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Carbon@acrylonitrile-sulfide-based polymer composite cathode active material and preparation method thereof, cathode and preparation method thereof, and application of carbon@acrylonitrile-sulfide-based polymer composite cathode active material in lithium-sulfur battery

A technology for vulcanizing acrylonitrile and acrylonitrile group, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of reducing dosage, improving sulfur loading, and improving contact progress

Active Publication Date: 2019-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the performance of the existing cathode materials for lithium-sulfur batteries needs to be further improved

Method used

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  • Carbon@acrylonitrile-sulfide-based polymer composite cathode active material and preparation method thereof, cathode and preparation method thereof, and application of carbon@acrylonitrile-sulfide-based polymer composite cathode active material in lithium-sulfur battery
  • Carbon@acrylonitrile-sulfide-based polymer composite cathode active material and preparation method thereof, cathode and preparation method thereof, and application of carbon@acrylonitrile-sulfide-based polymer composite cathode active material in lithium-sulfur battery
  • Carbon@acrylonitrile-sulfide-based polymer composite cathode active material and preparation method thereof, cathode and preparation method thereof, and application of carbon@acrylonitrile-sulfide-based polymer composite cathode active material in lithium-sulfur battery

Examples

Experimental program
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preparation example

[0083] Tapioca starch is used as a carbon source, silica is used as a template, supplemented with conductive carbon black and surfactant polyvinylpyrrolidone, stirred and heated at 80-100°C for 2-6 hours to obtain a slurry, the slurry is first dried and then crushed, and then Carbonize at 800-1300°C, and the carbonized material is crushed again, pickled, washed with water, and dried to obtain a porous carbon material.

[0084] The weight ratio of tapioca starch and silica template is 20-40:80-60;

[0085] Conductive carbon black is 0.5-5% of the weight of biomass carbon source

[0086] The polyvinylpyrrolidone is 0.05-0.5% of the weight of the biomass carbon source.

[0087] The thin-walled porous carbon materials described in the following cases are all prepared by this method unless otherwise stated. Among them, the pore volume of the thin-walled porous carbon material used is 3.6cm 3 / g, the wall thickness is 4nm, the tap density is 0.15g / mL, and the conductivity is 10S / ...

Embodiment 1

[0089] The specific steps are:

[0090] (1) take by weighing 2g acrylonitrile-based polymer (PAN);

[0091] (2) dissolving the acrylonitrile-based polymer in 8g of N-methylpyrrolidone to prepare a polyacrylonitrile solution;

[0092] (3) Dispersing 2g of the thin-walled porous carbon material into the acrylonitrile-based polymer solution to obtain a homogeneous solution;

[0093] (4) drying the solution obtained in step (3) by spray drying at 150° C. to obtain porous carbon-acrylonitrile-based polymer microspheres with a particle size of 20 μm;

[0094] (5) uniformly mix the porous carbon-acrylonitrile-based polymer microspheres obtained in step (4) with sulfur at a mass ratio of 2:1, and then raise the temperature to 300°C at a heating rate of 2°C / min under the protection of a nitrogen atmosphere, After 2 hours of heat preservation, the carbon@sulfurized acrylonitrile-based polymer composite positive electrode active material was obtained.

[0095] The prepared composite p...

Embodiment 2

[0132] The specific steps are:

[0133] (1) take by weighing 2g acrylonitrile-based polymer (same as embodiment 1);

[0134] (2) Acrylonitrile-based polymer (same as Example 1) is dissolved in the N-methylpyrrolidone of 4g and is mixed with polyacrylonitrile solution;

[0135] (3) Dispersing 2g of the thin-walled porous carbon material into the acrylonitrile-based polymer solution to obtain a homogeneous solution;

[0136] (4) drying the solution obtained in step (3) by spray drying at 100° C. to obtain porous carbon-acrylonitrile-based polymer microspheres with a particle size of 10 μm;

[0137] (5) Evenly mix the porous carbon-acrylonitrile-based polymer microspheres obtained in step (4) with sulfur at a mass ratio of 1:1, then heat-treat under the protection of a nitrogen atmosphere, and heat up to 360 °C at a heating rate of 3 °C / min. ℃, heat preservation for 3 hours, and the carbon@sulfurized acrylonitrile-based polymer composite positive electrode active material was o...

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Abstract

The invention belongs to the field of lithium-sulfur battery electrode materials, and particularly relates to a carbon@acrylonitrile-sulfide-based polymer composite cathode active material. The material comprises a porous carbon material and an acrylonitrile-sulfide-based polymer filled in the pores of the porous carbon material in situ. The present invention further provides a preparation methodof an absorption, mist spray and vulcanization means of a solution. The cathode active material has the characteristics of tight combination of sulfur and carbon, good conductivity, high tap density and the like, and is further beneficial to remarkably improving the rate capability and the cycle performance of a lithium-sulfur battery prepared from the cathode active material.

Description

technical field [0001] The invention relates to the field of battery electrode material preparation, in particular to a lithium-sulfur battery cathode material. Background technique [0002] In recent years, with the development of the economy and the advancement of science and technology, energy issues and environmental issues have become the focus of everyone's attention. The excessive consumption of fossil fuels and the growth of energy demand make the development and utilization of clean energy extremely urgent. Therefore, the research on energy storage devices with high energy density is of great significance. [0003] Lithium-ion secondary battery is currently the preferred power source in the fields of digital and electric vehicle products, because it has the advantages of high energy density, high working voltage, long cycle life and no pollution. However, with the further development of society, the demand for electric vehicles and large-scale energy storage has c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/60H01M10/0525
CPCH01M4/362H01M4/583H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 张治安赖延清张林郑景强覃富荣张凯洪波
Owner CENT SOUTH UNIV
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