Synthesis of SnO_2 nano hollow spheres and their size effects in lithium ion battery anode application

摘要

Nano-sized SnO_2 hollow spheres are facilely synthesized by sol-gel method using the SiO_2 nanospheres as sacrificed templates, and their electrochemical properties are investigated as an anode application for lithium ion battery (LIB). The size of the hollow spheres is controlled by using different-sized templates. As-coated SnO_2 shell is almost amorphous and transformed into a rutile phase after annealing at 600 ℃. The size of the SnO_2 hollow spheres ranges from 25 to 100 nm. The shell thickness is almost constant (～ 5 nm) irrespective of the size of the hollow spheres. The hollow spheres showed the size dependent electrochemical properties, and the smallest SnO_2 (25 nm) hollow sphere exhibited a high reversible capacity of 750 mAh g~(-1) as well as excellent cyclability.