Electrospun Na Doped Li2tisio5/C Nanofibers With Outstanding Lithium-Storage Performance

Na doped Li2TiSiO5/C (Li2-xNaxTiSiO5/C) nanofibers have been synthesized by electrospinning followed via annealing, and the doping amount has been optimized. The results show that the electrochemical properties of Li2TiSiO5/C could be significantly improved by Na-doping with an appropriate amount. The Li1.75Na0.25TiSiO5/C nanofibers exhibit the best electrochemical performance, which can reach 333.8 (after 500 cycles) and 329.6 mAh g(-1) (after 1000 cycles) at 0.5 and 1 A g(-1), respectively. Even after 1500 cycles at 5 A g(-1), the Li1.25Na0.25TiSiO5/C nanofibers could deliver a specific capacity of 222.2 mAh g(-1) and show outstanding cycleability. The excellent electrochemical performance could be attributed to the rational introduction of the sodium, the complete carbon coating, and the unique one-dimensional structure. This kind of comprehensive strategy demonstrates the synergistic effect that may promote Li2TiSiO5 as the next commercially available lithium-ion battery.