Electrode active material for secondary battery and method of manufacturing same

An electrode active material comprising:

• an active material core;
• and
• a conductive polymer layer on a surface of the active material core,
• wherein the conductive polymer layer comprises a thiophene-based polymer,
• wherein the thiophene-based polymer has a weight average molecular weight in a range of 500 g/mol to 20,000 g/mol,
• wherein the thiophene-based polymer comprises a polymerization unit of Formula 3:
• wherein L3 and L4 are each independently a single bond or an alkylene group, R2 is a carboxyl group, a hydroxyl group, an amine group, a nitro group, an ether group, a carbonyl group, or a flowable functional group, and R3 is hydrogen, a carboxyl group, a hydroxyl group, an amine group, a nitro group, an ether group, a carbonyl group, or a flowable functional group,
• wherein the flowable functional group is an alkyl group comprising 3 or more carbon atoms, an alkoxy group comprising 3 or more carbon atoms, a carbonyl group comprising an alkyl group comprising 3 or more carbon atoms, a carbonyloxy group comprising an alkyl group comprising 3 or more carbon atoms, or a functional group of Formula 2:
• wherein L1 is a single bond or an alkylene group, L2 is an alkylene group, R1 is an alkyl group, and n is a number in a range of 1 to 10.