fig2

Figure 2. (A) Discharge curves of FeF₃ and Fe₂O₃, which show that metal fluorides have higher operation potential than oxides. This figure is quoted with permission from Lemoine et al.^[10]. (B) False-color composite image of the converted electrode showing LiF (red) and Cu (green) phases separate from each other. This figure is quoted with permission from Wang et al.^[14]. (C) Voltage profiles of CuF₂/C (black) and NiO-CuF₂/C (red) electrodes. NiO coating reduces Cu dissolution and improves CuF₂ reversibility. This figure is quoted with permission from Seo et al.^[17]. (D) Schematic illustration of the asymmetric reaction pathway in Cu_yFe_1-yF₂. This figure is quoted with permission from Wang et al.^[18]. (E) Voltage profiles of Cu_0.5Fe_0.5F₂ for the first five cycles at 9.2 mA g^-1. This figure is quoted with permission from Wang et al.^[18].