Lithium Ion Mobility and Activation Energy for Lithium Ion Conduction in A-Site Deficient Perovskites La_1/3-<i>x</i>Li_3<i>x</i>TaO₃

Fast Lithium‐Ion Conducting Thin‐Film Electrolytes Integrated Directly on Flexible Substrates for High‐Power Solid‐State Batteries

“…[ 22 ] Virtually no difference was observed between samples with values of 3.93 ± 0.02 Å measured, similar to that expected for this stoichiometry. [ 8 ] To verify a clean interface between the oxide fi lm and copper substrate, a cross-sectional transmission electron microscopy (TEM) image and composition map is shown in Figure 3 a,b for the sample batched with 20% excess lithium. No "burn marks" were observed post imaging and identical spectral patterns, within counting statistics, after multivariate analysis (1200 s total dwell time) and a single spectrum (128 s total dwell time) allowable thermal budget and precludes the use of most crystalline oxide electrolytes.…”

“…This is consistent with the expected Li:La ratio dependence of lithium ion conductivity in these materials where the highest ionic conductivity has been observed for a Li 0.18 La 0.27 TaO 3 composition. [ 8 ] The impedance response of the nominally 20% excess lithium sample is shown in the lower impedance region, emphasizing the resistor-capacitor (RC) arc and transition to a blocking spur in Figure 4 b. The impedance response was modeled with LEVM software [ 23 ] with the fi tting circuit is shown in Figure 4 b. Briefl y, a single ZARC element (resistor in parallel with a constant phase element) was used to fi t the high-frequency arc and a constant phase element was used to fi t the low frequency spur.…”

“…Lanthanum lithium tantalate perovskites offer the possibility of room temperature ionic conductivities up to 10 − 4 S cm − 1 with a valence stable B -site cation, tantalum. [7][8][9][10] Thin fi lms of La 1/3− x Li 3 x TaO 3 ( x = 0.06) have been prepared via a sol-gel method on SiO 2 and single-crystalline SrTiO 3 substrates, but required processing to temperatures in excess of 900 ° C and oxidizing atmospheres to realize high conductivities. [ 11 ] While successful in achieving the appropriate phase and high ionic conductivities, the use of these insulating, refractory, and expensive substrates limits commercial viability and the potential range of applications.…”

On the Power Law Behavior of the A.C. Conductivity in Li Ion Conducting Perovskites

“…Except for 6 / 1 x , the ratio n A / ) (log approaches the same value of 12 at higher temperatures, independently of the composition. A decade ago 18) , it has been found that the lithium ion conductivity at room temperature in La 1/3-x Li 3x TaO 3 is mainly governed by the lithium ion mobility. Furthermore, the Arrhenius plot of the lithium ion conductivity has been found to exhibit a common value of 10 S·cm -1 ·K for all the compositions at higher temperatures ( 666 K), except for 6 / 1 x 18) .…”

“…The choice of La 1/3-x Li 3x TaO 3 perovskite is not hazardous insofar as, on the one hand, over the imperious need to understand the transport mechanism in fast lithium conducting perovskites, this class of materials has not been considered in the previous analyses 15,16) . On the other hand, the experimental data needed are available 17,18) .…”