Centrifugally Spun SnO₂ Microfibers Composed of Interconnected Nanoparticles as the Anode in Sodium-Ion Batteries

SnO₂ microfibers were synthesized by using centrifugal spinning technology and were evaluated as the anode in sodium-ion batteries. The as-prepared SnO₂ microfibers are composed of interconnected nanoparticles with small interparticle openings. The 1-demensional fibrous morphology, fine particle size, and open pore structure result in reduced electrochemical impedance and enhanced electrochemical performance. The highest capacity achieved is 567mAhg^-1 at 20mAg^-1. At a much higher current density of 640mAg^-1, the microfiber electrode still retains a high capacity of 158mAhg^-1 after 50 cycles. The SnO₂ microfibers also demonstrate good rate performance in a current range of 20-640mAg^-1. The results demonstrate that SnO₂ microfibers are a potential anode material candidate for sodium-ion batteries and that centrifugal spinning offers a feasible solution for the large-scale production of fibrous electrode materials.