Film-shaped sol–gel Li4Ti5O12 electrode for lithium-ion microbatteries

• Published in: Journal of power sources Vol. 205; pp. 491 - 494
• Main Authors: Mosa, J., Vélez, J.F., Lorite, I., Arconada, N., Aparicio, M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-05-2012; Elsevier
• Subjects: All-Solid-State; Applied sciences; Electrical engineering. Electrical power engineering; Electrodes; Ellipsometry; Exact sciences and technology; Grazing incidence; Li-ion microbatteries; Li4Ti5O12; Lithium; Materials; Microorganisms; Nanocrystalline materials; Rutile; Sol gel process; Sol–gel; Spinel; Titanium dioxide; All-Solid-State; Spinel; Sol–gel; Nanocrystalline materials; Li-ion microbatteries; Li4Ti5O12; Microanalysis; Lithium; Electrode material; Coatings; IV-VI compound; Electrochemical characteristic; O; Transparent thin film; Lithium Titanates; Ti; Li; Lithium ion; Nanocrystal; Gold; Cycling; Phase composition; Grazing incidence; Sol-gel; Microbattery; Coated material; Ellipsometry; Thickness; Silicon oxides; Sol gel process; Spinels; Titanium oxide
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2012.01.090

► Nanostructured Li4Ti5O12 thin film electrodes for Li-ion microbatteries were developed. ► Li4Ti5O12 thin films were produced by sol–gel method and dip-coating process. ► Composition Li/Ti=6/5 presents single face-centered cubic spinel phase Li4Ti5O12. ► Good galvanostatic cycling and very flat discharge–charge were obtained. ► Li4Ti5O12 thin films are potential anode materials for lithium-ion microbatteries.
Homogeneous and transparent film-shaped spinel Li4Ti5O12 electrodes on gold coated quartz were synthesized by sol–gel and a dipping procedure after thermal treatments at 700°C. The influence of the lithium precursor content on the phase composition, structure and electrochemical behavior of this material was studied. Spectral ellipsometry measurements and SEM-EDX analysis indicate an average thickness between 385 and 560nm. Rutile TiO2 is detected using grazing incidence X-ray analysis and Micro-Raman in compositions with a lower content of lithium. Good galvanostatic cycling and very flat discharge–charge profiles confirm the high purity of Li4Ti5O12 electrodes obtained with the higher lithium content composition.