Ni(II)-Based Porphyrin-Conjugated Microporous Polymers as Promising Anode for Lithium Storage

Conjugated microporous polymers (CMPs) have emerged as promising electrode materials for secondary lithium-ion batteries (LIBs), owing to their intrinsic insolubility, structural tunability, permanent porosity, and robust reversibility toward lithium intercalation and deintercalation. However, achieving the simultaneous optimization of capacity, rate performance, and cycling stability remains a long-standing challenge. Herein, we designed a rationally engineered porphyrin-based CMP (NiP-CMP) that integrates multiple electrochemically active sites, including metal-N₄ conjugated macrocycles and conjugated alkyne linkages, within a robust π-conjugated framework. By fine-tuning the polycondensation conditions, NiP-CMP with a high specific surface area (1110 m² g^-1) was obtained, ensuring efficient ion diffusion and charge transport. Benefiting from its well-defined conjugated architecture and abundant electrochemically active centers, NiP-CMP delivers a high specific capacity of ∼702 mA h g^-1 at 0.1 A g^-1, together with a rate capability (355 mA h g^-1 at 1 A g^-1) and long-term cycling stability. This work demonstrates a strategic design that effectively resolves the electrode material "trilemma", achieving high capacity, fast kinetics, and durability simultaneously, and thus offers a viable design paradigm for high-performance organic electrode materials in energy storage applications.