fig2

Figure 2. (A) Electronic band structure of LiCoO₂ cathode in a LIB (Li = 1, left), Li_0.5CoO₂ (Li = 0.5, middle) and CoO₂ (Li = 0, right). Copyright from Ref.^[11]. (B) Optimized structure and electron PDOS calculated by density functional theory for Ba_0.5Sr_0.5Fe_1-xSb_xO_3-δ(x = 0, left; x = 0.05, middle; x = 0.1, right) Copyright from Ref.^[21].