Porphyrin-based conjugated microporous polymers with dual active sites as anode materials for lithium-organic batteries

Conjugated microporous polymers have been regarded as ideal electrode materials for green lithium-ion batteries (LIBs) considering their advantages such as insolubility, adjustable structure and porosity. Herein, we synthesize porphyrin-based CMPs (Co-PCMPs) with dual active sites composed of metal-N4 conjugated macrocycle and conjugated carbonyl groups through the condensation polymerization. In view of the rational design and unique organic skeleton, when used as the anode material for LIBs, Co-PCMPs show a high capacity (700 mAh g(-1) at 0.05 A g(-1)) and excellent rate capability (400 mAh g(-1) at 1.0 A g(-1)). Meanwhile, theoretical calculations are used to further study the lithium storage mechanism of Co-PCMPs as the anode material for LIBs. In addition, a full cell is also assembled by using LiCoO2 as the cathode material and Co-PCMPs as the anode material, which also shows a high capacity (212 mAh g(-1) at 0.05 A g(-1)) and good rate capability (116 mAh g(-1) at 0.2 A g(-1)), implying the possibility of practical applications of this type of conjugated microporous polymers. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.