Abstract
Ti-based compounds have been extensively investigated as electrode materials for Li-ion/Na-ion batteries because of their superior Li-/Na-storage capability especially for outstanding safety and stability. Here, we report on a mild microwave-assisted route for the synthesis of nanostructured bi-phase TiO2 nanobelts with tunable ratios, and explore the Li-diffusion kinetics of heterostructured anatase/TiO2-B nanobelts that play an essential role in Li-storage performances. Detailed kinetic analysis based on cyclic voltammetry at different scanning rates and galvanostatic charge-discharge profiles demonstrates phased-dependent electrochemical lithiation behaviors in bi-phase TiO2 nanobelts. It is demonstrated that open tunnels along the b and c-axes in the TiO2-B phase benefit the Li+-ion diffusion, and the TiO2-B phase with intercalation pseudocapacitance contributes a high specific capacity. Moreover, the grain boundaries inside heterostructured anatase/TiO2-B nanobelts may provide effective active sites for Li storage.
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