Large-Scale Fabrication of Core-Shell Structured C/SnO₂ Hollow Spheres as Anode Materials with Improved Lithium...

Due to the high theoretical capacity as high as 1494 mAh g^-1 , SnO₂ is considered as a potential anode material for high-capacity lithium-ion batteries (LIBs). Therefore, the simple but effective method focused on fabrication of SnO₂ is imperative. To meet this, a facile and efficient strategy to fabricate core-shell structured C/SnO₂ hollow spheres by a solvothermal method is reported. Herein, the solid and hollow structure as well as the carbon content can be controlled. Very importantly, high-yield C/SnO₂ spheres can be produced by this method, which suggest potential business applications in LIBs field. Owing to the dual buffer effect of the carbon layer and hollow structures, the core-shell structured C/SnO₂ hollow spheres deliver a high reversible discharge capacity of 1007 mAh g^-1 at a current density of 100 mA g^-1 after 300 cycles and a superior discharge capacity of 915 mAh g^-1 at 500 mA g^-1 after 500 cycles. Even at a high current density of 1 and 2 A g^-1 , the core-shell structured C/SnO₂ hollow spheres electrode still exhibits excellent discharge capacity in the long life cycles. Consideration of the superior performance and high yield, the core-shell structured C/SnO₂ hollow spheres are of great interest for the next-generation LIBs.