Open AccessSpark plasma sintering plus heat-treatment of Ta-doped Li7La3Zr2O12 solid electrolyte and its ionic conductivity
Author(s) -
Jiali Xue,
Kuibao Zhang,
Daimeng Chen,
Jianjun Zeng,
Baozhu Luo
Publication year - 2020
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ab7618
Subject(s) - materials science , spark plasma sintering , sintering , ionic conductivity , electrolyte , ceramic , grain size , grain growth , analytical chemistry (journal) , particle size , conductivity , doping , phase (matter) , chemical engineering , metallurgy , electrode , chemistry , chromatography , organic chemistry , engineering , optoelectronics
Ta-doped Li 7 La 3 Zr 2 O 12 (Ta-LLZO) solid electrolyte ceramics were synthesized by solid-state sintering, spark plasma sintering (SPS) and SPS plus heat-treatment (two-step method) using LiOH·H 2 O, La 2 O 3 , ZrO 2 and Ta 2 O 5 as the raw materials. The Ta-LLZO samples prepared from these three routes are all in cubic phase structure. However, the solid-state method results in Ta-LLZO samples with different particle sizes and porous morphology, while the samples prepared by SPS route contain fewer internal voids and smaller particle size. The two-step method not only retains the high compactness of SPS samples, but also the increment of grain size. The SEM results demonstrate that Ta-LLZO sintered by the two-step method shows optimal electrical properties. And the total ionic conductivity is 4.6 × 10 −3 S cm −1 at 150 °C and the activation energy is calculated to be 0.38 eV.