Transition metal oxides for high performance sodium ion battery anodes

• A series of transition metal oxides is successfully demonstrated as anodes for sodium ion batteries.
• The sodium uptake/extract is confirmed in the way of reversible conversion reaction.
• The pseudocapacitance-type behavior is observed in the contribution of sodium capacity.
• For Fe2O3 anode, a reversible capacity of 386 mAh g−1 at 100 mA g−1 is achieved over 200 cycles.
• As high as 233 mAh g−1 is sustained even cycling at a large current–density of 5 A g−1.

Sodium-ion batteries (SIBs) are attracting considerable attention with expectation of replacing lithium-ion batteries (LIBs) in large-scale energy storage systems (ESSs). To explore high performance anode materials for SIBs is highly desired subject to the current anode research mainly limited to carbonaceous materials. In this study, a series of transition metal oxides (TMOs) is successfully demonstrated as anodes for SIBs for the first time. The sodium uptake/extract is confirmed in the way of reversible conversion reaction. The pseudocapacitance-type behavior is also observed in the contribution of sodium capacity. For Fe2O3 anode, a reversible capacity of 386 mAh g−1at 100 mA g−1 is achieved over 200 cycles; as high as 233 mAh g−1is sustained even cycling at a large current–density of 5 A g−1.

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