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

Abstract

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 LiCoO 2 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. We synthesize porphyrin-based conjugated microporous polymers with dual active sites composed of metal-N4 conjugated macrocycle and conjugated carbonyl groups through the condensation polymerization, which could be served as anode materials to a full cell of lithium ion batteries. • Porphyrin-based conjugated microporous polymers were prepared by condensation reaction. • The polymers with dual active sites were used as anode materials for lithium ion batteries. • Full cell is also assembled to show the possibility of practical applications of these polymers.