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Lithium-sulfur battery electrolyte

A lithium-sulfur battery and electrolyte technology, applied in the field of lithium-sulfur battery electrolyte, can solve the problems of unfavorable commercialization of batteries and increased battery prices

Inactive Publication Date: 2017-06-20
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

Although the discharge platform of the battery is better than that of the commonly used DME / DOL type electrolyte, the capacity stability of the battery is better than the latter
However, the article adds a large amount of LiTFSI lithium salt in the electrolyte, which will greatly increase the price of the battery, which is not good for the commercialization of the battery

Method used

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  • Lithium-sulfur battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Electrolyte solution composition: straight-chain fatty ether is straight-chain fatty ether (1) (as shown in formula 1); lithium salt is LiN(SO3CF2CF3)2, concentration is 1mol / L;

[0035] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 50 microns, and the positive electrode is prepared by the following method: 30 parts by mass of Super P carbon, 60 parts by mass of elemental sulfur, and 10 parts by mass (solid content) of nitrile rubber emulsion Blend and apply to aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.5 mg / cm2. The above-mentioned components were assembled together in a layered structure of positive electrode / diaphragm / negative electrode, and sealed after adding electrolyte at a rate of 30 microliters per square centimeter of positive electrode area. After standing still for 5 hours, the battery was charged and discharged at 0.1C and 1C, respectively, with respect to the mas...

Embodiment 2

[0037] The composition of the electrolyte solution: the straight-chain fatty ether is straight-chain fatty ether (2) (as shown in formula 1); the lithium salt is LiN(SO3CF2CF3)2, and the concentration is 1mol / L;

[0038] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 50 microns, and the positive electrode is prepared by the following method: 30 parts by mass of Super P carbon, 60 parts by mass of elemental sulfur, and 10 parts by mass (solid content) of nitrile rubber emulsion Blend and apply to aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.5 mg / cm2. The above-mentioned components were assembled together in a layered structure of positive electrode / diaphragm / negative electrode, and sealed after adding electrolyte at a rate of 30 microliters per square centimeter of positive electrode area. After standing still for 5 hours, the battery was charged and discharged at 0.1C and 1C, respective...

Embodiment 3

[0040] The composition of the electrolyte solution: the straight-chain fatty ether is straight-chain fatty ether (3) (as shown in formula 1); the lithium salt is LiN(SO3CF2CF3)2, and the concentration is 1mol / L;

[0041] The negative electrode of the lithium-sulfur battery is a lithium foil with a thickness of 50 microns, and the positive electrode is prepared by the following method: 30 parts by mass of Super P carbon, 60 parts by mass of elemental sulfur, and 10 parts by mass (solid content) of nitrile rubber emulsion Blend and apply to aluminum foil. The sulfur content in the positive electrode active layer after drying was 1.5 mg / cm2. The above-mentioned components were assembled together in a layered structure of positive electrode / diaphragm / negative electrode, and sealed after adding electrolyte at a rate of 30 microliters per square centimeter of positive electrode area. After standing still for 5 hours, the battery was charged and discharged at 0.1C and 1C, respective...

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Abstract

The invention relates to lithium-sulfur battery electrolyte. The electrolyte is composed of one or more than two straight chain aliphatic ethers and one or more than two lithium salts. The electrolyte solution has the advantages of excellent sulfur resistance, good cycling stability and low cost.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to an electrolyte solution for lithium-sulfur batteries. Background technique [0002] In recent decades, the commercialization of lithium-ion batteries has greatly promoted the wide application of electronic devices such as mobile phones and notebooks in daily life. However, the energy density of lithium-ion batteries is generally not high, which also limits their applications in electric vehicles and large-scale energy storage. Therefore, people are developing batteries with higher specific capacity, such as lithium-air and lithium-sulfur batteries. Among them, lithium-sulfur batteries are closer to commercialization. [0003] The theoretical specific energy density of sulfur is 2500Whkg -1 , 2800WhL -1 . Moreover, sulfur is cheap, resource-rich, and environmentally friendly, because lithium-sulfur batteries are expected to become the next generation of commercial batt...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/052
CPCH01M10/052H01M10/0569H01M2300/0028Y02E60/10
Inventor 曲超张华民张洪章李先锋王美日
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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