Nitridation Br-doped Li₄Ti₅O₁₂ anode for high rate lithium ion batteries

Br-doping Li₄Ti₅O₁₂ (Li₄Ti ₅O_11.7Br_0.3) is fabricated by conventional solid state method and shows enhanced cycling performance compared with pristine Li₄Ti₅O₁₂. After thermal nitridation for 90 min in NH₃, the Li₄Ti₅O_11.7Br _0.3 electrode exhibits better rate capability and excellent cycling performance. It delivers a reversible capacity of 138 mAh g^-1 and 104 mAh g^-1 after 100 cycles at 10C and 20C, respectively, which is approximately four and seven times higher than those of pristine Li ₄Ti₅O₁₂ at the same current rates. This work indicates the feasibility of improving cycling performance and rate capabilities of Li₄Ti₅O₁₂ through controlling both surface termination and bulk doping procedures.