ELECTROLYTE FOR LITHIUM-SULFUR SECONDARY BATTERY AND LITHIUM-SULFUR SECONDARY BATTERY COMPRISING SAME

The present invention relates to an electrolyte for a lithium-sulfur secondary battery capable of lowering resistance and improving output characteristics of the lithium-sulfur secondary battery, and to a lithium-sulfur secondary battery comprising same. The electrolyte for a lithium-sulfur secondar...

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Bibliographic Details
Main Authors LEE, Suyeong, LEE, Boram, YOO, Solji, JEON, Hyelim, CHA, Sunyoung
Format Patent
LanguageEnglish
French
Korean
Published 02.05.2024
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Summary:The present invention relates to an electrolyte for a lithium-sulfur secondary battery capable of lowering resistance and improving output characteristics of the lithium-sulfur secondary battery, and to a lithium-sulfur secondary battery comprising same. The electrolyte for a lithium-sulfur secondary battery comprises a lithium salt, a non-aqueous solvent, and an additive, and a first mixing energy (Gmix1) of the electrolyte and dilithio pertetrasulfide (Li2S4), a second mixing energy (Gmix2) of the electrolyte and dilithio perhexasulfide (Li2S6), and a third mixing energy (Gmix3) of the electrolyte and dilithio peroctasulfide (Li2S8) satisfy a predetermined relationship. La présente invention concerne un électrolyte pour une batterie secondaire au lithium-soufre capable d'abaisser la résistance et d'améliorer les caractéristiques de sortie de la batterie secondaire au lithium-soufre, et une batterie secondaire au lithium-soufre le comprenant. L'électrolyte pour une batterie secondaire au lithium-soufre comprend un sel de lithium, un solvant non aqueux et un additif, et une première énergie de mélange (Gmix1) de l'électrolyte et du dilithio pertétrasulfure (Li2S4), une deuxième énergie de mélange (Gmix2) de l'électrolyte et du dilithio perhexasulfure (Li2S6), et une troisième énergie de mélange (Gmix3) de l'électrolyte et du dilithio peroctasulfure (Li2S8) satisfont une relation prédéterminée. 본 발명은 리튬-황 이차전지의 저항을 낮추고 출력 특성을 향상시킬 수 있는 리튬-황 이차전지용 전해질 및 이를 포함하는 리튬-황 이차전지에 관한 것이다. 상기 리튬-황 이차전지용 전해질은 리튬염, 비수계 용매 및 첨가제를 포함하고, 전해질과, 디리티오 퍼테트라설파이드 (dilithio pertetrasulfide; Li2S4)의 제 1 혼합 에너지(Gmix1), 전해질과, 디리티오 퍼헥사설파이드 (dilithio perhexasulfide; Li2S6)의 제 2 혼합 에너지(Gmix2), 및 전해질과, 디리티오 퍼옥타설파이드 (dilithio peroctasulfide; Li2S8) 의 제 3 혼합 에너지(Gmix3)가 소정의 관계를 충족하는 것이다.
Bibliography:Application Number: WO2023KR15743