Electrospun Sn-doped LiTi2(PO4)3/C nanofibers for ultra-fast charging and discharging

Abstract

Sn-doped LiTi₂(PO₄)₃/C composite nanofibers are synthesized by a facile electrospinning process. The unique one dimensional nanostructure combined with a uniform electrically conductive carbon matrix allows high-rate transportation of lithium ions and electrons. Besides, Sn-doping could further decrease the electrochemical resistance. Sn-doped LiTi₂(PO₄)₃/C composite nanofibers exhibit excellent electrochemical performance, especially ultra-fast charging/discharge capability. At a charging rate of about 600 C (64 A g⁻¹, 6 s), 66.2% capacity (68.9 mA h g⁻¹) could be obtained when matched with a Li metal counter electrode. They also exhibit excellent electrochemical properties as an anode material for aqueous rechargeable lithium batteries. Sn-doped LiTi₂(PO₄)₃/C composite nanofibers are promising electrode materials for both nonaqueous and aqueous lithium ion batteries.