Hierarchical TiO2 /SnO2 Hollow Spheres Coated with Graphitized Carbon for High-Performance Electrochemical Li-Ion Storage.

ABSTRACT

A self-templated strategy is developed to fabricate hierarchical TiO2 /SnO2 hollow spheres coated with graphitized carbon (HTSO/GC-HSs) by combined sol-gel processes with hydrothermal treatment and calcination. The as-prepared mesoporous HTSO/GC-HSs present an approximate yolk-double-shell structure, with high specific area and small nanocrystals of TiO2 and SnO2 , and thus exhibit superior electrochemical reactivity and stability when used as anode materials for Li-ion batteries. A high reversible specific capacity of about 310 mAh g-1 at a high current density of 5 A g-1 can be achieved over 500 cycles indicating very good cycle stability and rate performance.