Nonaqueous electrolyte solution and lithium secondary battery using same

A non-aqueous electrolyte solution comprising:

• a lithium salt;
• a non-aqueous solvent;
• a cyclic carbonate compound having an unsaturated bond;
• and
• a compound expressed by the following general formula (Ib);
• wherein R21 represents an alkyl group having 1-12 carbon atoms that may be substituted by a fluorine atom or an alkenyl group having 2-12 carbon atoms that may be substituted by a fluorine atom, wherein the alkyl group or alkenyl group may have an ether linkage within its chain.

A The non-aqueous electrolyte solution comprising:

• a lithium salt;
• a non-aqueous solvent;
• a cyclic carbonate compound having an unsaturated bond in a concentration of 0.01 weight % to 8 weight %;
• and
• a compound expressed by the following general formula (Ic) in a concentration of 0.01 weight % to 5 weight %;
• CFnH(3-n)CH2X3 (Ic)
• wherein, n represents an integer of 1-3 and X3 represents a group selected from the groups consisting of the following formulae (Ic-1)-(Ic-4)
• O—R31 (Ic-1)
• —O—Y3—O—R32 (Ic-2)
• wherein R31-R34 represent, independently of each other, an alkyl group having 1-20 carbon atoms that may be substituted by a halogen atom, and Y3 represents a divalent hydrocarbon group having 1-10 carbon atoms that may be substituted by a halogen atom.

A non-aqueous electrolyte solution comprising:

• a lithium salt;
• a non-aqueous solvent;
• and
• a compound expressed by the following general formula (IIc) in a concentration of 0.01 weight % to 4 weight % with respect to the non-aqueous electrolyte solution
• wherein Z6 represents an integer of 2 or larger, X6 represents a Z6-valent hydrocarbon group having 1-6 carbon atoms, R61 represents, independently of each other, an alkyl group having 1-6 carbon atoms, R62 represents, independently of each other, an alkyl group having 1-6 carbon atoms substituted by one or more halogen atoms and any two or more of R61 and/or R62 may be linked with each other to form a ring.