Carbonyl Functional Group Modified Metal–Organic Coordination Polymer with Improved Lithium-Storage Performance

Exploration of the structures and architectural design of crystalline porous metal–organic coordination polymer (MOCP) materials with boosted active lithium-storage functional groups is still an urgent requirement for MOCP structures with improved lithium-storage properties when applied as the electrodes for next-generation lithium-ion batteries. Herein, we synthesize a carbonyl functional group modified Co-based metal–organic coordination polymer (Co-BDBA-MOCP) via a one-step facile microwave-assisted solvothermal method and apply it as the electrode material for a lithium-ion battery for the first time. The unique petals-assembled rose-shaped morphology endows the Co-BDBA-MOCP structure with a more exposed surface and porous structure, which can provide more active sites and facilitate fast Li-ion transport. Thus, the boosted lithium-reaction activation of the Co2+ centers, the C═C groups of the benzene rings, and the modified C═O groups in the structure and further the extremely enhanced electrochemical performance can be achieved for the Co-BDBA-MOCP electrode. This electrode delivers an initial reversible capacity of 1401 mAh g–1 at a current density of 100 mA g–1 with ∼1150 mAh g–1 retained after 100 cycles, and a large reversible capacity of 743 mAh g–1 after 350 cycles at a large current of 500 mA g–1. The exploration of the active lithium reaction units modified metal–organic frameworks with more activated functional groups for lithium storage would further shed light on high-performance electrodes for next-generation rechargeable batteries.