Patent ID: 7217477

Claim:
A non-aqueous electrolyte solution comprising a lithium salt, an aprotic solvent, and an organometallic compound represented by the following Chemical Formula: wherein R 1 and R 2 , which are independently or simultaneously an alkyl group with 1 to 4 carbon atoms, an alkoxy group with 1 to 4 carbon atoms, an acetyl group, a sulfonic acid group, or fluorocarbon, acetoxy, —OSO 3 H, —CF 3 , or a phenyl group or phenoxy group substituted by an alkyl group with 1 to 4 carbon atoms or a halogen; M is an atom selected from the group consisting of Al, B, Si, Ti, Nb, V, Cr, Mn, Fe, Co, Ni, Ga, Zr and Ta; x is a valence of a central metal atom; and y is a value satisfying 0≦y<x−2.