Enhanced lithium-ion intercalation and conduction of transparent tantalum oxide films by lithium addition with an atmospheric pressure plasma jet

• Published in: Journal of solid state electrochemistry Vol. 20; no. 3; pp. 743 - 757
• Main Authors: Lin, Yung-Sen, Sung, Ping-Ju, Tsai, Tzung-Han, Hsieh, Ming-Ho, Chen, Hsiang, Lin, Chia-Feng, Kao, Chyuan Hauer
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2016
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Energy Storage; Original Paper; Physical Chemistry; Tantalum oxide; Atmospheric pressure plasma; PECVD; Lithium-ion intercalation; Ion conductor
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-015-3102-6

An investigation is conducted on enhancing lithium-ion intercalation and conduction performance of transparent organo tantalum oxide (TaO y C z ) films, by addition of lithium via a fast co-synthesis onto 40 Ω/□ flexible polyethylene terephthalate/indium tin oxide substrates at the short exposed durations of 33–34 s, using an atmospheric pressure plasma jet (APPJ) at various mixed concentrations of tantalum ethoxide [Ta(OC 2 H 5 ) 5 ] and lithium tert-butoxide [(CH 3 ) 3 COLi] precursors. Transparent organo-lithiated tantalum oxide (Li x TaO y C z ) films expose noteworthy Li + ion intercalation and conduction performance for 200 cycles of reversible Li + ion intercalation and deintercalation in a 1 M LiClO 4 -propylene carbonate electrolyte, by switching measurements with a potential sweep from −1.25 to 1.25 V at a scan rate of 50 mV/s and a potential step at −1.25 and 1.25 V, even after being bent 360° around a 2.5-cm diameter rod for 1000 cycles. The Li + ionic diffusion coefficient and conductivity of 6.2 × 10 −10  cm 2 /s and 6.0 × 10 −11  S/cm for TaO y C z films are greatly progressed of up to 9.6 × 10 −10  cm 2 /s and 7.8 × 10 −9  S/cm for Li x TaO y C z films by co-synthesis with an APPJ.