Tantalum-doped lithium titanate with enhanced performance for lithium-ion batteries

Abstract A series of Tantalum-doped lithium titanate (Ta-doped Li 4 Ti 5 O 12 ) samples have been successfully synthesized by one step solid-state method using TiO 2 , Li 2 CO 3 , and Ta 2 O 5 as raw materials. The Li 4 Ti 5 O 12 with only 0.1 at% Ta doping (Li 4 Ti 4.995 Ta 0.005 O 12 ) exhibits higher rate capability and better cyclic stability than the pristine Li 4 Ti 5 O 12 . Li 4 Ti 4.995 Ta 0.005 O 12 could deliver 95.1 mAh g −1 at 10C with much lower overpotential (216.1 mV) while the pristine Li 4 Ti 5 O 12 delivers only 50.4 mAh g −1 at 10C with higher overpotential of 392.2 mV. As indicated by XRD, HRTEM and electrochemical characterizations, Ta doping in Li 4 Ti 5 O 12 would enlarge the lattice parameter of the Li 4 Ti 5 O 12 , and facilitate the Li + diffusion during the charge/discharge process. In addition, the higher charge compensation of the stoichiometric reduction of Ti 4+ to Ti 3+ by introducing Ta increases the electronic conductivity of Li 4 Ti 5 O 12 . The improved ionic conductivity and electronic conductivity are beneficial to the electrochemical performance of Li 4 Ti 5 O 12 . As a result, Ta doping is a new strategy for enhancing the electrochemical performance of Li 4 Ti 5 O 12 .

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