| abstract |
A non-aqueous electrolyte comprising (i) a non-aqueous solvent, especially mainly composed of a cyclic carbonate and a cyclic ester and optionally a linear carbonate, and (ii) an electrolyte salt, especially LiBF 4 , dissolved therein and (iii) a vinyl sulfone derivative having the formula (I): n n n wherein R indicates a C 1 to C 12 alkyl group, C 2 to C l2 alkenyl group, or C 3 to C 6 cycloalkyl, and also a lithium secondary battery using the same are disclosed. |