Graphene coated La3+/Sc3+ co-doped Li4Ti5O12 anodes for enhanced Li-ion battery performance

This work reports the synthesis of multi-layer graphene-coated, La and Sc co-doped Li4Ti5O12 (LLTSO/G) anodes for Li-ion battery where the co-doped LTO was synthesized via a modified sol-gel method. High-resolution transmission electron microscope (HRTEM) analysis revealed that graphene layers occupied the space between these three-dimensional LLTSO particles which provides a convenient transport path for electrons and thus resulted in a great rate electrode capability. The revisable capacity of this LLTSO is 176 mAh g−1 at 0.5C, after coating LLTSO with graphene the electrode exhibited excellent electrochemical performance, the discharge capacity is 101 mAh g−1 at 40C, much higher than the uncoated one (85 mAh g−1 at 40C). LLTSO/G was proved to be a promising high rate electrode material for lithium batteries.