Positive electrode of lithium-sulfur battery with multifunctional elastic protection layer

A lithium-sulfur battery, protective layer technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effect of alleviating structural damage and good stability

Inactive Publication Date: 2016-02-10
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to propose a lithium-sulfur battery positive electrode with a multifunctional elastic p...

Method used

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  • Positive electrode of lithium-sulfur battery with multifunctional elastic protection layer
  • Positive electrode of lithium-sulfur battery with multifunctional elastic protection layer
  • Positive electrode of lithium-sulfur battery with multifunctional elastic protection layer

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preparation example Construction

[0032] The preparation method of the positive electrode material layer is not limited, for example, it can be prefabricated by coating. In one example, the positive electrode material layer formed as a positive electrode sheet is prepared by mixing sulfur, conductive carbon black, and a binder to form a slurry, coating it on the surface of the current collector or conductive film, and then drying and rolling. And cutting to get the electrode sheet. In another example, the positive electrode material layer formed into the positive electrode sheet is prepared by the following method: heat-treating the mixture of sulfur and conductive material, then mixing it with conductive carbon black and a binder to form a slurry, and coating it on the current collector or The surface of the conductive film is dried, rolled and cut to obtain an electrode sheet. In another example, the preparation method of the unsupported positive electrode film includes the following steps: ultrasonically di...

Embodiment 1

[0052] 1. Mix the conductive agent Ketjen black with sublimated sulfur and binder styrene-butadiene rubber carboxyl & methyl cellulose in solvent water through ball milling. In the slurry, the quality of conductive agent Ketjen black, sublimated sulfur and binder The ratio is 40:50:10, the anode of lithium-sulfur battery is prepared by drying after coating on aluminum foil;

[0053] 2. Dissolve acetylene black and polyacrylonitrile in a nitrogen, nitrogen-dimethylformamide solution at a mass ratio of 1:1, and stir well to obtain a precursor solution;

[0054] 3. Transfer the precursor solution to the syringe of the electrospinning instrument, the DC voltage is 15KV, the working distance is 15cm, the pre-prepared lithium-sulfur battery cathode is used to collect the nanofibers, and after drying, they are rolled to obtain a nanofiber protective layer structure Lithium-sulfur battery positive electrode. Use this electrode as the positive electrode and metal lithium as the counter ele...

Embodiment 2

[0058] 1. The conductive agent Ketjen black, sublimed sulfur and binder polyvinylidene fluoride are uniformly mixed by ball milling in the solvent N-methylpyrrolidone to make a slurry. In the slurry, the conductive agent Ketjen black, sublimated sulfur and viscose The mass ratio of the binder is 40:50:10, the aluminum foil is coated and then dried, and after the solvent is volatilized, vacuum drying is performed to prepare the pre-prepared lithium-sulfur battery positive electrode;

[0059] 2. Select conductive graphite material, prepare a porous conductive layer on the surface of the lithium-sulfur battery positive electrode prepared by a nano-printer, and roll it after drying to obtain a lithium-sulfur battery positive electrode protected by an elastic layer structure. The thickness of the protective layer is about 5.2 μm. The scanning electron microscope photo of the cross section of the positive electrode of the lithium-sulfur battery is as Image 6 Shown. The CR2025 button ...

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Abstract

The invention relates to a positive electrode of a lithium-sulfur battery with a multifunctional elastic protection layer. The positive electrode of the lithium-sulfur battery comprises a positive material layer and the multifunctional elastic protection layer, wherein the multifunctional elastic protection layer is formed on the surface of the positive material layer and comprises a polymer and/or a conductive carbon material; and the thickness of the multifunctional elastic protection layer is 0.1-50 microns. The multifunctional elastic protection layer is introduced to the surface of the positive material layer of the lithium-sulfur battery; the multifunctional elastic protection layer has elasticity and conductivity; and has no influence on charge and discharge processes of the positive electrode of the lithium-sulfur battery; compared with the positive electrode of the lithium-sulfur battery without protection from a multifunctional elastic layer structure, the prepared positive electrode of the lithium-sulfur battery with the protection of the multifunctional elastic layer structure has good stability; a structural damage to the positive electrode caused by the volume effect in a charge-discharge cycle process of the battery can be relieved; and meanwhile, the added multifunctional elastic layer structure can ensure that an active material in the positive electrode is not greatly dissolved into an electrolyte to cause the capacity loss.

Description

Technical field [0001] The invention relates to a lithium-sulfur battery positive electrode with a multifunctional elastic protective layer and a preparation method thereof, and belongs to the technical field of lithium-sulfur batteries. Background technique [0002] Since Sony released the first commercial lithium-ion battery in 1992, lithium-ion secondary batteries have been widely used in portable mobile devices due to their high open circuit voltage, high energy density, long cycle life, and no memory effect. Power vehicles and pure electric vehicles have developed rapidly. Significant breakthroughs have been made in the research and development of anode materials for lithium-ion batteries in recent years. The specific capacities of new silicon-based and tin-based materials have been greatly improved compared with carbon-based materials, reaching 2000 and 990mAhg, respectively. -1 . However, the development of cathode materials for lithium-ion batteries is relatively slow, w...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62
CPCY02E60/10
Inventor 温兆银王清松杨建华靳俊马国强郭静
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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