This non-aqueous electrolyte secondary battery comprises: an electrode assembly including a positive electrode, a negative electrode, and a separator; and a non-aqueous electrolyte including a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous electrolyte contains a fluorine-containing chain carboxylic acid ester represented by formula 1 and a trifluoroethanol. The fluorine-containing chain carboxylic acid ester is contained in an amount of at least 10 vol% with respect to the volume of the non-aqueous electrolyte excluding the electrolyte salt, and the trifluoroethanol is contained in an amount of 0.1-2 mass% with respect to the mass of the fluorine-containing chain carboxylic acid ester. [Formula 1] RCOOCH2CF3, wherein R is a C2 or lower alkyl group, or a fluoroalkyl group.
Titles:
ELECTROLYTE FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
리튬 이차 전지용 전해질 및 이를 포함하는 리튬 이차 전지
Abstracts:
The present invention relates to electrolyte for a lithium secondary battery, and a lithium secondary battery comprising same, the electrolyte comprising lithium salt, a first additive, a second additive, and an organic solvent, wherein the first additive comprises a compound expressed by chemical formula 1 and the second additive comprises a compound expressed by chemical formula 2.
본 발명은 리튬염, 제1첨가제, 제2첨가제 및 유기용매를 포함하고, 상기 제1첨가제는 화학식 1로 표시되는 화합물을 포함하며, 상기 제2첨가제는 화학식 2로 표시되는 화합물을 포함하는 리튬 이차 전지용 전해질 및 이를 포함하는 리튬 이차 전지에 관한 것이다.
Applicant:
LG CHEMICAL LTD [KR] (주식회사 엘지화학)
Inventors:
KIM HYUN SEUNG [KR] (김현승)
AN YU HA [KR] (안유하)
LEE CHUL HAENG [KR] (이철행)
OH JEONG WOO [KR] (오정우)
Other family members:
KR 20200105227 A,
Pub. Date: 2020-09-07,
EPO/ Google
Titles:
Non-aqueous electrolyte solution and energy device using it
非水系電解液及びそれを用いたエネルギーデバイス
Abstracts:
PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte solution having good initial performance and durability performance of an energy device typified by a non-aqueous electrolyte secondary battery, particularly initial capacity, initial battery swelling, capacity retention rate after high temperature storage, and high temperature storage swelling. I will provide a. SOLUTION: The non-aqueous electrolyte solution contains an electrolyte, a non-aqueous solvent and LiHSO4, and the content of the LiHSO4 with respect to the entire non-aqueous electrolyte solution is 0.1% by mass or less. Cyclic carbonate with fluorine atom, cyclic carbonate with carbon-carbon unsaturated bond, difluorophosphate, salt with FSO2 structure, compound with isocyanato group, compound with cyano group, cyclic sulfonic acid ester and dicarboxylic acid complex salt It is preferable to contain at least one specific compound selected from the group consisting of. [Selection diagram] None
