Lithium Ion Conductivity of the B-site Substitution in Li_3xLa_(0.67-x)RE~III_yTi_(1_2y)P_yO_3 System(RE~III = Sc~(3+),Y~(3+),Nd~(3+),Sm~(3+),Eu~(3+),Yb~(3+))

摘要

The B-site substituted perovskite solid solution systems Li_3xLa_(0.67-x)RE_yTi_(1-2y)P_yO_3(RE = Sc,Y,Nd,Sm,Eu,Yb)have been investigated.Perovskite solid solutions formed in the range of x = 0.10,y < 0.10 for RE = Sc~(3+),Y~(3+),Yb~(3+),x = 0.10,y <= 0.05 for RE = Nd~(3+),Sm~(3+),Eu~(3+).Li_0.3La_0.57Nd_0.05Ti_0.9P_0.05O_3 has the highest bulk conductivity of 4.31 x 10~(-4)S centre dot cm~(-1)and the highest total conductivity of 2.52 x 10~(-4)S centre dot cm~(-1)at room temperature in all prepared compositions.The compositions have low activation energies of about 24-30 kJ/mol in the temperature ranges of 298-523 K.SEM studies showed that the sample made by solid-state reaction has a sphere-like morphology and a rough particle with particle size of about 50 mum.The research results also indicated that the reaction temperature decreases and the electrochemical stabilities of the titanate-based perovskite-type solid solutions are improved by using RE~(3+)and P~(5+)replaced Ti~(4+)on B-site in the Li_3xLa_(0.67-x)TiO_3 parent.