Core-shell structured α-Fe2O3@Li4Ti5O12 composite as anode materials for high-performance lithium-ion batteries

In this paper, core-shell structured α-Fe 2 O 3 @Li 4 Ti 5 O 12 composite has been reported based on the design of structure and heterogeneous composite. Compared with pure α-Fe 2 O 3 and α-Fe 2 O 3 @TiO 2 composite, the core-shell structured α-Fe 2 O 3 @Li 4 Ti 5 O 12 composite can deliver a favorable reversible capacity of 898 mAh g −1  at 0.2 A g −1 (642 mAh g −1  at 2 A g −1 ) after 200 cycles and the reversible capacity still maintain 482 mAh g −1  at 3.2 A g −1 . The improved electrochemical property of the composite is attributed to its heterogeneous composite and unique structural advantages: high specific capacity and outstanding rate capability can be guaranteed by the synergistic effect between the inner core of α-Fe 2 O 3 and outer shell of spinel Li 4 Ti 5 O 12 , the large volume variation of α-Fe 2 O 3 can be effectively relieved by spinel Li 4 Ti 5 O 12 with unexceptionable structure stability, and the extra lithium ions storage as well as enhanced kinetics can be contributed by abundant grain boundaries and heterogeneous phase interfaces .