Li4Ti5O12 prepared by Sr-doped for Li-ion batteries with enhanced electrochemical performance

Li4Ti5O12 (LTO) is considered as a new anode material with great potential because of its zero strain performance. To further improve the electrochemical behavior, Sr-doped LTO was synthesized via a facile hydrothermal method. The Sr2+ with bigger radius integrated into LTO did not change the origin crystal morphology of pure Li4Ti5O12 but attenuate the layered structure. XRD results testified that the lattice parameter of doped materials increases with the doping amount. EDS mapping further demonstrated the homogeneous distribution of strontium. Electrochemical tests show that Li3.975Sr0.025Ti5O12 presents optimal electrochemical properties. It possesses the highest initial discharge capacity of 215 mAh/g, while the pristine LTO just owns 163 mAh/g at 0.2 C. Li3.975Sr0.025Ti5O12 also delivers superior rate performance and cycling stability. It has a specific capacity retention of 80.02% at 10 C for 500 cycles, much higher than the 66.06% of pristine LTO. The thin and layered structure and increased electrical conductivity synergically improve the electrochemical performance of the doped material.

Automated summary

Sr-doped Li4Ti5O12 (LTO) was synthesized and showed improved electrochemical performance, including higher initial discharge capacity and better cycling stability, compared to pristine LTO.