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. 2016 Jan 18;7:10308. doi: 10.1038/ncomms10308

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The voltage-composition profiles are reported for two first cycles for cell C1 using Na₃V₂(PO₄)₂F₃ (b) and cell C2 using ‘Na_3.5V₂(PO₄)₂F₃' (a). The weight ratio of cathode to anode is 2.7 and 1.9 for C1 and C2 cell, respectively. The cells were cycled at a 0.2C rate (C rate being defined as the extraction of 2 Na from NVPF). For both cells a 1 M NaClO₄ in EC/DMC (50/50 by volume) electrolyte was used. The capacity is calculated based on the weight of positive materials. Inset in (b) shows the capacity retention in the first 20 cycles.