Conductive polymer film supporting LiFePO4 as composite cathode for lithium ion batteries

► Free-standing PEDOT-LiFePO4 composites for lithium ion batteries by dynamic three phase interline electropolymerization. ► PEDOT-LiFePO4 serves as current collector, binder and carbon filler free functional electrodes. ► LiFePO4 mass fraction of 33.5 wt.% in the composite film confirmed by TGA analysis. ► The cathode discharge capacity of the PEDOT-LiFePO4 composite film is 75 mAh g−1 at C/10.