Titles:
NON-AQUEOUS ELECTROLYTE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING SAME
리튬 이차전지용 비수전해액 및 이를 포함하는 리튬 이차전지
Abstracts:
The present invention relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising same. Specifically, the present invention relates to: a non-aqueous electrolyte for a lithium secondary battery, comprising a lithium salt, an organic solvent, and a compound serving as a first additive and represented by chemical formula 1; and a lithium secondary battery which has improved high-temperature storage characteristics by comprising the non-aqueous electrolyte.
본 발명은 리튬 이차전지용 비수전해액 및 이를 포함하는 리튬 이차전지에 관한 것으로, 구체적으로 리튬염, 유기용매 및 제1 첨가제로 화학식 1로 표시되는 화합물을 포함하는 리튬 이차전지용 비수전해액과 이를 포함함으로써, 고온 저장 특성이 향상된 리튬 이차전지에 관한 것이다.
Applicant:
LG CHEMICAL LTD [KR] (주식회사 엘지화학)
Inventors:
AN YU HA [KR] (안유하)
KIM HYUN SEUNG [KR] (김현승)
LEE CHUL HAENG [KR] (이철행)
OH JEONG WOO [KR] (오정우)
Other family members:
KR 20210031158 A,
Pub. Date: 2021-03-19,
EPO/ Google
Titles:
Electrolyte for high-voltage lithium ion battery and lithium ion battery containing the electrolyte
高电压锂离子电池用电解液及含该电解液的锂离子电池
Abstracts:
The invention belongs to the field of batteries, and discloses an electrolyte for a high-voltage lithium ion battery and a lithium ion battery containing the electrolyte. The electrolyte for high-voltage lithium ion batteries of the present invention contains lithium salt, organic solvent, sulfur-containing lithium salt derivative additives, fluoroether additives and conventional additives, wherein the conventional additives are selected from fluoroethylene carbonate, 1 , 3 propane sultone, vinyl ethylene carbonate, vinylene carbonate, propylene carbonate, one or more of lithium difluorophosphate. The high-voltage lithium ion battery electrolyte is added with sulfur-containing lithium salt derivatives. The addition of sulfur-containing lithium salt derivatives improves the permeability of the SEI membrane to lithium ions, so the impedance is low, the cycle performance and the low temperature performance are good Fluorinated ether additives have higher oxidation potential and lower viscosity. The introduction of fluorine atoms makes the fluorinated ether additives have certain flame retardancy and good high temperature stability.
Titles:
NONAQUEOUS ELECTROLYTE SOLUTION AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
非水系電解液および非水系二次電池
Abstracts:
The present invention provides a nonaqueous electrolyte solution which contains: a nonaqueous solvent containing acetonitrile and vinylene carbonate; and a compound represented by general formula (1) R1-A-R2 (wherein A represents a divalent group that has a structure represented by one of formulae (1-2) to (1-5); and each of R1 and R2 independently represents an aryl group, an alkyl group which may be substituted by a halogen atom, while having from 1 to 4 carbon atoms, an alkyl group, a vinylidene group which may be substituted by a halogen atom, or an aryl group which may be substituted by a halogen atom; or alternatively, R1 and R2 may combine with each other and form, together with A, a ring structure that may have an unsaturated bond). With respect to this nonaqueous electrolyte solution, the total content of the vinylene carbonate and the compound represented by general formula (1) is not less than 0.1% by volume but less than 10% by volume relative to the total amount of the nonaqueous solvent; and the content of the vinylene carbonate is lower than the content of the compound represented by general formula (1).
