SnO2 hollow nanospheres assembled by single layer nanocrystals as anode material for high performance Li ion batteries

SnO2 hollow nanospheres were successfully synthesized via a facile one-step solvothermal method. Characterizations show that the as-prepared SnO2 spheres are of hollow structure with a diameter at around 50 nm, and especially, the shell of the spheres is assembled by single layer SnO2 nanocrystals. The surface area of the material reaches up to 202.5 m(2)/g. As an anode material for Li ion batteries, the sample exhibited improved electrochemical performance compared with commercial SnO2 particles. After cycled at high current rate of 0.5 C, 1 C and 0.5 C for 20 cycles, respectively, the electrode can maintain a capacity of 509 mAh/g. The suitable shell thickness/diameter ratio endows the good structural stability of the material during cycling, which promises the excellent cycling performance of the electrode. The large surface area and the ultra thin shell ensure the high rate performance of the material. (C) 2014 Lin Guo. Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. All rights reserved.