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Sulfur-spore carbon/niobium carbide composite electrode material and preparation method and application thereof

A composite material and composite electrode technology, which is used in nanotechnology, battery electrodes, circuits, etc. for materials and surface science to achieve the effects of improving adsorption, accelerating interface reactions, and improving electrochemical performance.

Active Publication Date: 2019-04-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems in the background technology, the object of the present invention is to provide a sulfur-spore carbon / niobium carbide composite electrode material and its preparation method and application, to synthesize a high-capacity sulfur-spore carbon / niobium carbide composite electrode material, through high conductivity Synergistic optimization of polar spore carbon substrates and polar niobium carbide nanoparticles to suppress the shuttle problem of polysulfides and improve the rate and cycle performance of lithium-sulfur batteries

Method used

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  • Sulfur-spore carbon/niobium carbide composite electrode material and preparation method and application thereof
  • Sulfur-spore carbon/niobium carbide composite electrode material and preparation method and application thereof
  • Sulfur-spore carbon/niobium carbide composite electrode material and preparation method and application thereof

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Embodiment 1

[0048] Trichoderma spores were obtained using cottonseed hulls as nutrients, and 2.0 g of Trichoderma spore carbon was weighed in a hydrothermal reaction kettle. Using niobium pentachloride (NbCl 5 ) was used as a precursor for solvothermal reaction at 200°C for 6h, and then cooled with the furnace. The obtained samples were washed several times with deionized water and absolute ethanol and dried. Under the protective atmosphere of argon, they were treated at 800°C and 1000°C for 2 hours respectively, and the heating rate was 5°C / min to obtain spore carbon / niobium carbide composite materials. . Mix the spore carbon / niobium carbide composite material and sulfur element evenly, then put it into a high-pressure reactor, heat it to 120-140°C, and the reaction time is 16 hours. After the reactor cools down, take out the reaction product to obtain sulfur-spore carbon / Niobium carbide composites.

Embodiment 2

[0050] Using sawdust as a nutrient to obtain Trichoderma spores, weigh 2.0 g of Trichoderma spore carbon in a hydrothermal reaction kettle. Using niobium pentachloride (NbCl 5 ) was used as a precursor for solvothermal reaction at 200°C for 9 h, and then cooled with the furnace. The obtained samples were washed several times with deionized water and absolute ethanol and dried. Under the protective atmosphere of argon, they were treated at 800°C and 1000°C for 2 hours respectively, and the heating rate was 5°C / min to obtain spore carbon / niobium carbide composite materials. . Mix the spore carbon / niobium carbide composite material and sulfur element evenly, then put it into a high-pressure reactor, heat it to 140-150°C, and the reaction time is 14 hours. After the reactor cools down, take out the reaction product to obtain sulfur-spore carbon / Niobium carbide composites.

Embodiment 3

[0052] Trichoderma spores were obtained using wood segments as nutrients, and 2.0 g of Trichoderma spore carbon was weighed in a hydrothermal reaction kettle. Using niobium pentachloride (NbCl 5 ) as a precursor for solvothermal reaction at 200°C for 12 hours, and then cooled with the furnace. The obtained samples were washed several times with deionized water and absolute ethanol and dried. Under the protective atmosphere of argon, they were treated at 800°C and 1000°C for 2 hours respectively, and the heating rate was 5°C / min to obtain spore carbon / niobium carbide composite materials. . Mix the spore carbon / niobium carbide composite material and sulfur element evenly, then put it into a high-pressure reactor, heat it to 160-170°C, and the reaction time is 12 hours. After the reactor cools down, take out the reaction product to obtain sulfur-spore carbon / Niobium carbide composites.

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Abstract

The invention discloses a sulfur-spore carbon / niobium carbide composite electrode material and a preparation method and an application thereof. The preparation method includes the following steps: obtaining trichoderma spores; synthesizing a spore carbon / niobium carbide composite material through 6h, 9h and 12h solvothermal methods and high-temperature carbonization; and carrying out reaction for12-16h through a melt sulfurizing method by taking the spore carbon / niobium carbide composite material as a carrier, and compositing the spore carbon / niobium carbide composite material with elementalsulfur to obtain a sulfur-spore carbon / niobium carbide composite material electrode. The sulfur-spore carbon / niobium carbide composite material electrode of the invention is of a three-dimensional porous structure, has the advantages of high specific surface area, high cycle stability and high rate performance and Coulomb efficiency, and is especially suitable for being used as a lithium-sulfur battery cathode material. The composite cathode improves the rate performance and cycle performance of lithium-sulfur batteries, and helps to promote the development of lithium-sulfur batteries with high energy density and high stability.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery cathode materials, in particular to a sulfur-spore carbon / niobium carbide composite electrode material, a preparation method thereof, and an application as a lithium-sulfur battery cathode material. Background technique [0002] At this stage, lithium-ion batteries are the most widely used commercially. However, with the continuous development of electric vehicles and high-quality power equipment, the energy density of lithium-ion batteries can only be maintained at 200-250Wh / kg, which cannot meet the needs of high-energy-density batteries. Therefore, it is becoming more and more important to explore new battery materials with high energy density far exceeding that of lithium-ion batteries. Lithium-sulfur batteries, with an energy density of 2600Wh / kg and a volume density of 2800Wh / L, have attracted widespread attention. The sulfur cathode has a theoretical capacity of 1675mAh / g, is cheap a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 夏新辉沈盛慧邓盛珏王秀丽涂江平
Owner ZHEJIANG UNIV
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