Electrolyte for lithium secondary battery and lithium secondary battery including the same
First Claim
1. An electrolyte for a lithium secondary battery, comprising:
- a cyclic ester;
an organic solvent comprising a nitrile-containing solvent represented by the following Formula 1 at a content ranging from 1 to 5% by volume based on the total volume of the cyclic ester and the nitrile-containing solvent;
R—
C≡
N
(1)wherein R is selected from the group consisting of a C1 to C10 aliphatic hydrocarbon, a C1 to C10 halogenated aliphatic hydrocarbon, a C6 to C10 aromatic hydrocarbon, and a C6 to C10 halogenated aromatic hydrocarbon; and
a lithium salt.
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Abstract
An electrolyte for a lithium secondary battery, and a lithium secondary battery including the same are provided. The electrolyte includes: a cyclic ester; an organic solvent including a nitrile-containing solvent represented by Formula 1 at a content ranging from 1 to 5% by volume; and a lithium salt,
R—C≡N (1)
wherein R is selected from the group consisting of a C1 to C10 aliphatic hydrocarbon, a C1 to C10 halogenated aliphatic hydrocarbon, a C6 to C10 aromatic hydrocarbon, and a C6 to C10 halogenated aromatic hydrocarbon. The electrolyte can improve swelling characteristics and discharge capacity characteristics at a low temperature, and realize equal or better performance in characteristics such as capacity, life span and the like, as compared to a conventional carbonate-containing electrolyte.
7 Citations
26 Claims
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1. An electrolyte for a lithium secondary battery, comprising:
-
a cyclic ester; an organic solvent comprising a nitrile-containing solvent represented by the following Formula 1 at a content ranging from 1 to 5% by volume based on the total volume of the cyclic ester and the nitrile-containing solvent;
R—
C≡
N
(1)wherein R is selected from the group consisting of a C1 to C10 aliphatic hydrocarbon, a C1 to C10 halogenated aliphatic hydrocarbon, a C6 to C10 aromatic hydrocarbon, and a C6 to C10 halogenated aromatic hydrocarbon; and
a lithium salt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A lithium secondary battery, comprising:
-
a positive electrode containing a positive electrode active material which can intercalate and deintercalate lithium; a negative electrode containing a negative electrode active material which can intercalate and deintercalate lithium; and an electrolyte comprising a cyclic ester, an organic solvent containing a nitrile-containing solvent represented by the following Formula 1 at a content ranging from 1 to 5% by volume based on the total volume of the cyclic ester and the nitrile-containing solvent, and a lithium salt;
R—
C≡
N
(1)wherein R is selected from the group consisting of a C1 to C10 aliphatic hydrocarbon, a C1 to C10 halogenated aliphatic hydrocarbon, a C6 to C10 aromatic hydrocarbon, and a C6 to C10 halogenated aromatic hydrocarbon. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification