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A kind of sulfur composite material for lithium-sulfur battery and preparation method thereof

A composite material, lithium-sulfur battery technology, applied in the field of electrochemistry, to achieve good cycle performance, improve utilization and electrochemical cycle performance, and alleviate the effects of structural collapse

Active Publication Date: 2021-11-05
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to obtain Li-S batteries with high energy density, the high sulfur loading characteristics of the electrodes are not the only condition

Method used

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  • A kind of sulfur composite material for lithium-sulfur battery and preparation method thereof
  • A kind of sulfur composite material for lithium-sulfur battery and preparation method thereof
  • A kind of sulfur composite material for lithium-sulfur battery and preparation method thereof

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Embodiment 1

[0031] This embodiment provides a method for preparing sulfur composite materials, such as figure 1 Shown is the schematic diagram of the preparation of the sulfur composite material in this embodiment, the steps are as follows:

[0032] 1) Add 5 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. 2g of nano-sulfur (20nm) was added to the above solution, dispersed by ultrasonic at 50°C for 2h, and then stirred for 12h.

[0033] 2) Add 0.2g graphene to 50mL ethanol, ultrasonically disperse for 2h; add 0.2g carbon nanotubes to 50mL ethanol, ultrasonically disperse for 2h; add 0.1g titanium dioxide (20nm) to 50mL ethanol, ultrasonically disperse for 2h. Under stirring, the titanium dioxide dispersion was added to the carbon nanotube dispersion, and stirred at 30° C. for 5 h; then the graphene dispersion was added to the above mixture, and the stirring was continued for 12 h to prepare a nanomaterial dispersion.

[00...

Embodiment 2

[0038] This embodiment provides a method for preparing a sulfur composite material, the steps of which are as follows:

[0039] 1) Add 3 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. Add 12g of sodium thiosulfate to the above solution, then slowly add 100mL of 2M formic acid solution dropwise under stirring, and then stir for 10h. Preparation of nano-sulfur dispersion.

[0040] 2) Add 0.2g graphene to 50mL deionized water, ultrasonically disperse for 2h; add 0.2g carbon nanotubes to 50mL deionized water, ultrasonically disperse for 2h; add 0.1g titanium nitride (20nm) to 50mL deionized water, Ultrasonic dispersion 2h. Under stirring, the titanium nitride dispersion was added to the carbon nanotube dispersion, and stirred at 30°C for 5 hours; then the graphene dispersion was added to the above mixture, and continued to stir for 12 hours to prepare the nanomaterial dispersion liquid.

[0041] 3) Slowly add t...

Embodiment 3

[0045] This embodiment provides a method for preparing a sulfur composite material, the steps of which are as follows:

[0046] 1) Add 3 g of polyvinylpyrrolidone to 100 mL of deionized water, and stir at 50° C. for 2 h to prepare a uniform solution. Add 15g of sodium thiosulfate to the above solution, then slowly add 120mL of 2M formic acid solution dropwise under stirring, and then stir for 10h. Preparation of nano-sulfur dispersion.

[0047] 2) Add 0.15g graphene to 100mL deionized water, ultrasonically disperse for 2h; add 0.15g carbon nanotubes to 100mL deionized water, ultrasonically disperse for 2h; add 0.3g titanium nitride (20nm) to 100mL deionized water, Ultrasonic dispersion 2h. Under stirring, the titanium nitride dispersion was added to the carbon nanotube dispersion, and stirred at 30°C for 5 hours; then the graphene dispersion was added to the above mixture, and continued to stir for 12 hours to prepare the nanomaterial dispersion liquid.

[0048] 3) Under u...

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Abstract

The invention relates to a sulfur composite material for lithium-sulfur batteries and a preparation method thereof. The sulfur composite material includes a carrier and an active material loaded on the surface of the carrier, the active material is sulfur, and the carrier is composed of nanoparticle materials, Composition of linear nanomaterials and layered nanomaterials. The present invention constructs a multi-dimensional carrier through nanomaterials with different microscopic morphology structures, which can significantly increase the content of active substance sulfur in the composite material, and form a good The electronically conductive network improves the charge-discharge cycle performance of lithium-sulfur batteries. The sulfur content in the multi-dimensional sulfur composite material prepared by the invention can be as high as over 90%, and the initial discharge specific capacity of the composite material can reach 1290mAh / g.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a sulfur composite material for lithium-sulfur batteries and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles, energy storage equipment and other fields, the requirements for battery energy density and cycle performance are more urgent. Lithium secondary batteries play a vital role in important strategic fields such as electric vehicles, power tools, smart grids, distributed energy systems, and national defense. As the current secondary battery system with the best comprehensive performance, lithium-ion batteries have the advantages of long cycle life, small self-discharge, and environmental friendliness. However, after more than 20 years of development, the lithium-ion battery has basically reached its theoretical energy density limit, and its development space is very limited. The secondary battery system to obtain hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M10/052Y02E60/10
Inventor 弓胜民张立赵尚骞杨容赵春荣孙浩博朱秀龙
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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