Current collector

A current collector comprising:

• a current collector body;
• and
• a polymer layer on at least one side of the current collector body,
• wherein the polymer layer comprises a conductive copolymer comprising a polar functional group, and
• wherein the polar functional group comprises one group selected from the group consisting of a carboxyl group, a hydroxy group, an amino group, a cyano group, a nitro group, an ether group, and a functional group of Formula 3 below:
• where L4 is a single bond, an alkylene group or an alkylidene group, L3 is an alkylene group or an alkylidene group, R5 is hydrogen or an alkyl group, and n is a number in a range of 1 to 10.