ELECTRODE CURRENT COLLECTOR

An electrode current collector that includes a current collector body and a polymer layer formed on the current collector body, where the polymer layer includes a copolymer containing a first thiophene unit having a hydrocarbon group with 10 or more carbon atoms and a second thiophene unit having a hydrocarbon group with 9 or less carbon atoms, and the electrode current collector can exhibit excellent electrical characteristics, including low resistance, in a normal state in a secondary battery or the like, and can ensure stability through an increase in resistance in an abnormal state. Also provided are uses of the electrode current collector.