Article ID Journal Published Year Pages File Type
1295742 Solid State Ionics 2005 5 Pages PDF
Abstract

Al substituted Li1 + xAlxHf2 − x(PO4)3 (x = 0.0∼0.5) solid electrolytes were prepared by conventional sintering (CS) and spark plasma sintering (SPS), and the Li+ ion conductivity of the sintered pellets was examined using an impedance analyzer. All the samples exhibited a rhombohedral NASICON-type structure. SPS improved the densification compared to CS, and Al substitution further increased the sample density resulting in a maximum density of ∼90%. The Li+ ion conductivity increased in proportion to the sample density and the highest conductivity of 1.1 × 10− 4 Scm− 1 was found in the Li1.5Al0.5Hf1.5(PO4)3 SPS specimen, which is comparable to the best value reported elsewhere. The activation energy of the total conductivity (bulk + grain boundary) reduced from 0.39 to 0.28 eV with Al substitution. The enhanced conductivity was discussed in terms of the densification, bottleneck size, and lithium ion content.

Related Topics
Physical Sciences and Engineering Chemistry Electrochemistry
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