A tin(iv) oxides/carbon nanotubes composite with core-tubule structure as an anode material for high electrochemistry...

SnO₂/CNTs composites with core-tubule structure are prepared by a facile wet chemical method. The investigation of electrochemical characteristics of the SnO₂/CNTs composites shows that the composites exhibit some advantages, such as stable core-tubule structure, small particle size of SnO₂, low electron-transfer resistance and faster lithium ion migration speed. The final product synthesized under optimized conditions can release a stable capacity of about 743 mA h g^-1 after 100 cycles at the current density of 0.4 A g^-1, 598 mA h g^-1 after 500 cycles at the current density of 4 A g^-1. Even at a super high current density of 8 A g^-1, the composite can still deliver a steady capacity of 457 mA h g^-1, and the discharge capacity can be restored to 998 mA h g^-1 when current density is decreased to 0.4 A g^-1.