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Positive electrode of lithium-sulfur battery using nitride/carbon nano tube as interlayer, battery and preparation method

A carbon nanotube, lithium-sulfur battery technology, applied in the field of electrochemistry, can solve the problems of harsh production conditions, battery capacity decay, complicated and cumbersome processes, etc., and achieves the effects of simple preparation, improved electrical conductivity, and broad application prospects.

Inactive Publication Date: 2019-03-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above methods limit the dissolution of polysulfides to a certain extent and improve the cycle stability of the battery, the process is often complex and cumbersome, the production conditions are harsh, and the problem of battery capacity decay cannot be well solved.

Method used

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  • Positive electrode of lithium-sulfur battery using nitride/carbon nano tube as interlayer, battery and preparation method
  • Positive electrode of lithium-sulfur battery using nitride/carbon nano tube as interlayer, battery and preparation method

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preparation example Construction

[0037] The preparation method of the nitride / carbon nanotube interlayer is: ultrasonically disperse the nitride and carbon nanotube in ethanol, and separate the nitride / carbon nanotube composite by centrifugation, wherein the mass fraction of the carbon nanotube is nitride / carbon nanotube 10% to 90% of the total mass of carbon nanotubes; mix the nitride / carbon nanotube compound and the binder according to the mass ratio (7-9): (1-3), add an organic solvent and stir after mixing The slurry is uniformly obtained, and the slurry is evenly coated on the positive electrode sheet, and the thickness of the slurry coated on the aluminum current collector is 100-400 μm. Vacuum drying at 40-70°C to obtain a nitride / carbon nanotube interlayer; wherein, the amount of the added organic solvent is 10-30 times the mass of the added sulfur-containing active material.

[0038] The conductive agent is one or more of conductive carbon black Ketjen Black, Super P, Super C65, acetylene black, grap...

Embodiment 1

[0049] A lithium-sulfur battery with nitride / carbon nanotubes as the positive electrode separator, including a sulfur-containing active material positive electrode, a separator, an electrolyte, and a metal lithium negative electrode; a layer of nitride / carbon nanotubes is coated on the sulfur-containing active material positive electrode Composite compartment.

[0050] The preparation method of the positive electrode of the sulfur-containing active material is: conductive carbon black Ketjen black / sulfur compound (the mass fraction of sulfur in the conductive carbon black Ketjen black / sulfur compound is 50%) as the sulfur-containing active material, acetylene black as the conductive Agent and binder (PVDF) are mixed at a mass ratio of 8:1:1. During the mixing process, 3mL of organic solvent N-methylpyrrolidone is added, and stirred at a medium speed of 500r / min for 1h to obtain a slurry; then use an adjustable Scraper, set the coating conditions: the coating thickness is 350 μ...

Embodiment 2

[0064] Preparation method of sulfur-containing active material positive electrode:

[0065] Conductive carbon black Ketjen black / sulfur compound (the mass fraction of sulfur in the conductive carbon black Ketjen black / sulfur compound is 50%) is a sulfur-containing active material, acetylene black is a conductive agent, and the binder (PVDF) is based on mass Mix the materials at a ratio of 8:1:1, add 3mL of organic solvent N-methylpyrrolidone during the mixing process, and stir at a medium speed of 500r / min for 1h; then, use an adjustable scraper to set the coating conditions: the coating thickness is 350μm , the coating width is 400mm, the slurry is uniformly coated on the aluminum current collector, and the current collector is placed in a vacuum oven at 60°C for 24 hours to obtain a positive electrode material containing a sulfur active material.

[0066] Interlayer preparation method:

[0067] Lithium nitride / multi-walled carbon nanotubes (mass fraction of multi-walled car...

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Abstract

The invention discloses a positive electrode of a lithium-sulfur battery using a nitride / carbon nano tube as an interlayer, the battery and a preparation method. The preparation method comprises the following steps: preparing a nitride / carbon nano tube interlayer on the sulfur-containing positive electrode to form the positive electrode of the lithium-sulfur battery using the nitride / carbon nano tube as the interlayer; and carrying out assembling in an inert atmosphere to obtain the lithium-sulfur battery using the nitride / carbon nano tube as the interlayer, wherein the lithium-sulfur batteryusing the nitride / carbon nano tube as the interlayer comprises a positive electrode shell, the positive electrode of the lithium-sulfur battery using the nitride / carbon nano tube as the interlayer, adiaphragm, an electrolyte, a metallic lithium negative electrode and a negative electrode shell from bottom to top in sequence. The electrical conductivity of the positive electrode is improved, the transmission rate of lithium ions is promoted and the overall impedance of the battery is reduced by introducing the carbon nano tube with extremely high electron transport capacity and certain physical absorption capacity, and the diffusion of polysulfide is effectively limited inside the interlayer by adding nitrides with extremely high chemical adsorption capacity of polysulfide, so that the purposes of effectively relieving aero effect and improving the cycle performance of the battery are reached.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a positive electrode of a lithium-sulfur battery using a nitride / carbon nanotube as an interlayer, a battery and a preparation method. Background technique [0002] As the global energy shortage continues to intensify, the development and utilization of new energy technologies is imminent, thus promoting the rapid development of the electrochemical energy storage industry. However, the capacity of the existing widely commercialized energy storage equipment - the secondary battery is not high enough, and gradually cannot meet the growing market demand. The lithium-sulfur battery has an ultra-high specific capacity (1675mAh g -1 ) and high specific energy (2600Wh / Kg), and its raw material sulfur is abundant in the earth, cheap, and safe and pollution-free, so it is considered to be one of the secondary batteries with the most development potential in the futur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/052H01M10/058
CPCH01M4/13H01M4/625H01M4/628H01M10/052H01M10/058Y02E60/10Y02P70/50
Inventor 李明涛刘沛屈龙
Owner XI AN JIAOTONG UNIV
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