Abstract
Hierarchical architecture of anatase/rutile-mixed phases TiO2 with hollow interior was successfully fabricated via a Topotactic synthetic method, including the synthesis of CaTiO3 precursors and transforming them into TiO2 through ion-exchange process. The as-synthesized TiO2 hierarchical architectures as the anode materials were used as lithium-ion batteries (LIBs). Compared with TiO2 samples, the TiO2@SnO2-5% shows the improved lithium storage capacity, cycling performance and rate properties. The impedance of the TiO2 electrode decreases evidently after adding few amount of SnO2. The hollow hierarchical structure with different compositions provide much more active sites, and well connect interface among anatase, rutile, and SnO2, facilitating the electron and ion transport quickly and efficiently. Addition appropriate number of SnO2 not only well kept the hierarchical architecture but also enhanced the capacity and conductivity of the TiO2 sample. As a result, TiO2@SnO2-5% exhibited excellent lithium storage performance.
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