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Multi-layer electrode structure for lithium sulfur battery and preparation method thereof

A technology for multi-layer electrodes and lithium-sulfur batteries, applied in battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of poor cycle stability and low sulfur utilization rate, achieve simple and easy process, and realize stable cycle Effect

Inactive Publication Date: 2018-10-09
四川华昆能源有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first purpose of the present invention here is to provide a multilayer electrode structure for lithium-sulfur batteries that can solve the problems of low sulfur utilization and poor cycle stability in lithium-sulfur batteries with high sulfur content and high sulfur loading

Method used

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  • Multi-layer electrode structure for lithium sulfur battery and preparation method thereof
  • Multi-layer electrode structure for lithium sulfur battery and preparation method thereof
  • Multi-layer electrode structure for lithium sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Select a porous aluminum foil current collector (50% porosity), select carbon fibers with a diameter of 7 microns to disperse in an ethanol-water mixed solution and spray on the surface of the selected current collector, evaporate the solvent at 60 degrees to obtain a loose porous layer on the electrode surface , the thickness of the coating is 25 microns, and the porosity is 85%.

[0044] Choose the graphene sample of comparative example, be dispersed in N-methylpyrrolidone (NMP) with elemental sulfur, polyvinylidene fluoride in the ratio of mass ratio 5:85:10, will be mixed with graphene sample, elemental sulfur and polyvinylidene fluoride N-methylpyrrolidone (NMP) of vinyl fluoride is fully mechanically mixed and scraped on the surface of the above electrode, dried in vacuum at 100 degrees, and then mechanically rolled to obtain an electrode sheet with a thickness of 250 microns. The graphene oxide aqueous solution was spray-coated on the surface of the electrode, an...

Embodiment 2

[0047] Select a copper foil current collector with holes (porosity 65%), select carbon fibers with a diameter of 6 microns to disperse in an ethanol-water mixed solution and spray on the surface of the selected current collector, and evaporate the solvent at 60 degrees to obtain a loose and porous electrode surface layer, the thickness of the coating is 20 microns, and the porosity is 64%.

[0048] Choose the graphene sample of comparative example, disperse in the acetonitrile solution with elemental sulfur, polyethylene oxide in the ratio of mass ratio 5:87:8, will be mixed with the N- Methylpyrrolidone (NMP) was fully mechanically mixed and scraped on the surface of the above electrode, dried in vacuum at 60°C, and then mechanically rolled to obtain an electrode sheet with a thickness of 265 microns. The graphene oxide aqueous solution was spray-coated on the surface of the electrode, and the D50 of the graphene oxide sheet was 47 microns. After drying, the final electrode w...

Embodiment 3

[0051] Select a porous aluminum foil current collector (porosity 45%), select carbon fibers with a diameter of 3 microns to disperse in an ethanol-water mixed solution and spray on the surface of the selected current collector, evaporate the solvent at 60 degrees to obtain a loose porous layer on the electrode surface , the thickness of the coating is 45 microns, and the porosity is 74%.

[0052] Select D50 as a 76 micron graphene sample, disperse it in the NMP solution with elemental sulfur and polyvinylidene fluoride in a mass ratio of 5:90:5, mix the N- Methylpyrrolidone (NMP) was fully mechanically mixed and scraped onto the surface of the electrode, dried in a vacuum at 100 degrees, and then mechanically rolled to obtain an electrode sheet with a thickness of 310 microns. The graphene oxide aqueous solution was sprayed on the surface of the electrode, and the D50 of the graphene oxide sheet was 220 microns. After drying, the final electrode was obtained, and the thickness...

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Abstract

The invention discloses a multi-layer electrode structure for a lithium sulfur battery and a preparation method thereof. The multi-layer electrode structure comprises a current collector (1) and a multi-layer covering layer attached to the current collector (1), wherein the multi-layer covering layer has a loose porous layer (2), a conductive skeleton layer (3) and a confinement layer (4) which covers an electrode surface, close to the current collector (1) along a direction perpendicular to the current collector (1). The loose porous layer in the multi-layer electrode structure has a large pore structure and a high porosity, and can fully contain a sulfur active material, electrolyte and a multi-sulfide-ion charge-discharge product; the conductive skeleton layer in the middle provides a high-activity reaction interface for a charge-discharge reaction of the lithium sulfur battery by using a large specific surface area; the confinement layer on the electrode surface limits the diffusion of multiple sulfide ions; and the multi-layer electrode structure provided by the invention solves the problems of low sulfur utilization rate and poor cycle stability under high sulfur content andhigh sulfur loading of the lithium sulfur battery.

Description

technical field [0001] The invention belongs to the fields of electrochemistry and batteries, in particular to the field of lithium-sulfur batteries, and relates to a novel multilayer electrode structure for lithium-sulfur battery cathodes and a method for preparing the electric multilayer electrode structure. Background technique [0002] At present, lithium-ion batteries are widely used in various portable electronic devices and electric vehicles, but with the continuous development of these devices, lithium-ion batteries based on graphite and intercalation compounds still cannot meet the needs of social development. In order to further expand the application prospects of lithium-ion batteries, batteries of various systems have attracted the attention of researchers. Among them, the lithium-sulfur battery has a high theoretical specific capacity of 1672mAh / g, which is almost 10 times the theoretical specific capacity of traditional cathode materials such as transition meta...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M4/66
CPCH01M4/13H01M4/139H01M4/667Y02E60/10
Inventor 何煦
Owner 四川华昆能源有限责任公司
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