Thiophene-diketopyrrolopyrrole-based polymer derivatives/reduced graphene oxide composite materials as organic anode materials for lithium-ion batteries

Abstract

In this work, we synthesized thiophene-diketopyrrolopyrrole-based (TDPP-based) polymer derivatives/reduced graphene oxide (RGO) composites. The interaction between the carboxyl groups on polymer and the hydroxyl groups on graphene oxide endows the composite excellent electrochemical performance as anode for lithium-ion batteries (LIBs). The participation of RGO decreases the discharge voltage, enhances electronic conductivity, and improves the capacity retention for P(C-TDPP-AC)/RGO (contains carbazole (C) and acetyl (AC)) and P(F-TDPP-AC)/RGO (contains fluorene (F)) composite anode. More than that, P(C-TDPP-AC)/RGO anode possesses excellent comprehensive electrochemical performance for LIBs. The discharge specific capacity for P(C-TDPP-AC)/RGO anode is as high as 857 mAh g−1 at 1000 mA g−1 for 1000 cycles, while its cyclic stability is up to 83 % and its energy density and power density are 643 Wh kg−1 and 774 W kg−1, respectively. Therefore, P(C-TDPP-AC)/RGO electrode has great potential to become a candidate for promising anode for LIBs.