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US 2024/0274884 A1Published application
Electrolyte and secondary battery comprising same
AssigneeSoulbrain Co., Ltd.
InventorsMin Goo KIM, Min Jung JANG, Jae Yoon KIM, Sang Ho LEE, Jong Cheol YUN, Ji Seong HAN
Life of this patent
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Abstract
Disclosed is an electrolyte and a secondary battery containing the same. According to the present disclosure, charging efficiency and output may be improved due to low discharge resistance, and gas generation and thickness increase may be suppressed to provide a secondary battery with long-term lifespan and excellent high temperature capacity retention.
Claims18
An electrolyte, which includes an organic solvent, lithium salt, a first additive and a second additive,
- wherein the first additive contains a compound having an atomic group with 3 to 5 atoms represented by Formula 1 or 2 in an amount of 15 weight % or less based on 100 weight % of the electrolyte, the atomic group having 2 to 4 atoms with electronegativity of 3 or more and having at least one double bond,
- wherein the second additive contains a compound having an atomic group with 3 to 5 atoms and a symmetric structure in an amount of 0.01 to 10 weight % based on 100 weight % of the electrolyte, the atomic group having 2 to 4 atoms with electronegativity of 3 or more and having at least one double bond:
- wherein in Formulas 1 and 2, a solid line is a bond.
An electrolyte additive, comprising:
- at least one compound selected from compounds represented by Formulas 3 to 6 below;
- and
- a compound containing a pair of cesium cation and an anion represented by Formula 14 below:
- wherein in Formula 3, R1, R2 and R3 are independently an alkyl group with 1 to 5 carbon atoms or an aryl group with 6 to 10 carbon atoms,
- wherein in Formulas 4 to 5, A is phosphorus (P), sulfur (S), or nitrogen (N);
- X1, X2, X3, X1′, X2′ and X3′ are independently a bond or oxygen;
- n is an integer of 0 to 3;
- and R1, R2, R3, R1′, R2′ and R3′ are independently a bond, substituted or unsubstituted alkylene with 1 to 10 carbon atoms and have at least one carbon,
- wherein in Formula 6, R4 is OR6 or R6;
- R5 is RA;
- A is
- and R6 and R7 are independently an alkyl group with 1 to 5 carbon atoms or an aryl group with 6 to 10 carbon atoms,
- wherein in Formula 14, R1 and R2 are independently hydrogen, halogen, or a straight-chain or branched alkyl group containing a halogen substituent with 1 to 7 carbon atoms, and h is an integer of 1 to 10.
10 more elements
Dependencies are inferred from the claim text.