Lithium-sulfur battery with composite structure

A lithium-sulfur battery and composite technology, applied in the direction of lithium batteries, structural parts, battery pack components, etc., can solve the problems of limiting the full discharge of the battery, affecting the discharge capacity of the battery, and failing to meet actual needs

Active Publication Date: 2016-03-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, lithium-sulfur batteries have made great progress, but there are still some limitations that need to be further improved
1) The dissolution of the discharge product polysulfide and the shuttle between the positive and negative electrodes make the lithium-sulfur battery cycle stability poor, far from meeting people's actual needs
2) The insulation of sulfur and lithium sulfide itself limits the full discharge of the battery and affects the discharge capacity of the battery
But this battery result does not take full advantage of the properties of metal sulfides to improve the cycle stability of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1 mass fraction of TiS 2 Disperse evenly in 10 parts by mass of ethanol, and TiS 2 Spray the dispersion liquid on the polypropylene diaphragm, dry and remove water for later use.

[0020] The negative electrode of a lithium-sulfur battery is a lithium foil with a thickness of 20 microns. The positive electrode is prepared by the following method: 20 parts by mass of SuperP carbon, 70 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) blended in N-methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The electrolyte solution is a solution of lithium bis(trifluoromethylsulfonyl)imide, the solvent is ethylene glycol dimethyl ether / dioxolane (volume ratio 1:1), and the concentration of the electrolyte is 1mol / L. The above components are used as positive electrode / separator (containing TiS 2 coating) / the layered structure of the negative electrode ...

Embodiment 2

[0024] Preparation of composite sulfur barrier layer: 1 mass fraction of MoS 2 1. 1 mass fraction of graphene is uniformly dispersed in 15 mass fractions of isopropanol, and the above dispersion is suction-filtered to form a solid film, and dried for later use.

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

Embodiment 3

[0027] Preparation of composite sulfur barrier layer: 1 mass fraction of WS 2 1. 1 mass fraction of graphene is uniformly dispersed in 15 mass fractions of isopropanol, and the above dispersion is suction-filtered to form a solid film, and dried for later use.

[0028] The negative electrode of a lithium-sulfur battery is a lithium foil with a thickness of 20 microns. The positive electrode is prepared by the following method: 20 parts by mass of SuperP carbon, 70 parts by mass of elemental sulfur, and 10 parts by mass of polyvinylidene fluoride (PVDF) blended in N-methylpyrrolidone (NMP), coated onto aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.0 mg / cm2. The electrolyte solution is a solution of lithium bis(trifluoromethylsulfonyl)imide, the solvent is ethylene glycol dimethyl ether / dioxolane (volume ratio 1:1), and the concentration of the electrolyte is 1mol / L. The above-mentioned components were assembled together in a laye...

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Abstract

The invention discloses a lithium-sulfur battery with a composite structure. The lithium-sulfur battery comprises a negative electrode, a diaphragm and a positive electrode which are stacked in sequence, wherein a composite sulfur-blocking layer is arranged between the diaphragm and the positive electrode. The composite sulfur-blocking layer can effectively block the migration of lithium polysulfide, so that lithium polysulfide is prevented from being in direct contact with the negative electrode to generate a reaction, and the cyclic stability and coulombic efficiency of the battery are improved; and the composite sulfur-blocking layer can release the capacity, so that the battery capacity can be integrally expanded.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries. Background technique [0002] The strong demand for large-scale energy storage and the progress of electric vehicles have greatly promoted the development of large-scale lithium-ion secondary batteries, but even the highest theoretical energy density of lithium-ion batteries cannot meet the requirements of the above applications. Lithium-sulfur secondary batteries, as the next generation of lithium batteries, have a very high theoretical specific energy density (2600Wh.kg -1 ) and cheap, environmentally friendly. Therefore, it has a good application prospect. [0003] At present, lithium-sulfur batteries have made great progress, but there are still some limitations that need to be further improved. 1) The dissolution of the discharge product polysulfide and the shuttle between the positive and negative electrodes make the cycle stability of the lithium-sulfur battery poor, which is far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M2/16H01M50/449H01M50/46
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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