HIGHLY ION-SELECTIVE COMPOSITE POLYMER ELECTROLYTE MEMBRANES COMPRISING METAL-ION BLOCKING LAYER, REDOX FLOW BATTERIES COMPRISING THE SAME, AND ELECTROCHEMICAL DEVICES COMPRISING THE SAME

Disclosed is a composite polymer electrolyte membrane comprising: a support membrane; a metal ion-blocking layer stacked on the support membrane; a stabilization layer; and a protecting layer, wherein the support membrane includes a cation conductive polymer.