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Fig. 1 | Nano Convergence

Fig. 1

From: Reversible flowering of CuO nanoclusters via conversion reaction for dual-ion Li metal batteries

Fig. 1

Field-emission scanning electron microscopy images of the a as-prepared multi-yolk–shell CuO (MYS-CuO) microspheres, b carbon-free MYS-CuO cathode (CuO: polytetrafluoroethylene (PTFE) = 6:2), and c Ketjen black (KB)-containing MYS-CuO cathode (CuO: KB: PTFE = 6:2:2) after immersion in the electrolyte. d Transmission electron microscopy (TEM), and e high-resolution TEM images of polyacrylonitrile (PAN)-coated MYS-CuO microspheres cyclized at 280 °C. f Fast Fourier transform pattern of the area enclosed by the red dashed square in e. g KB-and-PAN-containing MYS-CuO cathode cyclized at 280 °C (CuO: KB: PAN: PTFE = 6:2:1:1) after immersion in the electrolyte. h Schematic of the structural transformation of the active cathode materials: without carbon coating (top row), with carbon coating (bottom row), before immersion in the electrolyte (left column), and after immersion in the electrolyte (right column). The black and tan squares represent KB particles and MYS-CuO microspheres, respectively

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