Conjugated ladder-type polymers with multielectron reactions as high-capacity organic anode materials for lithium-ion batteries

Ladder-type conjugated polymers (LCPs) have attracted extensive attention in rechargeable lithium-ion batteries (LIBs) due to their inherent stability, poor solubility, tunable structure, and strong π—π intermolecular interactions. Herein, we describe the synthesis of two heteroatom nitrogen/oxygen-rich LCPs (TABQ-NTCDA, named TNL, TABQ-PMDA, TPL) by polycondensation reaction tetromino-benzoquinone (TABQ) aromatic dianhydride. Benefiting from rigid backbone, large skeleton heteroatom-driven superlithiation process polycyclic systems, acting as organic anode materials for LIBs display high specific capacity long-term cycle stability. In particular, TNL displays a reversible 1063.5 mA h g−1 at 0.05 A g−1, good cyclic performance with retention 75.2% after 1000 cycles 1 excellent rate capability 260.6 even 2 g−1. addition, storage mechanism was further confirmed theoretical calculations, suggesting multiple active sites C=O, C=N, rings storage. Furthermore, full cell is also assembled pairing LiCoO2 cathode, indicating feasibility practical application.