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Lithium-sulfur battery cathode material as well as preparation method thereof and application thereof

A technology for lithium-sulfur batteries and positive electrode materials, which is applied in the manufacture of battery electrodes, lithium batteries, and electrolyte batteries, etc., can solve problems such as energy density limitations, and achieve the effects of enhancing charge transfer, accelerating transfer and transmission, and improving conductivity

Active Publication Date: 2020-06-19
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the energy density of traditional lithium-ion batteries (400W h kg-1) still has certain limitations.

Method used

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  • Lithium-sulfur battery cathode material as well as preparation method thereof and application thereof
  • Lithium-sulfur battery cathode material as well as preparation method thereof and application thereof
  • Lithium-sulfur battery cathode material as well as preparation method thereof and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Synthesis of zinc sulfide quantum dot-modified carboxylated multi-walled carbon nanotubes (ZnS-QDs / CNT): 0.1 g of carboxylated multi-walled carbon nanotubes with an outer diameter of 30-40 nm and an inner diameter of 10-20 nm The tubes were dispersed in 80mL deionized water, and then ultrasonicated for 20min to obtain an aqueous dispersion of carboxylated multi-walled carbon nanotubes; 0.068g of anhydrous zinc acetate and 0.312g of thioacetamide (TAA) were added to the resulting carboxylated multi-walled carbon nanotubes Stir in the water dispersion for 40min; transfer the stirred liquid to the reaction kettle, react at 50°C for 5h, then cool to room temperature, centrifuge, and then wash repeatedly with deionized water and ethanol, and finally in the 80°C Dry in a vacuum oven for 10 hours.

[0033] figure 1 For the SEM figure of the carboxylated multi-walled carbon nanotubes used in this embodiment, according to figure 1 It is shown that carboxylated multi-walled...

Embodiment 2

[0049] (1) Synthesis of zinc sulfide quantum dot-modified carboxylated multi-walled carbon nanotubes (ZnS-QDs / CNT): 0.15 g of carboxylated multi-walled carbon nanotubes with an outer diameter of 30-40 nm and an inner diameter of 10-20 nm Disperse in 80mL deionized water, and then sonicate for 20min to obtain an aqueous dispersion of carboxylated multi-walled carbon nanotubes; Stir in the dispersion for 40 minutes; transfer the stirred liquid to the reaction kettle, react at 50°C for 5h, then cool to room temperature, centrifuge, and then repeatedly wash with deionized water and ethanol, and finally dry in vacuum at 60°C Box drying for 10 hours.

[0050] (2) Preparation of ZnS-QDs / CNT / S: Take 0.2g of ZnS-QDs / CNT and 0.47g of sublimed sulfur and grind them in an agate mortar for 30min, then place the ground powder in an inert gas atmosphere in a glove box Put it into the reaction kettle, and finally place the reaction kettle in a blast drying oven at 165°C for 15 hours.

[005...

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Abstract

The invention belongs to the technical field of battery materials. The invention discloses a lithium-sulfur battery positive electrode material as well as a preparation method thereof and applicationthereof. The preparation method comprises the following steps: adding anhydrous zinc acetate and thioacetamide into deionized water containing carboxylated multi-walled carbon nanotubes, obtaining a ZnS-QDs / CNT composite material through violent stirring, heating treatment and repeated washing with absolute ethyl alcohol and deionized water, and finally preparing a ZnS-QDs / CNT / S composite materialthrough melt impregnation and sulfur fixation. The invention discloses the positive electrode material of a lithium-sulfur battery. Zinc sulfide quantum dots are uniformly distributed on inner and outer surfaces of one-dimensional nanostructured carboxylated multi-walled carbon nanotubes such that the cycling stability and rate capability of the lithium-sulfur battery can be improved, the shuttleeffect problem is inhibited, the charge transfer is enhanced, the oxidation-reduction kinetics is accelerated, and the electrochemical performance of the battery is improved. A lithium-sulfur batterytaking the positive electrode material as a positive electrode has excellent conductivity, electrochemical performance, good cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a lithium-sulfur battery positive electrode material and a preparation method and application thereof. Background technique [0002] Today's emerging large-scale energy storage and electric vehicle technologies require batteries with higher energy densities, and lithium-sulfur batteries, which are widely regarded as one of the most advanced batteries, because of their high theoretical specific capacity (1675mA h g -1 ), high theoretical energy density (2600W h kg -1 ), environmental protection and low cost have received a lot of attention. But the energy density of traditional Li-ion batteries (400W h kg -1 ) still has certain limitations. The improvement and enhancement of the performance of lithium-sulfur batteries need to pay attention to several key issues, including: the insulation of the active material sulfur and the product lithium sulfide; the sh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/058
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 尹海宏施天宇赵晨媛印川王志亮宋长青秦琳张振娟
Owner NANTONG UNIVERSITY
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