Construction of hierarchical multilayered nanomaterials derived from Co-MOFs supported by pyromellitic acid for advanced lithium storage performance

Cobalt-based metal–organic frameworks (Co-MOFs) supported by pyromellitic acid (PMA) were synthesized using a facile one-pot solvothermal method. Morphologies and sizes were tuned by assembly of Co-MOFs in different solvent ratios. Multilayered derivatives were obtained by calcination of Co-MOFs at 350 °C under argon and used as anode material for lithium-ion batteries (LIBs), showing a high reversible specific capacity (1116.7 mA h g−1 after 100 cycles at a current density of 200 mA g−1). The excellent electrochemical performance may be attributed to the specific structure formed during calcination, that is to say, the inner layer of the material retained the porous MOFs, and a small amount of oxide and carbon layers wrapped around the outer layer of the MOFs.