| abstract |
Provided is a lithium secondary battery that is excellent in safety, suppresses side reactions of a nonaqueous electrolyte, and has excellent cycle life and output performance. A lithium secondary battery comprising a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein the separator is made of a porous substrate, and inorganic particles and a binder polymer are formed on at least one surface of the porous substrate. And a non-aqueous electrolyte containing a lithium salt that can be ionized, an organic solvent, and a dinitrile compound represented by Chemical Formula 1, wherein the dinitrile compound is 100 parts by weight of the lithium salt and the organic solvent. A lithium secondary battery containing a non-aqueous electrolyte containing 0.1 to 10 parts by weight. (R1 and R2 and R3 and R4 each one is RCN, R is each independently alkylene, alkenylene, arylene, etc .; the rest of R1 to R4 are H, alkyl, alkoxy, etc.) [Selection] None |