Na-Doped Li₄Ti₅O₁₂as an Anode Material for Sodium-Ion Battery with Superior Rate and Cycling Performance

Li 4 Ti 5 O 12 is a well-known "zero strain" anode for Lithium ion batteries with excellent capacity retention and good thermal stability. But it exhibits poor capacity retention and unsatisfactory rate properties when used in Sodium ion batteries. Herein, Na doped Li 4 Ti 5 O 12 (Na x Li 4-x Ti 5 O 12 ) used as an anode for sodium-ion battery has shown higher specific capacity and better cycling and rate performance compared with pristine Li 4 Ti 5 O 12 electrode. With an appropriate binder, the Na 0.11 Li 3.89 Ti 5 O 12 electrode delivers a reversible capacity over 150 mAh g −1 and shows excellent stability over 800 cycles with a very small capacity decay of 0.025% per cycle.