Nonaqueous electrolyte
AssigneeE Square Technologies Co, Ltd.
InventorsYoung Gyu Kim, Seung Kee Kim, Min Seong Kim, Young Bae Roh
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Abstract
Disclosed is a nonaqueous electrolyte for a lithium-ion secondary battery that contains an addictive for preventing destruction of a solid electrolyte interface (SEI) layer and hence decomposition of the electrolyte that may cause generation of a gas, thereby preventing swelling of the battery caused by the gas generated from the inside of the battery at a high temperature. More specifically, the present invention provides an electrolyte that includes, as an additive, 2-sulfobenzoic acid cyclic anhydride represented by the formula 1: The electrolyte contains the additive in an amount of 0.1 to 10.0 wt. %.
Claims3
A nonaqueous electrolyte for a lithium-ion secondary battery which uses at least one of LiCoO2, LiMnO2, LiMn2O4, LiNiO2, or a composite compound, LiM1xM2yO2 as an anodic active material, and crystalline or amorphous carbon or lithium as a cathodic active material, wherein M1 and M2 are a metal element;
- and x and y are a rational number from 0 to 2, the electrolyte comprising:
- a mixed solvent comprising at least one carbonate solvent, as a solvent;
- at least one lithium salt selected from LiPF6, LiBF4, LiClO4, LiN(SO2CF3)2 and LiN(SO2CF2CF3)2, as an electrolytic salt;
- and
- 2-sulfobenzoic acid cyclic anhydride as an additive, represented by the formula 1:
Dependencies are inferred from the claim text.