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. 2015 Apr 24;6:6954. doi: 10.1038/ncomms7954

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(a) The second, tenth and thirtieth charge/discharge profiles at a current rate of C/10 (7.6 mA g⁻¹) in the voltage range of 2.5–3.85 V versus Na⁺/Na. (b) Rate capability. The capacity versus cycle number at various current rates. (c) Long-term cycling performance. The capacity and Coulombic efficiency versus cycle number at a current rate of 1C. (d) The second, tenth and thirtieth charge/discharge profiles at a current rate of C/10 (11.2 mA g⁻¹) in the voltage range of 0.5–2.5 V versus Na⁺/Na. (e) Rate capability. The capacity versus cycle number at various current rates. (f) Long-term cycling performance. The capacity and Coulombic efficiency versus cycle number at a current rate of 1C.