NONAQUEOUS ORGANIC ELECTROLYTE ADDITIVE AND PREPARATION METHOD THEREOF, NONAQUEOUS ORGANIC ELECTROLYTE, AND LITHIUM ION SECONDARY BATTERY

摘要

An embodiment of the present invention provides a non-aqueous organic electrolyte additive, a chemical structural formula of which is as shown by Formula (I), where R is H, halogen or R is one of: a C₁-C₁₀ alkyl group, a C₁-C₁₀ alkene group, a C₁-C₁₀ alkyne group, a C₁-C₁₀ alkoxy group, a halogen-containing C₁-C₁₀ alkyl group, a halogen-containing C₁-C₁₀ alkene group, a halogen-containing C₁-C₁₀ alkyne group and a halogen-containing C₁-C₁₀ alkoxy group. The non-aqueous organic electrolyte additive is oxidized and decomposed before an organic solvent in a high-voltage lithium-ion secondary battery, thereby forming a protection film that facilitates conduction of Li⁺ on a surface of an anode active material, increasing cyclic performance of a lithium-ion secondary battery at a high voltage, and achieving good stability. Embodiments of the present invention further provide a method for preparing a non-aqueous organic electrolyte additive, a non-aqueous organic electrolyte containing the non-aqueous organic electrolyte additive, and a lithium-ion secondary battery having a high energy density.