Fabrication of Ba0.95M0.05Li2Ti6O14 (M = Ag, Pb, Al) as high performance anode candidates for lithium secondary batteries.

Using Ag, Pb and Al as dopants, Ba 0.95 M 0.05 Li 2 Ti 6 O 14 is fabricated as advanced anode candidate for repeated lithium storage. Owing to smaller ionic radius, Ag + , Pb 2+ and Al 3+ are successfully introduced into the lattice of BaLi 2 Ti 6 O 14 , which results in the formation of high purity Ba-site doped Ba 0.95 M 0.05 Li 2 Ti 6 O 14 (M = Ag, Pb, Al). Compared with the pristine sample, M-doped BaLi 2 Ti 6 O 14 exhibits higher reversible capacity, better rate capability and superior cyclability. Especially for Ba 0.95 Ag 0.05 Li 2 Ti 6 O 14 , it presents the best electrochemical property among all the as-prepared samples. It can deliver a high reversible charge capacity of 149.1 mAh g −1 after 100 cycles at the current density of 100 mA g −1 with capacity retention of 92.27%. In contrast, BaLi 2 Ti 6 O 14 only provides a lithium storage capacity of 126.9 mAh g −1 with capacity retention of 80.83%. In addition, its high structural stability and electrochemical reversibility are also demonstrated by in-situ X-ray diffraction observation. All these evidences show that metal doping may be an effective method to enhance the lithium storage capability of BaLi 2 Ti 6 O 14 . Especially for Ba 0.95 Ag 0.05 Li 2 Ti 6 O 14 , it can be used as possible anode candidate for rechargeable batteries. [ABSTRACT FROM AUTHOR]