Synthesis and structural studies of Mg doped LiNi_0.5Mn_0.5O₂cathode materials for lithium-ion batteries

Lithium-ion mobility in layered oxides Li2Ca1.5Nb3O10, Li2Ca1.5TaNb2O10 and Li2Ca1.5Ta2NbO10, enhanced by supercell formation

“…This gradual temperature-dependent decrease of Zʹ is due to the decline of energy barriers [51], a typical occurrence in materials of this class [51][52][53][54][55]. This is associated with the enhancement of conductivity across grain-boundaries [51,53,54], and is consistent with the observed negative temperature coefficient of resistance [51,53,54]. The plots of the imaginary component (Zʹʹ) vs angular frequency in Fig.…”

“…In all materials, this broad peak diminishes at higher temperatures. This observation further signifies a weak relaxation at low temperatures, confirming the temperature-dependence of relaxation processes in these compounds [51,53,54,56]. Furthermore, the peak appears at higher angular frequency region for more conductive compounds, indicat-ing greater mobility of immobile species and higher ion-hopping rates [52] Fig.…”

“…8 show a broad peak whose intensity changes systematically. The lower intensity of the peak in more conductive materials in this series suggests the presence of smaller numbers of nonmigratory charged species [51][52][53][54]. In all materials, this broad peak diminishes at higher temperatures.…”