Lithium lanthanum titanium oxide solid-state electrolyte by spark plasma sintering

• Published in: Journal of alloys and compounds Vol. 486; no. 1; pp. 871 - 875
• Main Authors: Mei, Ao, Jiang, Qing-Hui, Lin, Yuan-Hua, Nan, Ce-Wen
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 03.11.2009; Elsevier
• Subjects: Applied sciences; Ceramics; Condensed matter: structure, mechanical and thermal properties; Defects and impurities in crystals; microstructure; Density; Diffusion in solids; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrochemical conversion: primary and secondary batteries, fuel cells; Electrolytes; Exact sciences and technology; Grain and twin boundaries; Ionic conduction; Ionic conductivity; Lanthanum; Lithium; Lithium ion battery; Lithium lanthanum titanium oxide; Oxides; Physics; Sintering; Solid-state electrolyte; Spark plasma sintering; Structure of solids and liquids; crystallography; Theory of diffusion and ionic conduction in solids; Transport properties of condensed matter (nonelectronic); Ionic conduction; Lithium ion battery; Solid-state electrolyte; Spark plasma sintering; Lithium lanthanum titanium oxide; Scanning electron microscopy; X ray microscopy; High density; Ionic conductivity; Solid electrolyte; High temperature; Crystal defect; X ray diffraction; Oxide ceramics; Grain boundary; Lanthanum oxide; Lithium battery; Solid state; Fine grain structure; Lithium oxide; Microstructure; Titanium oxide; X-ray photoelectron spectra; Electrochemical impedance spectroscopy
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.07.091

Inorganic lithium solid-state electrolytes with advantage of safety are considered as the candidates to substitute the organic liquid electrolytes in lithium ion batteries. Sintering of these solid electrolytes always requires high-temperature and long time. In this paper, spark plasma sintering was employed to prepare lithium lanthanum titanium oxide solid-state electrolyte. X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy were preformed to characterize their microstructure and ionic conductivity. The results showed that fine-grained electrolytes with high relative density of about 98.5% were obtained by sintering the oxide ceramics at 1050 °C for only 3 min. The ionic conductivity increases as the ceramic density increases. Grain boundaries in oxide ceramics dominate the Li + transport.