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Method for manufacturing intermediate layer of conductive high polymer compound for lithium-sulfur batteries

A conductive high polymer and sulfur battery technology, which is applied in the field of electrochemistry, can solve the problems of reducing positive electrode active materials and reducing battery charge and discharge efficiency, so as to improve utilization rate, enhance material transmission and exchange, increase specific capacity and cycle The effect of stability

Inactive Publication Date: 2018-05-15
XIAN JIAOTONG LIVERPOOL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This eventually leads to the continuous reduction of positive electrode active materials and the continuous reduction of battery charge and discharge efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for manufacturing a conductive polymer-graphene oxide-porous carbon nanotube composite intermediate layer, comprising the following steps:

[0035] (1) Preparation of graphene oxide (GO@CP) with conductive polymer arrays grown on the surface

[0036]Add conductive high polymer monomer (including but not limited to aniline, pyrrole, etc.) solution. Graphene oxide powder (GO) was then added to the solution at a ratio of 1 mg:1 mL, and ultrasonically dispersed for 1 h to obtain a uniform suspension, called solution A. Add ammonium peroxide (APS) to 1 volume of 1 mol / L aqueous sulfuric acid solution, the amount of which is 4 times that of the conductive high polymer monomer in solution A, and then stir for 10 min to obtain solution B. After incubating solution A and solution B at -5°C for 30min, quickly add solution B to solution A, continue to incubate at -5°C and stir for 12h. The resulting solid was filtered and washed with deionized water until the pH of the...

Embodiment 2

[0048] A method for manufacturing a conductive polymer-graphene oxide-porous carbon nanotube composite intermediate layer, comprising the following steps:

[0049] (1) Preparation of graphene oxide (GO@CP) with conductive polymer arrays grown on the surface

[0050] Add conductive high polymer monomer (including but not limited to aniline, pyrrole, etc.) solution. Graphene oxide powder (GO) was then added to the solution at a ratio of 1 mg:1 mL, and ultrasonically dispersed for 1 h to obtain a uniform suspension, called solution A. Add ammonium peroxide (APS) to 1 volume of 1 mol / L aqueous sulfuric acid solution, the amount of which is 4 times that of the conductive high polymer monomer in solution A, and then stir for 10 min to obtain solution B. After incubating solution A and solution B at -5°C for 30min, quickly add solution B to solution A, continue to incubate at -5°C and stir for 12h. The resulting solid was filtered and washed with deionized water until the pH of th...

Embodiment 3

[0062] A method for manufacturing a conductive polymer-graphene oxide-porous carbon nanotube composite intermediate layer, comprising the following steps:

[0063] (1) Preparation of graphene oxide (GO@CP) with conductive polymer arrays grown on the surface

[0064] Add conductive high polymer monomer (including but not limited to aniline, pyrrole, etc.) solution. Graphene oxide powder (GO) was then added to the solution at a ratio of 1 mg:1 mL, and ultrasonically dispersed for 1 h to obtain a uniform suspension, called solution A. Add ammonium peroxide (APS) to 1 volume of 1 mol / L aqueous sulfuric acid solution, the amount of which is 4 times that of the conductive high polymer monomer in solution A, and then stir for 10 min to obtain solution B. After incubating solution A and solution B at -5°C for 30min, quickly add solution B to solution A, continue to incubate at -5°C and stir for 12h. The resulting solid was filtered and washed with deionized water until the pH of th...

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Abstract

The invention discloses a method for manufacturing the lithium-sulfur batteries with intermediate layers made from a conductive high polymer-oxidized graphene-porous carbon nanotube compound. The method includes steps: 1) growth preparation of a conductive high polymer nanorod array on oxidized graphene; (2) preparation of porous carbon nanotubes; (3) preparation of the lithium-sulfur batteries with intermediate layers made from the conductive high polymer-oxidized graphene-porous carbon nanotube compound. By adoption of the conductive high polymer-oxidized graphene-porous carbon nanotube compound for the intermediate layers, adoption of a great quantity of nano microporous structures on surfaces of the porous carbon nanotubes and adoption of the conductive high polymer nanorod array growing on an oxidized graphene film, electron transmittability in a battery charging-discharging process is greatly improved, the porous structure of the compound keeps lithium ion transmittability, and accordingly the utilization rate of positive active materials is increased. In addition, by a nitrogen-containing functional group of a conductive high polymer and an oxygen-containing functional groupon the surface of oxidized graphene, migration and dissolution of polysulfides formed in a discharging process to electrolyte solution can be effectively adsorbed, and cycle stability of the batteries is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a lithium-sulfur battery with an intermediate layer of a conductive high polymer-graphene oxide-porous carbon nanotube composite and a manufacturing method thereof. Background technique [0002] At present, the electric vehicle industry urgently needs a power source with a larger unit mass ratio capacity to increase the mileage after a single charge, which is the most important key technology for replacing traditional fossil fuel vehicles. The lithium-sulfur battery is a secondary chemical power source with sulfur as the positive electrode of the battery. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity of the widely used lithium cobalt oxide battery (<300mAh / g). At present, the electric vehicle industry, which urgently needs a power supply with a larger unit mass ratio than capacity, has great appeal. At the same time, the sulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/158
CPCH01M4/366H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 易若玮杨莉赵策州刘晨光赵胤超耿显葳
Owner XIAN JIAOTONG LIVERPOOL UNIV