期刊
MATERIALS RESEARCH EXPRESS
卷 7, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/ab7618
关键词
solid electrolyte; Li7La3Zr2O12; ionic conductivity; SPS; microstructure
资金
- Project of State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology) [G201908]
- Project of State Key Laboratory of Environment-friendly Energy Materials (Southwest University of Science and Technology) [18fksy0214]
- Key R&D Program for Civil-Military Integratio of Sichuan province [2018GZ0519]
- Science Development Foundation of China Academy of Engineering Physics
Ta-doped Li7La3Zr2O12 (Ta-LLZO) solid electrolyte ceramics were synthesized by solid-state sintering, spark plasma sintering (SPS) and SPS plus heat-treatment (two-step method) using LiOHH2O, La2O3, ZrO2 and Ta2O5 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 x 10(-3) S cm(-1) at 150 degrees C and the activation energy is calculated to be 0.38 eV.
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