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. 2014 Jul 17;5:4358. doi: 10.1038/ncomms5358

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(a) Galvanostatic charging and discharging profiles of Na_2−xFe₂(SO₄)₃ cathode cycled between 2.0 and 4.5 V at a rate of C/20 (2 Na in 20 h) at 25 °C. First (1st) cycle is shown in dashed black line, and 2nd–5th cycle in solid black lines. (Inset) The differential galvanostatic profiles (dQ/dV) of Na_2−xFe₂(SO₄)₃ cathode showing two distinctive peaks during the first charge and broader three peaks upon subsequent discharging/charging processes. (b) Capacity retention upon cycling up to 30 cycles under various rate of C/20 (2 Na in 20 h) to 20C (2 Na in 3 min). (Inset) The discharge curves of Na_2−xFe₂(SO₄)₃ as a function of rate (from C/20 to 20C). Before each discharge, the cells were charged at C/10 to 4.2 V.