Issue 69, 2014

Vacuum-annealing-tailored robust and flexible nanopore-structured γ-Fe2O3 film anodes for high capacity and long life Na-ion batteries

Abstract

Relatively high cost and limited resources are limiting the broad applications of Li-ion batteries. Na-ion batteries are one of the most promising replacement candidates because of abundant sodium resources, low price and similarity with Li insertion chemistry. For the first time, γ-Fe2O3 film was grown directly on a copper sheet with radio frequency magnetron sputtering as an anode for Na-ion batteries. Results show that the γ-Fe2O3 film annealed at 600 °C delivers a high reversible capacity of 450 mA h g−1 and nearly 100% capacity retention over 100 charge–discharge cycles, significantly outperforming all the previously reported examples. It is believed that the high performance of the Na-ion anode can be attributed to high temperature annealing producing nanopores for a large ion-inserting surface area and uniform γ-Fe2O3 particles firmly loaded on the surface of the Cu substrate to robustly retain the film structure during the Na-ion intercalation process for long cycle life. This work holds great promise for the fabrication of inexpensive and non-toxic Na-ion batteries for practical applications.

Graphical abstract: Vacuum-annealing-tailored robust and flexible nanopore-structured γ-Fe2O3 film anodes for high capacity and long life Na-ion batteries

Article information

Article type
Paper
Submitted
19 Mey 2014
Accepted
31 Jul 2014
First published
01 Aga 2014

RSC Adv., 2014,4, 36815-36820

Vacuum-annealing-tailored robust and flexible nanopore-structured γ-Fe2O3 film anodes for high capacity and long life Na-ion batteries

B. Sun, S. J. Bao, J. Le Xie and C. M. Li, RSC Adv., 2014, 4, 36815 DOI: 10.1039/C4RA04686B

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