Electrolyte for lithium secondary battery and lithium secondary battery comprising the same
AssigneeSamsung SDI Co., Ltd.
InventorsNa-Rae PARK, Jin-Bum Kim, Jin-Sung Kim, Jin-Hyunk Lim
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Abstract
An electrolyte for a lithium battery includes a non-aqueous organic solvent; a lithium salt; a first additive, which is 2-sulfobenzoic acid cyclic anhydride, represented by Formula 1 below, and a second additive, which is a carbonate derivative having a substituent selected from the group consisting of halogen, a cyano (CN) group and a nitro (NO2) group. A lithium secondary battery containing the electrolyte is excellent in terms of its battery life and low-temperature discharge capacity characteristics, and t has a reduced expansion at room temperature or at high temperatures.
Claims19
An electrolyte for a lithium ion battery, comprising:
- a non-aqueous organic solvent;
- a lithium salt;
- a first additive, which is 2-sulfobenzoic acid cyclic anhydride, represented by Formula 1 below, and
- a second additive, which is a carbonate derivative having a substituent selected from the group consisting of halogen, a cyano (CN) group and a nitro (NO2) group.
A lithium secondary battery comprising:a positive electrode comprising a positive electrode active material that intercalates and deintercalates lithium ions;
- and
- a negative electrode comprising a negative electrode active material that intercalates and deintercalates lithium ions, and
- and electrolyte comprising:
- a non-aqueous organic solvent,
- a lithium salt,
- a first additive, which is 2-sulfobenzoic acid cyclic anhydride, represented by Formula 1 below, and
- a second additive, which is a carbonate derivative having a substituent selected from the group consisting of halogen, a cyano (CN) group and a nitro (NO2) group.
A method of inhibiting a breakdown of a solid electrolyte interface (SEI) film and a decomposition of a carbonate-based solvent of an electrolyte in a lithium secondary battery, the method comprising:
- including, as additives in the electrolyte, 0.1 to 5 wt % of 2-sulfobenzoic acid cyclic anhydride and 0.1 to 10 wt % of a carbonate derivative having a substituent selected from the group consisting of halogen, a cyano (CN) group and a nitro (NO2) group.
Dependencies are inferred from the claim text.