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Composite film for lithium-sulfur battery

A technology of lithium-sulfur batteries and composite membranes, which is applied to battery components, circuits, electrical components, etc., and can solve the problems of lithium nitrate consumption

Inactive Publication Date: 2016-04-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Zhang et al. reported that under low voltage, nitrate would undergo an irreversible reaction at the positive electrode and consume lithium nitrate.

Method used

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  • Composite film for lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of composite membrane rich in nitrate ions: polyvinylidene fluoride (PVDF) and lithium nitrate are mixed and dissolved in N-methylpyrrolidone (NMP) according to the mass ratio of 1:1 to form a film-forming solution with a concentration of 10%. . The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0021] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 20 microns, and the positive electrode is prepared by the following method: 20 parts by mass of SuperP carbon, 70 parts by mass of elemental sulfur, and polyvinylidene fluoride (PVDF) of 10 parts by mass in N - Blend in methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The electrolyte of the lithium-sulfur battery is dioxolane / ethylene glycol dimethyl ether (volume ratio 1:1) of 1 mol / L lithium trifluorometh...

Embodiment 2

[0024] Preparation of composite membrane rich in nitrate ions: polyvinylidene fluoride (PVDF) and cesium nitrate are mixed and dissolved in N-methylpyrrolidone (NMP) according to the mass ratio of 1:2, and a film-forming solution with a concentration of 15% is prepared . The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0025] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 20 microns, and the positive electrode is prepared by the following method: 20 parts by mass of SuperP carbon, 70 parts by mass of elemental sulfur, and polyvinylidene fluoride (PVDF) of 10 parts by mass in N - Blend in methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The electrolyte of the lithium-sulfur battery is dioxolane / ethylene glycol dimethyl ether (volume ratio 1:1) of 1 mol / L lithium triflu...

Embodiment 3

[0028] Preparation of composite membrane rich in nitrate ions: polysulfone (PSF) and lithium nitrate are mixed and dissolved in N,N-dimethylformamide (DMF) according to the mass ratio of 1:1, and the concentration is 20% membrane solution. The film-forming solution is cast to form a film. Naturally dry at 70°C, vacuum dry at 70°C to remove water and set aside.

[0029] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 20 microns, and the positive electrode is prepared by the following method: 20 parts by mass of SuperP carbon, 70 parts by mass of elemental sulfur, and polyvinylidene fluoride (PVDF) of 10 parts by mass in N - Blend in methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The electrolyte of the lithium-sulfur battery is dioxolane / ethylene glycol dimethyl ether (volume ratio 1:1) of 1 mol / L lithium trifluoromethanesulfonamide.

[0030]...

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Abstract

A composite film for a lithium-sulfur battery is composed of: one or more than two polymers having film-forming property, and one or more than two salts containing nitrate. The mass percentage of the salts containing nitrate in the composite film is 0.1-90%. Because the film is rich in nitrate, better utilization on the nitrate in the composite film can be achieved and further quick uncontrollable consumption of the nitrate is avoided, thereby delaying consumption of the nitrate and further increasing capacity retention ratio of the battery.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, specifically, the related lithium-sulfur batteries include negative electrode metal lithium, positive electrodes containing sulfur elements, separators and electrolyte solutions. Background technique [0002] Lithium-sulfur batteries, because of their very high theoretical specific energy density (2600Wh.kg-1) and low price, have become a research hotspot for the next generation of lithium batteries. Especially in the last ten years, with the development of cathode materials using mature nanotechnology, the process of practical lithium-sulfur batteries has been greatly promoted. [0003] But lithium-sulfur batteries have some inherent drawbacks. For example, the dissolution of discharge product polysulfides and shuttling between the positive and negative electrodes, and the irreversible deposition of lithium sulfide / lithium disulfide on the positive and negative electrodes are all obstacl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/446
CPCY02E60/10
Inventor 曲超张华民张洪章王美日王倩马艺文
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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