Electrolyte additive and non-aqueous electrolyte solution for lithium secondary battery comprising the same
AssigneeLG Chem, Ltd.
InventorsYoung Min Lim, Chul Haeng Lee, Kyung Mi Lee
Life of this patent
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Abstract
The present invention relates to a non-aqueous electrolyte solution additive, and a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery which comprise the same, wherein, specifically, since the non-aqueous electrolyte solution, which comprises a compound capable of maintaining a passive effect by increasing an effect of forming a solid electrolyte interface (SEI) on surfaces of a positive electrode and a negative electrode, is provided, high-temperature storage characteristics and life characteristics of the lithium secondary battery may be improved.
Claims20
An electrolyte additive comprising a compound represented by Formula 1:
- wherein, in Formula 1,
- X1 and X2 are phosphorus (P),
- Y1 to Y4 are each independently oxygen (O) or sulfur (S),
- L is a direct bond or a divalent hydrocarbon group having 1 to 10 carbon atoms, and
- R1 to R4 are each independently hydrogen, a halogen atom, a nitrile group, or a monovalent hydrocarbon group having 1 to 20 carbon atoms, and at least one of R1 to R4 is a halogen atom,
- wherein the divalent hydrocarbon group having 1 to 10 carbon atoms and the monovalent hydrocarbon group having 1 to 20 carbon atoms are substituted or unsubstituted, and the substitution is performed with at least one substituent selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms.
Dependencies are inferred from the claim text.