Structural, impedance, dielectric and modulus analysis of LiNi 1-x-y-0.02 Mg 0.02 Co x Zn y O 2 cathode materials for lithium-ion batteries

Lithium‐Ion Mobility in Layered Oxide Li2(La0.75Li0.25)(Ta1.5Ti0.5)O7 Containing Lithium on both Intra and Inter‐Stack Positions

“…As shown here, the magnitude of Z′ in the low‐frequency region has an inverse relationship with temperature, while in the high frequency region, the data from different temperatures merge. This behavior is in agreement with the negative temperature coefficient of resistance, [42–44] and the decrease in energy barrier in grain boundaries [33,41–44] . As observed here, the Z′ values for Li 2 (La 0.75 Li 0.25 )(Ta 1.5 Ti 0.5 )O 7 are lower than those of Li 2 La(TaTi)O 7 , indicating the enhanced conductivity of the former material.…”

“…This behavior is in agreement with the negative temperature coefficient of resistance, [42][43][44] and the decrease in energy barrier in grain boundaries. [33,[41][42][43][44] As observed here, the Z' values for Li 2 (La 0.75 Li 0.25 )(Ta 1.5 Ti 0.5 )O 7 are The loss spectrum, namely the imaginary component of impedance (Z'') as a function of angular frequency, shows broad peaks which flatten out at higher temperature. [41][42][43][44] The existence of peaks of this nature is indicative of the presence of immobile charge carriers at lower temperature, [44] which become mobile with rise in temperature.…”

“…The shift of the peak to higher frequency also points to an increase in mobility of charge carriers [41] . The temperature‐dependent relaxation phenomena are further evident from the decrease in magnitude of Z′′ and disappearance of the peaks at higher temperature [42–44] . As shown in Figure 5, the Z′′ peak for Li 2 (La 0.75 Li 0.25 )(Ta 1.5 Ti 0.5 )O 7 has a smaller intensity than that of Li 2 La(TaTi)O 7 at the same temperature.…”

“…The loss spectrum, namely the imaginary component of impedance (Z′′) as a function of angular frequency, shows broad peaks which flatten out at higher temperature [41–44] . The existence of peaks of this nature is indicative of the presence of immobile charge carriers at lower temperature, [44] which become mobile with rise in temperature.…”

Electrical, Dielectric Property and Electrochemical Performances of Plasticized Silver Ion-Conducting Chitosan-Based Polymer Nanocomposites

“…On the other hand, a sharp rise for CSAG4, which is composed of the highest ratio of glycerol, was detected in the low-frequency regions and indicated the maximum ionic conductor. Moreover, it reflects the effect of ion movement conductors and polarization of charge carriers [44,45]. The ε and ε"increment with increasing plasticizer may be interrelated to the bond energy reduction due to a high value of ε for glycerol (ε = 42.5) [46].…”