Porous CuF2 derived from MOFs as cathode materials for Li-ion batteries

Copper fluoride (CuF 2 ) has demonstrated great potential as a cathode material for LIBs owing to its high energy density. In this study, a two-step synthesis method was proposed to prepare porous CuF 2 by using Cu-based metal-organic frameworks (MOFs). N 2 adsorption-desorption isotherms, along with SEM and TEM analyses, proved that the intermediates CuO exerted a certain influence on the pore structure of the final CuF 2 products. The porous CuF 2 achieved a first discharge capacity of 554 mAh ⋅ g − 1 at 0.1C. At a high current density of 5C, it delivered a rate capacity of 413 mAh ⋅ g − 1 within 1.5–4.2 V. The results of electrochemical impedance spectroscopy show that varying degrees of porosity influence the lithium-ion diffusion coefficient, leading to differences in electrochemical performances.