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The system Cu-F-O was assessed with CALPHAD technique using computerized optimization procedure (PARROT). Two solid phases CuFe 2 O 4 and Fe 3 O 4 forming solid solution at high temperatures were modeled with compound energy formalism. Presence of Cu 1+ on tetrahedral sites in the samples with compositions close to CuFe 5 O 8 reported in the literature was taken into account. The second ternary compound, CuFeO 2 , was modeled as a stoichiometric phase. For the liquid phase, an ionic two-sublattice model was used. In total 17 adjustable parameters were optimized (9 for the spinel phase, 2 for the delafossite and 6 for the liquid phase) to describe the experimental data. The consistent dataset, which gives a description of the properties from 923 to 1273 K, was obtained.

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In this study, self-prepared nanostructured CuO electrodes show no capacity decay for 40 cycles at 0.1C in Li metal cells.

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