fig6

Figure 6. (A) Electrochemical performance between Na_2/3(Mn_0.54Ni_0.13Co_0.13)O₂ and other cathode materials for sodium-ion batteries (Reproduced with permission from Ref.^[92]. Copyright 2019, Elsevier); (B) The structure of Na₂SiO₃; Schematic illustration of the synthesis process for Na₂SiO₃@NaNi_1/3Mn_1/3Fe_1/3O₂ (Reproduced with permission from Ref.^[93]. Copyright 2019, John Wiley and Sons); (C) HRTEM images of NNMO@ZnO sample (Reproduced with permission from Ref.^[94]. Copyright 2019, Elsevier); (D) Schematic diagram of MgO-coated NM cathodes (Reproduced with permission from Ref.^[95]. Copyright 2022, Frontiers); (E) Microscopic analysis of the Al₂O₃ coated Na[Ni_0.6Co_0.2Mn_0.2]O₂ particle: bright field TEM image (inset image: TEM image of Al₂O₃ nanoparticles), cross-sectional SEM image, and cross-sectional TEM image (Reproduced with permission from Ref.^[96]. Copyright 2013, Royal Society of Chemistry).