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Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery

A lithium-sulfur battery and electrolyte technology, applied in the field of lithium-sulfur battery electrolyte, can solve the problem that the electrolyte cannot meet the different needs of polysulfides at the same time, achieve good cycle life and coulombic efficiency, prolong cycle life, and ensure specific energy advantage effect

Pending Publication Date: 2022-05-06
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The application provides a lithium-sulfur battery electrolyte, its preparation method and a lithium-sulfur battery, aiming to solve the problem that the electrolyte of a lithium-sulfur battery cannot meet the different requirements of the positive and negative electrodes for polysulfides at the same time

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  • Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte, preparation method thereof and lithium-sulfur battery

Examples

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preparation example Construction

[0074] Preparation method of lithium-sulfur battery electrolyte

[0075] On the other hand, the present application also proposes a method for preparing an electrolyte solution for lithium-sulfur batteries, which may include the following steps: adding lithium salt and additives to the solvent of the dissolution layer under stirring conditions to obtain a solution; adding the solution to the encapsulation layer Solvent, prepared lithium-sulfur battery electrolyte.

[0076] It is understandable that in order to fully dissolve the lithium salt and additives, it is necessary to add the lithium salt and additives to the solvent of the dissolution layer at room temperature, stir until they are completely dissolved, and finally add them to the solvent of the encapsulation layer, and shake until they are completely miscible. Obtain the lithium-sulfur battery electrolyte.

[0077] The preparation method of the lithium-sulfur battery electrolyte according to the embodiment of the presen...

Embodiment 1

[0087] The lithium-sulfur battery electrolyte provided in this example includes the following components: the solvent for the dissolving layer is ethylene glycol dimethyl ether and 1,3-dioxolane, and the solvent for the encapsulation layer is 1,1,2,2-tetrafluoroethyl Base-2,2,3,3-tetrafluoropropyl ether, the volume ratio of the above three substances is 2:2:1; the lithium salt is lithium bis(trifluoromethylsulfonyl)imide, and the concentration is 1.0mol / L; The additive is lithium nitrate, and the mass fraction is 2%.

[0088] Take 35 μL of the above lithium-sulfur battery electrolyte with a loading capacity of 4.2 mg cm -2 The positive electrode sulfur and the negative electrode lithium sheet with a thickness of 50 μm are assembled into a lithium-sulfur battery in an argon atmosphere. The constant current charge and discharge test was carried out on the full battery, pre-cycle 2 laps at 0.05C, and then cycle at 0.1C. When the specific capacity decays to 70% of the initial s...

Embodiment 2

[0090] The lithium-sulfur battery electrolyte provided in this embodiment includes the following components: the solvent for the dissolving layer is ethylene glycol dimethyl ether and 1,3-dioxolane, and the solvent for the encapsulating layer is bis(2,2,2-trifluoroethyl base) ether, the volume ratio of the above three substances is 2:2:1; the lithium salt is lithium bis(trifluoromethylsulfonyl)imide, and the concentration is 1.0mol / L; the additive is lithium nitrate, and the mass fraction is 2 %.

[0091] Take 35 μL of the above lithium-sulfur battery electrolyte with a loading capacity of 4.2 mg cm -2 The positive electrode sulfur and the negative electrode lithium sheet with a thickness of 50 μm are assembled into a lithium-sulfur battery in an argon atmosphere. The constant current charge and discharge test was carried out on the full battery, pre-cycle 2 laps at 0.05C, and then cycle at 0.1C. When the specific capacity decays to 70% of the initial specific capacity at 0....

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Abstract

The invention discloses a lithium-sulfur battery electrolyte, a preparation method thereof and a lithium-sulfur battery. The lithium-sulfur battery electrolyte comprises an organic solvent, a lithium salt and an additive, the organic solvent comprises a dissolution layer solvent and an encapsulation layer solvent, and the volume of the encapsulation layer solvent accounts for 10-40% of the total volume of the organic solvent; the dissolving layer solvent comprises one or more of an ether compound, an amide compound, a sulfone compound and a nitrile compound and is used for dissolving polysulfide generated on the positive electrode side of the lithium-sulfur battery; the encapsulation layer solvent comprises fluoro-ether and is used for reducing the solubility of polysulfide in the lithium-sulfur battery electrolyte. The dissolving layer solvent and the packaging layer solvent are added, so that the lithium-sulfur battery electrolyte can meet the requirements of promoting positive electrode conversion kinetics and protecting a negative electrode at the same time, and the cycle life and coulombic efficiency of the lithium-sulfur battery are improved.

Description

technical field [0001] The application belongs to the field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery electrolyte, a preparation method thereof and a lithium-sulfur battery. Background technique [0002] In recent years, as an important energy storage and conversion device, the energy density of lithium-ion batteries is gradually approaching the theoretical value, so the development of next-generation secondary battery systems with high specific energy and long cycle is of great significance for changing the energy structure. Among them, lithium-sulfur batteries have become the next generation of secondary batteries with broad application prospects due to their wide source of electrode materials, green environmental protection, low cost, and high theoretical energy density (2600Wh / kg). [0003] However, the practical application of lithium-sulfur batteries has been restricted by problems such as short cycle life and low coulombic effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569H01M10/052
CPCH01M10/0566H01M10/052H01M10/0569H01M2300/0028
Inventor 张强侯立鹏张学强
Owner TSINGHUA UNIV
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