Fig. 5
a CV curves of the as-prepared Fe2O3−δ. b The initial three galvanostatic charge/discharge profiles of Fe2O3−δ. c Cycling performance and coulombic efficiencies of Fe2O3−δ and commercial Fe2O3 at 2 C. d Typical charge/discharge curves of Fe2O3−δ sample during long-term cycles at 2 C. e Rate performance of Fe2O3−δ at various current densities. f Charge/discharge curves of Fe2O3−δ sample at different current densities