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Preparation method of carbon-sulfur composite positive electrode material added with auxiliary agent

A carbon-sulfur composite, cathode material technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of cycle stability deterioration, limited adsorption, battery capacity attenuation, etc., to enhance cycle stability and life, Improve utilization and reduce the effect of polarization

Pending Publication Date: 2020-05-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limited adsorption of non-polar carbon materials on polar polysulfides, as the number of charge-discharge cycles increases, polysulfides will still dissolve in the electrolyte and shuttle between the two electrodes, causing the capacity of the battery to decline rapidly. , the cycle stability keeps deteriorating

Method used

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  • Preparation method of carbon-sulfur composite positive electrode material added with auxiliary agent
  • Preparation method of carbon-sulfur composite positive electrode material added with auxiliary agent
  • Preparation method of carbon-sulfur composite positive electrode material added with auxiliary agent

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Mix porous carbon (CMK) and sublimated sulfur powder according to the mass ratio of 2:3 and grind until uniform; then heat the mixture to 155°C under the protection of argon in the ampoule bottle, and keep the constant temperature for 6 hours; wait for natural cooling After reaching room temperature, the gray-black powder is taken out, which is the CMK sulfur-supported composite material (CMK / S).

[0023] (2) The prepared CMK / S, graphene (N-methylpyrrolidone dispersion), PVDF and auxiliary agent dithiothreitol (DTT) are mixed in N-methyl Pyrrolidone was thoroughly mixed and stirred until uniform to obtain a slurry.

[0024] (3) The obtained slurry was coated on the surface of aluminum foil, vacuum-dried at 30° C. for 8 hours, and then cut to obtain a positive electrode sheet; further, sodium was used as a negative electrode to assemble a button battery.

[0025] The morphology of the as-prepared cathode material is shown in the attached figure 1 shown. The carbo...

Embodiment 2

[0027] (1) Mix carbon nanotubes and sublimed sulfur powder according to the mass ratio of 2:3 and grind them until they are uniform; then heat the mixture to 155°C under the protection of argon in the ampoule bottle, and keep the temperature for 6 hours; wait for natural cooling to room temperature Finally, take out the gray-black powder, which is the composite material of carbon nanotubes loaded with sulfur.

[0028] (2) The prepared carbon nanotube-loaded sulfur composite material, Ketjen black, PVDF and additive glutathione are fully mixed and stirred in N-methylpyrrolidone according to the mass ratio of 7:1:1:1 until uniform , to obtain a slurry.

[0029] (3) The obtained slurry was coated on the surface of aluminum foil, vacuum-dried at 60° C. for 5 hours, and then cut to obtain a positive electrode sheet; further, sodium was used as a negative electrode to assemble a button battery.

Embodiment 3

[0031] (1) Mix porous carbon (CMK) and sublimated sulfur powder according to the mass ratio of 2:3 and grind until uniform; then heat the mixture to 155°C under the protection of argon in the ampoule bottle, and keep the constant temperature for 6 hours; wait for natural cooling After reaching room temperature, the gray-black powder is taken out, which is the CMK sulfur-supported composite material (CMK / S).

[0032] (2) The prepared CMK / S, graphene (N-methylpyrrolidone dispersion), PVDF and auxiliary vitamin C are fully mixed and stirred in N-methylpyrrolidone according to the mass ratio of 7:1:1:1 until uniform.

[0033] (3) The obtained slurry was coated on the surface of aluminum foil, vacuum-dried at 60° C. for 5 hours, and then cut to obtain a positive electrode sheet; further, sodium was used as a negative electrode to assemble a button battery.

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Abstract

The invention relates to a preparation method of a carbon-sulfur composite positive electrode material added with an auxiliary agent. The method mainly adopts a sublimation method to compound a carbonmaterial and sulfur, and then the auxiliary agent and a composite material are effectively mixed in the process of preparing positive electrode material slurry. The auxiliary agent is added, so thatdisulfide bonds can be effectively cut off, the polysulfide is converted into sulfur, so that the probability of dissolution and shuttling of the polysulfide is reduced, the shuttling effect is relieved, the specific capacity of the room-temperature sodium-sulfur battery is improved, the polarization in the charging and discharging process is reduced, the cycling stability is enhanced, the servicelife is prolonged, and the electrochemical performance of the room-temperature sodium-sulfur battery is comprehensively improved.

Description

technical field [0001] The invention belongs to the field of sodium-sulfur batteries, and in particular relates to a preparation method of a carbon-sulfur composite cathode material with additives added. Background technique [0002] In recent years, in order to reduce environmental pollution and increase the utilization rate of renewable energy, human beings have put forward higher requirements for secondary energy storage systems. As a new type of chemical power source, sodium-sulfur battery has made great progress since its inception due to its small size, large capacity (theoretical specific energy is 760Wh / kg, actually greater than 150Wh / kg), long life, and high charge and discharge efficiency. , It is widely used in power energy storage for peak shaving and valley filling, emergency power supply, wind power generation, etc. And elemental sulfur has a high theoretical specific capacity, abundant reserves, low price, non-toxic and environmentally friendly, which can be ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054
CPCH01M4/362H01M4/38H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 罗维刘萌萌朱晓航
Owner DONGHUA UNIV
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