Electrolyte for lithium-sulfur batteries containing ether-based solvents and lithium-sulfur batteries comprising the same

Lithium-sulfur electrolyte preventing phase separation with an optimal volume ratio of diethyl ether and DME

This technology utilizes a mixed solvent of diethyl ether (DEE) and dimethoxyethane (DME) at an optimal volume ratio (1:1.2 to 1:3) to prevent phase separation in lithium-sulfur batteries, thereby suppressing lithium dendrite growth and enhancing the conversion kinetics of lithium polysulfide (LiPS).

Conventional lithium-sulfur batteries have suffered from reduced cycle stability due to the shuttle effect caused by lithium polysulfide (LiPS) dissolution during charge/discharge cycles, as well as dendrite formation and side reactions on the lithium anode surface.

By using an organic solvent mixture of DEE and DME in a volume ratio of 1:1.2 to 1:3 as an electrolyte, this technology forms a stable solid electrolyte interphase (SEI) and promotes rapid LiPS conversion without the need for high-concentration lithium salts or additional diluents. This improves battery performance and cycle stability, making it highly useful for increasing the efficiency of secondary battery electrolyte manufacturing processes.

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Key Features:

• Electrolyte containing two or more organic mixed solvents and a lithium salt, including diethyl ether and dimethoxyethane
• Organic mixed solvent with a volume ratio of diethyl ether to dimethoxyethane ranging from 1:1.2 to 1:3
• Configuration that suppresses lithium dendrite growth by applying an optimal volume ratio that prevents phase separation
• Electrolyte that secures the stability and performance of lithium-sulfur batteries by combining lithium salt and mixed solvents

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