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Spark Plasma Sintering of LiTi 2 (PO 4 ) 3 ‐Based Solid Electrolytes
Author(s) -
Chang ChaeMyung,
Lee Young Il,
Hong SeongHyeon,
Park HyunMin
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00246.x
Subject(s) - spark plasma sintering , materials science , conductivity , sintering , analytical chemistry (journal) , electrolyte , ionic conductivity , ceramic , ion , lithium (medication) , grain boundary , fast ion conductor , pellets , mineralogy , microstructure , composite material , chemistry , chromatography , medicine , organic chemistry , electrode , endocrinology
Solid electrolytes, LiTi 2 (PO 4 ) 3 (LTP), Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP), and Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 2.9 (VO 4 ) 0.1 (LATPV), were prepared by conventional sintering (CS) and spark plasma sintering (SPS) methods, and the Li + ion conductivity of the sintered pellets was examined using an impedance analyzer. SPS remarkably improved the densification compared to CS and resulted in dense ceramics (95–97% of theoretical density) irrespective of the substituted ions. The highest conductivity of 2.6 × 10 −4 S/cm was found for the LATPV specimen sintered by spark plasma at 1100°C. LATP and LATPV exhibited an order of magnitude higher ionic conductivity than LTP in the specimens of similar densities. The results demonstrated that the enhanced conductivity in substituted LTP is not due to the enhanced densification alone. The other possible explanations are discussed in terms of bottleneck size, lithium content, and grain boundary characteristics.