Inhibitor of reduction of life cycle of redox shuttle additive and non-aqueous electrolyte and secondary battery comprising the same

1. A method for inhibiting the reduction of life cycle of a redox shuttle additive in a secondary battery that undergoes oxidation-reduction cycling comprising the steps of:

preparing the secondary battery comprising a cathode, an anode, a separator, and a non-aqueous electrolyte, the non-aqueous electrolyte comprises the redox shuttle additive, a non-aqueous solvent and an electrolyte salt,

wherein the non-aqueous electrolyte comprises an inhibitor of the reduction of life cycle of the redox shuttle additive consisting of a combination of vinylene carbonates represented by Formula 1, and unsaturated sultones represented by Formula 4:

wherein R 1 and R 2 each independently represents halogen, an alkyl group having 1˜12 carbon atoms;

wherein R 11 to R 14 each independently represents halogen, or an alkyl group having 1˜12 carbon atoms, and n is an integer ranging from 0 to 3.

2. The method of claim 1 , wherein the vinylene carbonates and unsaturated sultones are compounds that form a film on the surface of an anode.

3. The method of claim 1 , wherein the redox shuttle additive is an aromatic compound represented by Formula 5:

wherein R 15 to R 20 each independently represents hydrogen, halogen, aryl, an alkyl group having 1˜12 carbon atoms, or an alkoxy group having 1˜12 carbon atoms, and at least two of R 15 to R 20 are an alkoxy group having 1˜12 carbon atoms.

4. The method of claim 1 , wherein the redox shuttle additive is at least one aromatic compound selected from among dimethoxybenzenes.

5. The method of claim 1 , wherein the inhibitor is used in an amount of 0.1˜10 parts by weight based on 100 parts by weight of the total electrolyte containing the redox shuttle additive.

6. The method of claim 1 , wherein the redox shuttle additive is used in an amount of 0.1˜20 parts by weight based on 100 parts by weight of the total electrolyte.