A novel Mo_8.7Nb_6.1O_x@NCs egg-nest composite structure as superior anode material for lithium-ion storage

Anode materials of lithium-ion batteries (LIBs) endowed with high-rate performance and fast charging capability are crucial for future energy storage systems. Here, Mo_8.7Nb_6.1O_x@NCs (nitrogen-doped carbon nanotubes, NCs) egg-nest structure synthesized by an in-situ solvothermal method is reported. The Mo_8.7Nb_6.1O_x@NCs egg-nest exhibits high embedding potential, high pseudo-capacitance contribution rate (87.5%), and low charge transfer resistance. The electrochemical results show that Mo_8.7Nb_6.1O_x@NCs demonstrates excellent rate performance (reversible capacity of 196.8 mAh·Ag⁻¹ at 10 A·Ag⁻¹, and full charging only takes 1.1 min) and excellent cycle stability (reversible capacity of 513 mAh.Ag⁻¹ at 0.5 A.Ag⁻¹ combined with a capacity loss of only 5.4% after 100 cycles), outperforming the state-of-the-art literature. The full cell is assembled with Mo_8.7Nb_6.1O_x@NCs as the anode and LiFePO₄ as the cathode, which can provide a remarkably high energy density of 731.9 Wh·kg⁻¹, indicating its excellent prospect for practical applications.