Improved cycle capability of Titanium-doped Fe2O3 anode material for Li-ion batteries

- The Ti0.9Fe1.1O3 samples have been synthesized by a simple solid-state route.
- The specific capacity of Ti0.9Fe1.1O3 exceeded 450 mAh g−1.
- The specific capacity could be kept even after 500 cycles.
- The remarkable performance was attributed to the stable solid solution structure.
- In Ti0.9Fe1.1O3, titanium is inactive and only support the unstable structure.

Ti0.9Fe1.1O3 with a solid solution structure has been synthesized and investigated as an anode material for rechargeable Li-ion batteries. Ti0.9Fe1.1O3 was prepared by a solid-state reaction of Fe, Fe2O3 and TiO2. Without other modification, the obtained Ti0.9Fe1.1O3 exhibited high discharge capacity and remarkable cycle capability compared with the commercial Fe2O3 sample. A reversible capacity of 454.9 mA h g−1 and coulombic efficiency of 100% at 100 mA g−1 could be achieved and kept even after 500 cycles. The prominent electrode performance could be attributed to the stable solid solution structure, in which Titanium is inactive and only support the unstable structure during reversible electrochemical processes.