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Controllable synthesis of TiO_2 core-shell nanostructure and lithium storage performance thereof

Cheng He;Guo Bing;School of Chemistry and Chemical Engineering,Hefei University of Technology;  
Ti O2core-shell nanostructures have been hydrothermally prepared through controlling hydrolysis rate of Ti4+ions by urea and H2O2in(NH4)2Ti F6 aqueous solution.Electrode materials were obtained by post-heating at 500 ℃.The structure,morphology,and electrochemical performance prepared materials were characterized by XRD,FESEM,and galvanostatic charge-discharge measurements and cyclic voltammetry.Result indicated that the products had well-defined morphologies,uniform sizes,and good dispersion.In comparison with commercial Ti O2 nanoparticles,core-shell structures had unique porous structures and excellent structural stability,thus exhibiting a superior cycle performance and rate capability.Ti O2 coreshell nanostructures can deliver a discharge capacity of 344 m A·h/g and 72 m A·h/g at 0.1C and 10 C rates,respectively.Moreover,Ti O2core-shell nanostructures delivered a high retained capacity about 80% at 1C after 100 cycles.
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