fig12

Figure 12. (A) Preparation strategy, advantages and existing problems of P2/O3 composite phase. (B) Pre-evaluation of cation potential for the custom-developed materials and widely reported counterparts; (C) and (D) the corresponding structural sketches and phase formation energy characteristics of P2-type and O3-type Na_0.8Ni_0.23Fe_0.32Mn_0.45O₂. (E) TEM images of P2/O3 Na_0.8Ni_0.23Fe_0.32Mn_0.45O₂. (B-E) Reproduced with permission^[163]. Copyright 2025, Wiley-VCH GmbH. TEM: Transmission electron microscope.