Non-aqueous electrolyte and a lithium secondary battery comprising the same
AssigneeSamsung SDI Co., Ltd.
InventorsHyeong-Gon Noh, Cheol-Soo Jung, Eui-Hwan Song
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Abstract
An electrolyte of a lithium secondary battery includes lithium salts, an organic solvent with a high boiling point, and a carbonate-based additive compound having substituents selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2). The electrolyte improves discharge, low temperature, and cycle life characteristics of a lithium secondary battery.
Claims58
An electrolyte of a lithium secondary battery comprising:
- lithium salts;
- a first organic solvent;
- and
- a carbonate-based additive compound having substituents selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2),
- wherein the carbonate-based additive compound is added in an amount of 0.01 to 10 wt %.
An electrolyte of a lithium secondary battery comprising lithium salts;
- an organic solvent with a high boiling point;
- a carbonate-based additive compound having substituents selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2), and an organic sulfone-based compound of formula (3):
- wherein R1 and R2 are independently selected from the group consisting of a primary, secondary, or tertiary alkyl group, an alkenyl group, an aryl group, and a cycloalkyl group, or R1 and R2 are bound together to form a cyclic ring, wherein the carbonate-based additive compound is added in an amount of 0.01 to 10 wt %.
A lithium secondary battery comprising:
- a positive electrode including a material that reversibly intercalates/deintercalates lithium ions, or a material that reversibly forms a lithium-containing compound as a positive active material;
- a negative electrode including a lithium metal, a lithium-containing alloy, or a material that reversibly intercalates/deintercalates lithium ions;
- and
- an electrolyte comprising:
- lithium salts;
- an organic solvent with a high boiling point;
- and
- a carbonate-based additive compound having substituents selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2), wherein the carbonate-based additive compound is added in an amount of 0.01 to 10 wt % based on a total amount of the electrolyte.
An electrolyte of a lithium secondary battery comprising:
- a mixed solvent formed by mixing γ-butyrolactone (GBL)/ethylene carbonate (EC)/ethyl methyl carbonate (EMC)/dimethyl carbonate (DMC)/fluorobenzene (FB), LiPF6 to a concentration of 0.6 to 2.0 M, and an ethylene carbonate derivative added in an amount to obtain 0.01 to 10 wt %, based on a total amount of the electrolyte,
- wherein the ethylene carbonate derivative includes electron-withdrawing groups with high electronegativity selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2), the ethylene carbonate derivative being represented by formula (1):
- wherein X is selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2).
An electrolyte of a lithium secondary battery comprising:
- a mixture comprising:
- γ-butyrolactone (GBL);
- lithium salts;
- a carbonate-based additive compound represented by formula (1) wherein X is selected from the group consisting of a halogen, a cyano (CN), and a nitro (NO2):
- wherein the carbonate-based additive compound is added in an amount of 0.01 to 10 wt % based on a total weight of the electrolyte
- an organic sulfone-based compound of formula (3):
- wherein R1 and R2 are independently selected from the group consisting of a primary, secondary or tertiary alkyl group, an alkenyl group, an aryl group, and a cycloalkyl group, or R1 and R2 are bound together to form a cyclic ring.
Dependencies are inferred from the claim text.