LAUSR

Due to the adjustable structure and the broad application prospects in energy and other fields, the exploration of porous organic materials (MOP, COF, et al ) attracts extensive attention. In this work, we design and fabricate an imine-induced metal- and covalent-organic coexisted framework (Co-MOP@COF) hybrid based on the combination between the amino units from the organic ligands of Co-MOP and the aldehyde groups from COF. The obtained Co-MOP@COF hybrid with layer-decorated microsphere morphology exhibits good electrochemical cycling performance (a large reversible capacity of 1020 mAh g -1 after 150 cycles at 100 mA g -1 , and a reversible capacity of 396 mAh g -1 at 500 mA g -1 ) as the anode for Li-ion batteries. The metal- and covalent-organic coexisted framework structure endows the Co-MOP@COF hybrid with more surface area exposed in the exfoliated COF structure, which provides rapid lithium-ion diffusion, better electrolyte infiltration and the effective activation of functional groups. Therefore, the Co-MOP@COF hybrid material achieves the enhanced lithium storage mechanism involving multi-electron redox reactions, related to the Co(II) center and organic groups (C=C groups of benzene rings and C=N groups), and further the improved electrochemical performance.