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Lithium-sulfur battery using nitride/graphene as separation layers, and positive electrode and preparation method thereof

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

Inactive Publication Date: 2018-10-09
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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  • Lithium-sulfur battery using nitride/graphene as separation layers, and positive electrode and preparation method thereof
  • Lithium-sulfur battery using nitride/graphene as separation layers, and positive electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A lithium-sulfur battery with nitride / graphene as the positive electrode separator, including a sulfur-containing active material positive electrode, a separator, an electrolyte, and a metal lithium negative electrode; the sulfur-containing active material positive electrode is coated with a layer of nitride / graphene composite compartment.

[0034] Preparation method of sulfur-containing active material positive electrode

[0035] Conductive carbon black Ketjen black / sulfur compound (50% sulfur) is the sulfur-containing active material, acetylene black is the conductive agent, and the binder (PVDF) is mixed at a mass ratio of 8:1:1, adding organic Solvent N-methylpyrrolidone 3ml, stir at a medium speed for 1h; then use an adjustable scraper to set the coating conditions: the coating thickness is 35μm, the coating width is 400mm, and the slurry is evenly coated on the aluminum current collector. The current collector was placed in a vacuum oven at 60° C. and dried for 2...

Embodiment 2

[0050] Preparation method of sulfur-containing active material positive electrode

[0051] Conductive carbon black Ketjen black / sulfur compound (50% sulfur) is the sulfur-containing active material, acetylene black is the conductive agent, and the binder (PVDF) is mixed at a mass ratio of 8:1:1, adding organic Solvent N-methylpyrrolidone 3ml, stir at a medium speed for 1h; then, use an adjustable scraper to set the coating conditions: the coating thickness is 35μm, the coating width is 400mm, and the slurry is evenly coated on the aluminum current collector , place the current collector in a vacuum oven at 60° C. and dry for 24 hours to obtain a positive electrode material containing a sulfur-containing active material.

[0052] Interlayer preparation method

[0053] Lithium nitride / graphene (graphene accounts for 40%) was dispersed in ethanol, ultrasonicated for 30 min, then stirred for 6 h, and the nitride / graphene composite was separated by centrifugation. Mix the nitride...

Embodiment 3

[0056] Preparation method of sulfur-containing active material positive electrode

[0057] Elemental sulfur, acetylene black as conductive agent, and binder (PVDF) are mixed at a mass ratio of 8:1:1. During the process, 3ml of organic solvent N-methylpyrrolidone is added, and stirred at a medium speed for 1h; then, use an adjustable Squeegee, set the coating conditions: the coating thickness is 35 μm, the coating width is 400 mm, the slurry is evenly coated on the aluminum current collector, and the current collector is placed in a vacuum drying oven at 60 ° C for 24 hours to obtain sulfur-containing positive electrode material for the active material.

[0058] Interlayer preparation method

[0059] Aluminum nitride / graphene (graphene accounts for 50%) was dispersed in ethanol, ultrasonicated for 30 min, then stirred for 6 h, and the nitride / graphene composite was separated by centrifugation. Mix the nitride / graphene composite and the binder (PVDF) according to the mass rati...

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Abstract

The invention discloses a lithium-sulfur battery using nitride / graphene as separation layers and a positive electrode and a preparation method thereof. The lithium-sulfur battery consists of a positive electrode, a diaphragm, an electrolyte and a negative electrode, wherein the positive electrode contains sulfur which is coated onto an aluminum foil; then, a layer of separation layer based on nitride / graphene is coated; due to the existence of the nitride and graphene in the separation layer; the conducting performance of the battery is improved; the diffusion of polysulfide can also be effectively inhibited, so that the shuttle effect can be effectively relieved; the electric chemical performance of the battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium-sulfur battery with nitride / graphene as an interlayer, its positive electrode and a preparation method. Background technique [0002] As the global energy shortage problem continues to intensify, the development of new energy technologies is imminent, along with potential markets in areas such as energy storage and electric vehicles. However, the capacity of existing commercialized secondary batteries 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 future. [0003] Although lithium-sulfur batteries have broad prospects fo...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/36H01M4/38H01M4/62H01M10/0525H01M10/058
CPCH01M4/13H01M4/139H01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李明涛刘沛屈龙
Owner XI AN JIAOTONG UNIV
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