| Summary: | In this paper, CoFe<sub>2</sub>O<sub>4</sub>@pyrolyzed bacterial cellulose (CFO@PBC) nanocomposites were synthesized by a hydrothermal process and an in situ composite technique as the cathode for rechargeable Li-O<sub>2</sub> batteries (LOB). CoFe<sub>2</sub>O<sub>4</sub>@Ketjenblack (CFO@KB) were prepared in the same way as the comparison. The as-prepared materials were characterized by SEM, XRD, and BET. The LOB with CFO@PBC-3 showed a maximum initial discharge capacity of 2660 mAh g<sup>−1</sup> (electrode) at the current density of 100 mAg<sup>−1</sup>, while the mass ratio of CoFe<sub>2</sub>O<sub>4</sub> and pyrolyzed bacterial cellulose was 3. The cyclic voltammetry of the CFO@PBC nanocomposite electrodes was investigated at 0.1 mVs<sup>−1</sup> in the voltage window of 2.0–4.5 V. With the limited capacity of 640 mAh g<sup>−1</sup> (electrode), the CFO@PBC-3 electrode showed the best cycle stability and higher cutoff voltage of discharging. The pyrolyzed bacterial cellulose, as the fibrous 3D backbone in CFO@PBC nanocomposite electrodes, produced better results than the CFO@KB.
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