Lithium-sulfur battery with conductive adsorption layer, and application of conductive polymer film

A conductive polymer, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of high use cost, short cycle life, low Coulombic efficiency, etc., and achieve increased conductivity and cheap raw materials. , the preparation method is simple

Inactive Publication Date: 2014-01-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of low coulombic efficiency, short cycle life due to side reactions, and high cost of use in lithium-sulfur batteries with su

Method used

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  • Lithium-sulfur battery with conductive adsorption layer, and application of conductive polymer film
  • Lithium-sulfur battery with conductive adsorption layer, and application of conductive polymer film
  • Lithium-sulfur battery with conductive adsorption layer, and application of conductive polymer film

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of conductive polymer polyaniline (PANI) adsorption layer:

[0033] Conductive polymer PANI, conductive carbon black and polytetrafluoroethylene (PTFE) were mixed uniformly in deionized water at a mass ratio of 8:1:1, heated and stirred in a water bath for 2 hours to form a slurry with a solid content of 80%, and then The slurry was rolled repeatedly on a roller machine to form a film with a thickness of 0.5mm, dried in a vacuum oven at 70°C for 12h, and then cut into small discs with a diameter of 1.0cm to obtain a conductive polymer PANI adsorption layer. The SEM image of the conductive polymer PANI adsorption layer is as follows figure 1 shown.

[0034] Preparation of lithium-sulfur battery:

[0035]Mix elemental sulfur, conductive carbon black (SP), and polyvinylidene fluoride (PVDF) in N-methylpyrrolidone (NMP) solvent at a mass ratio of 8:1:1 to form a slurry with a solid content of 30% as The positive electrode material is coated on the aluminum fo...

Embodiment 2

[0037] Preparation of conductive polymer polypyrrole (PPy) adsorption layer:

[0038] Mix conductive polymer PPy, carbon nanotubes and PVDF in NMP at a mass ratio of 5:4:1, heat and stir in a water bath for 1 hour to form a slurry with a solid content of 50%, and then repeatedly place the slurry on a double-roll machine Rolled into a film with a thickness of 0.1mm, dried in a vacuum oven at 60°C for 20h, and then cut into small discs with a diameter of 1.2cm to obtain the conductive polymer PPy adsorption layer.

[0039] Preparation of lithium-sulfur battery:

[0040] Mix elemental sulfur, SP, and PVDF in NMP solvent at a mass ratio of 7:2:1 to form a slurry with a solid content of 30% as the positive electrode material, which is coated on the aluminum foil positive electrode current collector, and placed in a vacuum drying oven for 60 After drying at ℃ for 12 hours, it was pressed into a positive electrode piece with a diameter of 1.0 cm; the conductive polymer PPy adsorptio...

Embodiment 3

[0042] Preparation of conductive polymer poly(paraphenylene vinylene) (PEDOT) adsorption layer:

[0043] Mix conductive polymer PEDOT, carbon fiber and PAA in deionized water at a mass ratio of 5:1:4, heat and stir in a water bath for 5 hours to form a slurry with a solid content of 60%, and then repeatedly grind the slurry on a double-roll machine Press it into a film with a thickness of 1.5mm, dry it in a vacuum oven at 100°C for 10h, and then cut it into small discs with a diameter of 1.5cm to obtain the conductive polymer PEDOT adsorption layer.

[0044] Preparation of lithium-sulfur battery:

[0045] Mix elemental sulfur, SP, and PVDF in NMP solvent at a mass ratio of 6:2:2 to form a slurry with a solid content of 30% as the positive electrode material, which is coated on the aluminum foil positive electrode current collector, and placed in a vacuum drying oven for 60 After drying at ℃ for 12 hours, it was pressed into a positive electrode sheet with a diameter of 1.0 cm...

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Abstract

The invention discloses a lithium-sulfur battery with a conductive adsorption layer, and an application of a conductive polymer film. The lithium-sulfur battery comprises a sulfur-containing positive electrode sheet, a separation film, and a lithium negative-electrode sheet. A conductive absorption layer is arranged between the sulfur-containing positive electrode sheet and the separation film. The application comprises that the conductive polymer film prepared from a conductive polymer, a conductive agent, and an adhesive is arranged as a conductive absorption layer between the sulfur-containing positive electrode sheet and the separation film of the lithium-sulfur battery, such that the lithium-sulfur battery is prepared. The prepared lithium-sulfur battery has the characteristics of high specific capacity, high coulombic efficiency, and long service life. The conductive polymer film has the advantages of low raw material cost, simple preparation method, and suitability for industrialized productions.

Description

technical field [0001] The invention relates to a lithium-sulfur battery with a conductive adsorption layer and the application of a conductive polymer film, and belongs to the technical field of lithium-sulfur battery systems. Background technique [0002] Sulfur was first proposed in 1962 as a positive electrode material for batteries, and then the earliest Li-S batteries appeared. When applied to secondary lithium batteries, it is assumed that Li is completely generated during discharge 2 S, then the theoretical specific capacity of sulfur is 1672mAh g -1 , the theoretical discharge voltage is 2.287V, and the theoretical energy density of the electrode of the secondary lithium-sulfur battery is 2600Wh kg -1 , which is currently known as the secondary lithium battery system with the highest energy density except lithium oxygen. [0003] There are two discharge plateaus in the discharge process of a typical secondary lithium-sulfur battery. The first discharge platform ...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M4/62H01M2/16H01M50/403H01M50/426H01M50/491
CPCH01M4/66H01M10/052Y02E60/10
Inventor 方静李强张凯覃富荣李劼张治安赖延清贾明
Owner CENT SOUTH UNIV
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