Thiophene-Diketopyrrolopyrrole-Based Polymer Derivatives/Reduced Graphene Oxide Composite Materials as Organic Anode Materials for Lithium-Ion Batteries

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)& nbsp;at 1000 mA g(-1)& nbsp;for 1000 cycles, while its cyclic stability is up to 83 % and its energy density and power density are 643 Wh kg(-1)& nbsp;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.