Patent ID: 7425388

Claim:
An electrolyte for a lithium battery comprising a non-aqueous organic solvent, a lithium salt, and an additive comprising the polymerization reaction product of: a) a sulfone-based compound represented by Formula (1): where R 1 and R 2 are independently selected from the group consisting of primary alkyl groups, secondary alkyl groups, tertiary alkyl groups, alkenyl groups, and aryl groups; b) a C 3 to C 30 organic peroxide or azo-based compound; and c) a poly(ester)(meth)acrylate or a polymer thereof wherein the poly(ester)(meth)acrylate is a polymer derived from a (polyester)polyol with at least three hydroxyl (—OH) groups, where a portion or all of the hydroxyl groups are substituted with a (meth)acrylic ester and any remaining hydroxyl groups that are not substituted with the (meth)acrylic ester are substituted with a group having no radical reactivity.