Abstract
Abstract In this paper, we propose a facile strategy to synthesize the porous structure TiO 2 @C composites through a two-step method, in which the precursor of MIL-125(Ti) was firstly prepared by solvent thermal method and then calcined under inert atmosphere. When employed as anodes for Na ion batteries, TiO 2 @C composites can exhibit a superior cyclability with a reversible sodium storage capacity of 148 mAh g −1 at the current density 0.5 A g −1 after 500 cycles and an excellent rate performance with a capacity of 88.9 mAh g −1 even the current reached to 2.5 A g −1 due to the dispersion of anatase TiO 2 throughout amorphous carbon matrix and the synergistic effect between the anatase TiO 2 nanocrystals and carbon matrix, which can availably enhance the electric conductivity and alleviate the volumetric variation of TiO 2 during the insertion/extraction process of Na + .
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