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An electrolyte and a lithium-sulfur battery comprising the same

A lithium-sulfur battery and electrolyte technology, which is applied in the field of lithium-sulfur batteries, can solve the problem that the activation voltage of lithium sulfide is not helpful, and achieve the effects of broad industrialization prospects, lower activation voltage, and low price

Active Publication Date: 2021-03-12
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium-sulfur electrolytes are widely used in conventional lithium-sulfur batteries, they do not contribute to the activation voltage of lithium sulfide cathodes.

Method used

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  • An electrolyte and a lithium-sulfur battery comprising the same
  • An electrolyte and a lithium-sulfur battery comprising the same
  • An electrolyte and a lithium-sulfur battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Electrolyte configuration

[0031] The configuration process of the electrolyte is completed in the glove box, the water oxygen content in the glove box is less than 0.01ppm, and the temperature is at room temperature. Lithium bistrifluoromethanesulfonylimide (LiTFSI) and lithium nitrate were fully dried in a glove box, and molecular sieves were placed in absolute ethanol and allowed to stand for 12 hours.

[0032] Dissolve lithium bistrifluoromethanesulfonylimide (LiTFSI) in a mixed solvent of 20.48 g of 1,3-dioxolane and 16.67 g of 1,2-ethylene glycol dimethyl ether, so that bistrifluoromethanesulfonylimide The final concentration of lithium amide (LiTFSI) was 1M, and it was left to stand for 24 hours for later use. Take 10 grams of the prepared above-mentioned solution, add 0.2 grams of lithium nitrate to it, let it stand for 12 hours, add 0.01 grams of ethanol dropwise and shake to obtain the required electrolyte.

[0033] 2) Battery assembly and testing

[00...

Embodiment 2

[0039] 1) Electrolyte configuration

[0040] The electrolytic solution was configured in the same manner as in Example 1 except that the amount of ethanol was replaced by 0.005 g.

[0041] 2) Battery assembly and testing

[0042] A battery was assembled and tested in the same manner as in Example 1, except that the electrolyte solution prepared in Example 2 was used.

Embodiment 3

[0044] 1) Electrolyte configuration

[0045] The electrolyte solution was configured in the same manner as in Example 1, except that the amount of ethanol was replaced by 0.0025 g.

[0046] 2) Battery assembly and testing

[0047] A battery was assembled and tested in the same manner as in Example 1, except that the electrolyte solution prepared in Example 3 was used.

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Abstract

The invention provides an electrolyte for a lithium-sulfur battery. The electrolyte comprises an organic lithium salt solution with the concentration of 0.5-2 M, and 0-5 parts by mass of an inorganiclithium salt and 0.005-3 parts by mass of an additive capable of dissolving lithium sulfide relative to 100 parts by mass of the organic lithium salt solution, wherein the solvent in the organic lithium salt solution is selected from one or a mixture of two or more of an ether solvent and an ester solvent. By virtue of the electrolyte, the activation voltage can be effectively lowered.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same. The electrolyte can significantly reduce the activation voltage of a positive electrode of lithium sulfide. Background technique [0002] With the rapid development of society and the transformation of energy structure, the demand for energy storage technology is becoming more and more urgent. Lithium-ion batteries (LIBs), as the most widely used commercial secondary energy storage batteries, cannot fully meet the needs of rapidly developing electric vehicles, large-scale energy storage devices, and advanced portable electronic devices due to the limitation of the energy density of the positive electrode. Lithium-sulfur batteries have relatively high energy density and are considered to be one of the most competitive next-generation battery systems. The theoretical specific...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/4235Y02E60/10
Inventor 梁鑫恽聚峰石鹏程项宏发
Owner HEFEI UNIV OF TECH
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