Improved the lithium storage capability of Na2Li2Ti6O14 by barium doping

In this paper, a series of Na 2   −   2x Ba x Li 2 Ti 6 O 14 (x   =   0, 0.25, 0.5, 0.75, 1) samples are prepared simply by a solid state reaction method, and among them, NaBa 0.5 Li 2 Ti 6 O 14 (x   =   0.5) exhibits the smallest particle size and best electrochemical properties . According to the electrochemical results, the initial charge specific capacity of NaBa 0.5 Li 2 Ti 6 O 14 (x   =   0.5) reaches 109.6   mAh   g −   1 at the current density of 50   mA   g −   1 , which is much higher than other samples. The reversible capacity can still be held at 108.6   mAh   g −   1 after 50   cycles. In addition, NaBa 0.5 Li 2 Ti 6 O 14 (x   =   0.5) also displays outstanding rate property with high charge specific capacities of 128.8, 117.7, 110, 100.2, 98.1   mAh   g −   1 at 100, 200, 300, 400 and 500   mA   g −   1 , respectively. Our results suggest that the smaller particle size, decreased electrochemical resistance and improved ionic conductivity of Na 2 Li 2 Ti 6 O 14 after Ba doping are main contributing factors in enhancing the lithium storage capability, and among them, NaBa 0.5 Li 2 Ti 6 O 14 (x   =   0.5) is a potential anode material for rechargeable lithium-ion batteries.