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Niobium-based oxides, such as iron niobate (FeNb 2 O 6 ), are promising for high-rate lithium storage but suffer from low electrical/ionic conductivity, leading to rapid energy/power density decay. Herein, a synergistic strategy of nanoporous structure design and carbon nanofiber composite is employed. Fe-MOFs is used as precursors to prepare FeNb 2 O 6 /carbon nanofiber (FeNb 2 O 6 /CNF) composite via solvothermal and electrospinning methods. The mass ratio of MOF-235 to NbCl 5 is optimized to obtain porous FeNb 2 O 6 nanoparticles. Compared with FeNb 2 O 6 /C powder electrode, FeNb 2 O 6 /CNF exhibits a higher ionic diffusion coefficient. In addition, the FeNb 2 O 6 /CNF electrode achieves a higher specific capacity of 337 mA h g –1 at 1 A g –1, with 81% capacity retention after 500 cycles. At 5 A g –1, it maintains a specific capacity of about 130 mA h g –1, revealing that the carbon nanofiber structure significantly enhances electrochemical performance. Moreover, the capacitive control behavior of lithium-ion storage in FeNb 2 O 6 /CNF has been confirmed, demonstrating excellent kinetic performance.
Chen et al. (Wed,) studied this question.