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Lithium metal electrode surface oxidized composite protective layer structure and preparation method thereof

A lithium metal electrode, surface oxidation technology, applied to battery electrodes, structural parts, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor processing performance of solid electrolyte materials, failure of composite protective layer, and easy breakage, and simplify battery assembly process, improving cycle stability, and suppressing the effect of lithium dendrites

Active Publication Date: 2018-09-21
四川华昆能源有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This composite protective layer structure has lithium ion conductivity and can prevent direct contact between the lithium metal surface and the electrolyte. However, most composite protective layer technologies are not yet mature and cannot meet the needs of commercial lithium metal batteries.
Some composite protective layer designs are obtained by in-situ reaction of lithium metal and some compounds in the electrolyte, and most of the in-situ film formation methods are obtained by static growth after battery assembly. Usually, this composite protective layer has a porous structure. , allowing the electrolyte to penetrate, resulting in direct contact between the electrolyte and lithium metal, so this method is not perfect for the protection of lithium metal
Another way of ex-situ film formation is to pre-deposit a solid electrolyte layer on the surface of lithium metal, such as LiPON, Li 10 GeP 2 S 12 etc. Although this method can completely isolate the direct contact between lithium metal and electrolyte, this solid electrolyte material has poor processing performance, high cost, and is easy to break during battery charging and discharging and use, resulting in failure of the composite protective layer.

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  • Lithium metal electrode surface oxidized composite protective layer structure and preparation method thereof
  • Lithium metal electrode surface oxidized composite protective layer structure and preparation method thereof
  • Lithium metal electrode surface oxidized composite protective layer structure and preparation method thereof

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preparation example Construction

[0042] A method for preparing a lithium metal electrode surface oxidation composite protective layer structure, comprising the steps of:

[0043] A. Fully dispersing the graphene oxide powder in an organic solvent to obtain a dispersion;

[0044] B. Add thioether containing benzene functional groups into the dispersion, mix and dissolve to obtain a coating solution;

[0045] C. Spray coating the coating solution on the battery separator base, and evaporate the solvent to obtain a separator with a uniform coating.

[0046] Such as figure 1 As shown, the oxidation composite protective layer structure includes an electronically insulating two-dimensional sheet structure layer, and the two-dimensional sheet structure layer is compounded with phenylene sulfide organic molecules as a lithium ion conducting medium.

[0047] The organic solvent is carbon disulfide, tetrahydrofuran or benzene;

[0048] Further, it also includes the step: D. Cover the separator on the lithium metal e...

Embodiment 1

[0052] Take the single-layer graphene oxide powder prepared by oxidation exfoliation, the average sheet thickness of graphene oxide is 1.1nm, and the sheet size D50 is about 22 μm, and 6.0g of the above-mentioned graphene oxide powder is ultrasonically dispersed in a benzene solvent to obtain a uniform dispersion solution. Add 4.0 g of diphenyl disulfide to the solution, and dissolve it after mechanical stirring to obtain a uniform mixed solution. Spray the above solution on the surface of the battery separator substrate and transfer it to an oven to evaporate the solvent to obtain a uniform coating. The thickness of the coating is 5 μm. The prepared separator 1 with a composite protective layer 2 is covered on the surface of the lithium metal electrode 3, and rolled together with the current collector 4 to obtain a lithium-graphene oxide composite protective layer integrated electrode.

[0053] Using the above-mentioned lithium metal integrated electrode, a lithium-sulfur batt...

Embodiment 2

[0055] Take the single-layer graphene oxide powder prepared by oxidation exfoliation, the average sheet thickness of graphene oxide is 1.0nm, and the sheet size D50 is about 4.5 μm; ultrasonically disperse 2.0g of the above graphene oxide powder in a benzene solvent to obtain a uniform dispersion solution; Add 8.0 g of dinitrodiphenyl disulfide to the solution, and dissolve after mechanical stirring to obtain a uniform mixed solution; spray the above solution on the surface of the battery separator substrate and transfer it to an oven to evaporate the solvent to obtain a uniform coating. The thickness of the layer is 12 μm; the prepared separator with a composite protective layer is covered on the surface of the lithium metal electrode, and rolled together with the current collector to obtain a lithium-graphene oxide composite protective layer integrated electrode.

[0056] Using the above-mentioned lithium metal integrated electrode, a lithium-sulfur battery was assembled acco...

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Abstract

The invention belongs to the technical field of lithium metal electrode oxidation protection and discloses a lithium metal electrode surface oxidized composite protective layer structure and a preparation method thereof. The lithium metal electrode surface oxidized composite protective layer structure comprises a plurality of electronic insulated two-dimensional lamellar structural layers; a phenyl sulfide conducting layer is arranged between every two adjacent two-dimensional lamellar structural layers; the preparation method comprises the steps of A, dispersing graphene oxide powder fully inan organic solvent to obtain a dispersion; B, adding thioether with benzene functional groups into the dispersion, mixing well for dissolving to obtain a coating solution; C, spraying the coating solution to a battery diaphragm substrate, evaporatively drying the solvent to obtain a diaphragm with an even coating. Organic phenyl sulfide small molecules are introduced among the multiple two-dimensional lamellar structural layers; lithium ion transfer passages formed by S-S crosslinked structure that the resultant forms through spontaneous reaction; electrolyte and lithium metal can be isolatedfrom direct contact; cycle stability of lithium metal is improved.

Description

technical field [0001] The invention belongs to the technical field of oxidation protection of lithium metal electrodes, and in particular relates to a structure and a preparation method of an oxidation composite protective layer on the surface of lithium metal electrodes. Background technique [0002] At present, lithium-ion batteries, as the energy storage device with the highest energy density and the most mature technology, have been widely used in many fields such as portable electronic devices, electric vehicles, bicycles, and energy storage power stations. However, the energy density of the lithium-ion battery system based on the intercalation-extraction mechanism has reached the bottleneck, and it is difficult to further improve it, which cannot meet the demand for high-energy-density energy storage devices in the electric field and energy storage power station field. [0003] At this stage, a variety of high-energy-density energy storage device systems have been dev...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139
CPCH01M4/13H01M4/139Y02E60/10
Inventor 魏志凯闫新秀黄美灵张焕叶长英
Owner 四川华昆能源有限责任公司
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