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Hierarchical TiO2 /SnO2 Hollow Spheres Coated with Graphitized Carbon for High-Performance Electrochemical Li-Ion
Huiqi Xie1, Min Chen1, Limin Wu1
1Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, P. R. China.
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.