Figure 10.

Structural characterization and electrochemical performance analysis of NaNi_0.45−xMn_0.25Ti_0.3Co_xO₂ (NMTCo_x) cathode in SIBs. (a) SEM images of the NMTCo_0.05 sample demonstrating particle sizes of approximately 1–2 μm with a bead like morphology. (b) HRTEM image showing the morphology of the microparticle in greater detail. (c) XRD pattern of NMT samples with varying Co concentration (0, 0.05, 0.1) demonstrating the characteristic peaks, strong crystallinity and structural evolution. (d–i) Elemental maps of the microparticles with the constituent elements labeled. (j) Schematic representation of the steps in the synthesis process for the NMT samples. (k) Cyclic voltammetry curves of the NMTCo0.05 sample at progressively increasing scan rates (0.2–0.8 mV s⁻¹) with the characteristic redox peaks clearly visible. (l) Capacity retention and coulombic efficiency plots of the NMT cathodes over 180 cycles. Copyright 2019, American Chemical Society.