Non-Aqueous Electrolyte and a Lithium Secondary Battery Comprising the Same
AssigneeSamsung SDI Co., Ltd.
InventorHyung-Gon Noh
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Abstract
Disclosed is an electrolyte of a lithium secondary battery comprising a lithium salt, an organic solvent, and at least one additive compound selected from the group consisting of compounds represented by the following formula (1) and derivatives thereof: where R1 is selected from the group consisting of hydrogen radicals, alkyls, aryls, cycloalkyls, alkenyls, alkynyls, ester radicals, and aliphatic carbonate radicals. The electrolyte improves both swelling inhibition properties at high temperature and capacity characteristics of a lithium secondary battery.
Claims14
A lithium secondary battery comprising:
- a positive electrode including lithium-nickel-based or a lithium-nickel-manganese-based oxide;
- a negative electrode including a lithium metal, a lithium-containing alloy, a material that is capable of reversible intercalation/deintercalation of lithium ions or a material that is capable of reversibly forming a lithium-containing compound;
- and
- a non-aqueous electrolyte comprising:
- a lithium salt,
- an organic solvent comprising a mixed solvent of a carbonate solvent and an aromatic hydrocarbon solvent,
- a first additive compound selected from the group consisting of compounds represented by formula (1) and derivatives thereof:
- where R1 is selected from the group consisting of alkyls, ester radicals, and aliphatic carbonate radicals, and the first additive compound is present in an amount from 0.01 to 5 wt % based on the total amount of the electrolyte, and
- a second additive compound selected from the group consisting of compounds represented by formula (3),
- wherein X is selected from the group consisting of halogen radicals, cyano radicals, and nitro radicals, and the second additive is present in an amount from 0.01 to 5 wt % based on the total amount of the electrolyte.
The lithium secondary battery according to claim 14, wherein the aromatic hydrocarbon solvent is selected from the group consisting of benzene, fluorobenzene, toluene, trifluorotoluene, xylene, and mixtures thereof.
The electrolyte of a lithium secondary battery according to claim 16 wherein the second carbonate-based additive compound is fluoroethylene carbonate.
Dependencies are inferred from the claim text.