Non-aqueous electrolyte and secondary battery comprising the same

摘要

Disclosed is a secondary battery including an electrolyte and/or an electrode, the electrolyte including an electrolyte salt and an electrolyte solvent, i) a cyclic carbonate compound substituted with at least one halogen element; and ii) a compound containing a vinyl group in a molecule thereof, and the electrode including a solid electrolyte interface (SEI) layer partially or totally formed on the surface thereof by electrical reduction of the two compounds.

主权项

1. A secondary battery comprising a cathode, an anode, and an electrolyte, wherein the electrolyte consists of:
(i) LiPF6 as an electrolyte salt; (ii) a mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC) as an electrolyte solvent; (iii) 3-fluoro ethylene carbonate or 3,4-difluoro ethylene carbonate; and (iv) allyl prop-2-ene-1-sulfonate, wherein an active material of the anode is a carbonaceous material selected from the group consisting of graphite, carbon fiber, activated carbon and a mixture thereof.