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. 2015 Aug 27;6:8103. doi: 10.1038/ncomms9103

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(a) J–V curve for single PSC. (b) A typical J–V curve for the connected PSCs unit with four single PSCs connected in series. (c) Rate capabilities of LFPO–Li, LTO–Li and LFPO–LTO cells measured at various C-rates (1 C=170 mA g⁻¹) in the voltage ranges of 2.5–4.0, 1.0–3.0 and 1.0–2.6 V, respectively. (d–f) Typical charge–discharge curves of (d) LFPO–Li, (e) LTO–Li and (f) LFPO–LTO cells.