fig9

Figure 9. (A) Structural characteristics of Na₂C₂O₄; (B) Electrochemical properties of Na₂C₂O₄ and its application as a cathode sodium compensator. Reproduced with permission, Copyright 2020^[63], Wiley-VCH; (C) Schematic illustration of the slurry spraying method to deposit Na₂O₂ sacrificial layer on the P2 electrode film and corresponding characterization of the resultant composite electrode; (D) Electrochemical properties of Na₂O₂ and its use as a cathode sodium compensator. Reproduced with permission, Copyright 2021^[187], American Chemical Society; (E) Schematic illustration of the treatment of P2-Na_0.85Li_0.12Ni_0.22Mn_0.66O₂ with acetic acid and the role of the as-formed AC-Na as sodium reservoir. Reproduced with permission, Copyright 2021^[188], American Chemical Society; (F) Schematic illustration of the preparation of Na₃PS₃O and Na₃PS₃O-cast P2-Na_0.66Ni_0.26Zn_0.07Mn_0.67O₂ electrode; (G) Electrochemical properties of Na₃PS₃O and its application as a sodium sacrificing additive. Reproduced with permission, Copyright 2022^[189], Elsevier B.V.