CoNb2O6@MXene/CNFs composite anode materials for Li-ion batteries

Intercalation-type niobium-based oxides offer considerable promise as lithium-ion battery (LIB) anodes due to their safe operating voltages and structural robustness. However, their intrinsically poor electronic conductivity and sluggish ion transport impede practical deployment. Herein, we report a CoNb 2 O 6 @MXene/carbon nanofibers (CoNb 2 O 6 @MXene/CNFs) composite fabricated via electrospinning and controlled annealing. By embedding CoNb 2 O 6 nanoparticles and highly conductive Ti 3 C 2 T x MXene nanosheets within a flexible carbon nanofiber framework, this hierarchical architecture establishes efficient multi-dimensional electron/ion transport pathways. The excellent electrical conductivity of MXene enhances the charge transfer kinetics, while the carbon nanofiber matrix prevents particle aggregation and buffers volume expansion. Consequently, the optimized electrode achieves a high initial discharge capacity of 762.2 mAh g −1 at 0.1 A g −1 , maintaining 378.6 mAh g −1 after 200 cycles.