Intermolecular channel expansion induced by cation-π interactions to enhance lithium storage in a crosslinked π-conjugated organic anode

The design and synthesis of novel π-conjugated polymers receive tremendous attention in electrochemical energy storage . We report a lithium-doped crosslinked π-conjugated polymer, PTAT@LiCl, with excellent electrochemical performance as an anode material for lithium ion batteries (LIBs). Benefiting from a wider range of intermolecular channel caused by cation-π interaction inducing lithium ion insert into polymer network , the prepared PTAT@LiCl shows high capacity (892 mAh g −1 , 100 mA g −1 ), excellent rate performance (200 mAh g −1 , 4C), and outstanding cycle life (500 cycles). This work provides a new insight into the performance enhancement of organic LIBs through noncovalent cation-π (Li + -π) interaction between lithium ions and large π-conjugated aromatic ring , which are meaningful for the potential application of LIBs.