Effect of annealing temperatures on optical and electrochemical behavior of spinel LiMn2O4 as cathode materials for lithium-ion batteries applications

Multiple Chelation-Assisted Lithiation Improves the Performance of Phosphate-Modified LiNi0.8Co0.1Mn0.1O2

“…Tauc relation was used to calculate the optical bandgap: (αhν) m = A (hν-E g ), where hν is the incident photon energy (h is 4.1356 × 10 −15 eV s), power factor m equals 2 when the material has direct bandgap and 0.5 when indirect bandgap, α the absorption coefficient, A constant, E g semiconductor bandgap. Considering the direct gap of NCM cathode, 57 the E g can be calculated by extrapolating the straight part to the horizontal axis on the (αhν) 2 vs. hν diagram based on the Tauc model, 58,59 and the intersection gives a value of ∼3.52 to 3.33 eV for 0PA and 0.2PA respectively in Fig. 4e.…”