Open AccessSol-gel synthesis and determination of optimal sintering conditions of the Li6.75La3Zr1.75Nb0.25O12 solid electrolyte
Author(s) -
E. A. Il’ina,
E. D. Lyalin,
Б. Д. Антонов,
А. А. Панкратов
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1347/1/012112
Subject(s) - electrolyte , materials science , lithium (medication) , fast ion conductor , conductivity , sintering , ionic conductivity , analytical chemistry (journal) , ion , ceramic , phase (matter) , electrochemistry , mineralogy , chemistry , metallurgy , electrode , chromatography , medicine , organic chemistry , endocrinology
Solid electrolytes are widely used in electrochemical devices. Among these materials, electrolytes with the lithium-ion conductivity can be used in high-energy lithium and lithium-ion power sources. The perspective Li 6.75 La 3 Zr 1.75 Nb 0.25 O 12 solid electrolyte was synthesized by modified sol-gel synthesis method using the sparingly soluble Nb 2 O 5 as one of the initial compounds. The influence of pressure and final sintering temperature on phase composition, density and lithium-ion conductivity was studied. Solid electrolyte obtained at 1150°C was single phase and had a cubic structure with the space group Ia-3d . Thus in the presented work, the cubic modification of Li 6.75 La 3 Zr 1.75 Nb 0.25 O 12 was obtained by thermal treatment for 1 h at 1150°C (versus 36 h at 1200°C in the literature). Moreover at this temperature the samples had the highest density and total lithium-ion conductivity (3.9·10 –5 Scm –1 at 25°C). According to the SEM study ceramic samples have a dense structure with a particle size ∼1-3 μm. Solid electrolyte was also obtained by isostatic pressing at a pressure of 500 MPa but the values of density and total lithium-ion conductivity were comparable with that of the samples compressed statically.