2 2 Organic electrolytic solution of lithium secondary battery method for manufacturing the same and lithium secondary battery having the same

PURPOSE: An organic electrolyte solution for a lithium secondary battery, its preparation method and a lithium secondary battery employing the organic electrolyte solution are provided, to suppress the swelling of a battery by reducing the generation of gas inside a battery. CONSTITUTION: The organi...

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Bibliographische Detailangaben
1. Verfasser:	LEE, GYEONG YEOL
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRICITY PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
Online-Zugang:	Volltext bestellen
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Zusammenfassung:	PURPOSE: An organic electrolyte solution for a lithium secondary battery, its preparation method and a lithium secondary battery employing the organic electrolyte solution are provided, to suppress the swelling of a battery by reducing the generation of gas inside a battery. CONSTITUTION: The organic electrolyte solution comprises an organic solvent where a lithium salt is dissolved; and 0.5-5 wt% of vinyl acetate. Preferably the organic solvent is at least one selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate, methylpropyl carbonate and ethylpropyl carbonate; and the lithium salt is at least one selected from the group consisting of LiPF6, LiSbF6, LiN(CF3SO2)2, LiN(C2F5SO2), LiC(CF3SO2) and LiBF4 and the concentration is 0.5-2.0 M. 전지의 부풀림 현상을 억제하는 유기 전해액이 개시되어 있다. 상기 전해액은 리튬염이 용해된 유기 용매에 비닐아세테이트를 첨가하여 제조된다. 비닐아세테이트는 음극으로 사용된 흑연과 반응하여 피막을 형성하고, 상기 피막은 전해액의 분해반응을 차단한다. 따라서, 전지 내부의 가스 발생량이 감소되고, 전지의 부풀림 현상이 억제된다. 또한, 양극 활물질에 세륨-지르코니아를 첨가함으로서 전지 내부의 HF 발생량을 감소시키고, 전해액과 음극과의 반응에 의해 생성되는 CO, CO 등의 가스 발생을 억제할 수 있다. 따라서, 전지의 박형화에 대한 신뢰성 및 전지 성능이 향상된다.