COMPOSITION FOR POSITIVE ELECTRODE PROTECTIVE FILM OF LITHIUM SECONDARY BATTERY, LITHIUM SECONDARY BATTERY INCLUDING THE POSITIVE ELECTRODE PROTECTIVE FILM AND METHOD OF MANUFACTURING THE LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide: a composition for a positive electrode protective film of a lithium secondary battery, including a polymer compound and an ionic liquid containing a borate-based anion; a lithium secondary battery including a positive electrode protective film prepared with the composition; and a method of manufacturing the lithium secondary battery.

SOLUTION: A composition for a positive electrode protective film of the present invention comprises a polymer compound and an ionic liquid containing a borate-based anion. A lithium secondary battery of the present invention comprises: a positive electrode; a negative electrode; a separator; and a positive electrode protective film. The positive electrode protective film comprises a polymer compound; and a borate group bonded to the polymer compound or a derivative thereof. A method of manufacturing a lithium secondary battery of the present invention comprises the steps of: mixing a polymer compound, an ionic liquid containing a borate-based anion, and a solvent to prepare a composition for a positive electrode protective film; coating the composition for a positive electrode protective film on at least one surface of a positive electrode or a separator; and forming an electrode group including the positive electrode, the separator and a negative electrode.

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