The double synergies of core-shell MnFe2O4@TiO2 mesoporous spheres for enhancing electrochemical performance of anode material as lithium-ion batteries

A promising anode material for lithium ion batteries, the core-shell MnEe(2)O(4)@TiO2 mesoporous spheres were synthesized by the chemical coprecipitation paired with calcinations. The dimeter of the mesoporous spheres is about 500 nm with TiO2 coating layer (about 10 nm). Compare to MnEe(2)O(4) particles, the core-shell MnEe(2)O(4)@TiO(2 )mesoporous spheres deliver the high initial capacity of 1295 mAh g(-1) at 0.1 C and excellent reversible capacity of 775 mAh g(-1) after 200 cycles. The improved performance is due to synergy between the different metal elements (MnEe(2)O(4) and TiO2) for enhancing insertion and extraction of lithium, and synergy between the core-shell and mesoporous structure for buffering the volume expansion and keeping the chemical stability of active material during the charge and discharge process. The novel design of the mesoporous core-shell composite as anode materials with the double synergies gives a new direction for improve the performance of LIBs.