Electrospun Na doped Li₂TiSiO₅/C nanofibers with outstanding lithium-storage performance

Na doped Li₂TiSiO₅/C (Li_2-xNa_xTiSiO₅/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 Li_1.75Na_0.25TiSiO₅/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 Li_1.75Na_0.25TiSiO₅/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.