following steps:

[0041] (1) preparing oxidized pomace carbon by the Hummers method, comprising the following steps:

[0042] (a) Weigh 1.40g of pomace carbon and 0.70g of sodium nitrate in a beaker of 35mL of concentrated sulfuric acid, put it in an ice bath and cool it at 0°C, keep it for 0.5h, slowly add 5.0g of potassium permanganate to it, at 10 ℃ stirring reaction for 1h;

[0043] (b) Transfer the beaker to a constant temperature water bath at 35°C and stir for 2 hours;

[0044] (c) Slowly add 196mL of ultrapure water, continue stirring at 98°C for 2h, then add 100mL of 30% hydrogen peroxide while stirring until the bubbles disappear, to remove unreacted potassium permanganate;

[0045] (d) centrifuge at 2500rpm while it is hot, centrifuge the filtrate and decant the supernatant, then use 50mL of 5% HCl and deionized water in turn to wash the remaining solid material at least three times until neutral;

[0046] (e) Subsequently, the material is dri...

Embodiment 2

[0050] Include the following steps:

[0051] (1) preparing oxidized pomace carbon by the Hummers method, comprising the following steps:

[0052] (a) Weigh 2.1g of pomace carbon and 0.70g of sodium nitrate in a beaker of 50mL of concentrated sulfuric acid, put it in an ice bath and cool it at 0°C, keep it for 1h, slowly add 8.0g of potassium permanganate to it, and heat it at 10°C The reaction was stirred for 1 h.

[0053] (b) Transfer the beaker to a constant temperature water bath at 35°C and stir for 2 hours;

[0054] (c) Slowly add 280mL of ultrapure water, continue stirring at 98°C for 2 hours, then add 120mL of 30% hydrogen peroxide and stir until the bubbles disappear, so as to remove unreacted potassium permanganate;

[0055] (d) centrifuge at 2500rpm while it is hot, centrifuge the filtrate and decant the supernatant, then wash the remaining solid material with 5% HCl 70mL and deionized water successively for at least three times until neutral;

[0056] (e) Subsequ...

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Abstract

The invention discloses a crescent MoS2 / oxidized pomace carbon sodium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: preparing oxidized pomace carbon by a Hummers-like method; placing the oxidized pomace carbon as a carbon source and ammonium molybdate as a molybdenum source in water, stirring, and evaporating to dryness to obtain a preform; uniformly mixing the prefabricated body and sulfur powder for high-temperature solid-phase reaction to prepare the three-dimensional oxidized pomace carbon-supported crescent-shaped MOS2 negative electrode material, so that the volume expansion can be relieved, the electrolyte can be fully permeated, the short sodium ion and electron transmission distance is ensured, and the excellent sodium storage performance is shown; and the prepared material has high specific capacity and excellent cycling stability. The used carbon source is oxidized pomace carbon, pomace is recycled, and the hydrothermal-solid phase method is easy to operate, low in energy consumption, high in repeatability and suitable for large-scale production and preparation and has remarkable scientific significance in the aspect of sodium ion battery application.

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 a crescent-shaped MoS 2 Oxidized pomace carbon sodium ion battery negative electrode material and preparation method. Background technique [0002] Lithium-ion batteries have been widely used in daily life, but the large-scale application of lithium-ion batteries is limited by the shortage of lithium resources. Compared with lithium, sodium resources are widely distributed, with high reserves and low cost, so sodium-ion batteries are expected to become one of the substitutes for lithium-ion batteries. Molybdenum disulfide (MoS 2 ) has a S-Mo-S sandwich layered structure with weak van der Waals force between layers, which is conducive to ion intercalation and extraction, and its theoretical specific capacity is high (670mAh g -1 ), but MoS 2 Poor conductivity and MoS 2 Easy superimposition leads to disadvantages ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58
CPCH01M4/362H01M4/5815H01M4/48Y02E60/10
Inventor 许占位王盈付豪陆凡宇王玺严皓陈思雨黄剑锋
Owner SHAANXI UNIV OF SCI & TECH
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