Lithium intercalation and conduction in Fe-containing tantalum oxide films synthesized with an atmospheric pressure plasma jet
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Lithium ionic intercalation and conduction performance of tantalum oxides films improved by adding with iron oxides using an atmospheric pressure plasma jet (APPJ) is investigated. Precursors [tantalum ethoxide, Ta(OC2H5)5]2] and ferrocene [Fe(C5H5)2] vapors are carried by argon gas, mixed by oxygen gas and injected into air plasma torch for rapid synthesis of organo-tantalum-iron oxides (TaFexOyCz) films onto the polished stainless steel substrate at a short exposed-duration of 35 s. The APPJ-synthesized TaFexOyCz films possess the prominent Li+ ionic intercalation performance for 200 cycles of reversible Li+ ionic intercalation and deintercalation in a 1 mol/L LiClO4-propylene carbonate electrolyte by switching measurements with a potential sweep from − 1.25 to 1.25 V at a scan rate of 40 mV/s. After 200 cycles of reversible Li+ ionic intercalation and deintercalation, the Li+ ions intercalated and deintercalated charges are respectively increased from 2.41 and 1.91mC/cm2 for TaOyCz film to 5.69 and 5.23 mC/cm2 for TaFexOyCz film. The Li+ ionic conduction performance of TaOyCz film is highly enhanced from 5.76 × 10−11 to 1070 × 10−11 S/cm for TaFexOyCz film, while proven by electrochemical impedance spectroscopy in the devices of polyethylene terephthalate (PET)/indium tin oxide (ITO)/NiOx/TaOyCz/NiOx/ITO and PET/ITO/NiOx/TaFexOyCz/NiOx/ITO.
KeywordsTantalum oxide Iron oxide Lithium ionic intercalation Lithium ionic conduction Atmospheric pressure plasma
This study is supported by the Ministry of Science and Technology of the Republic of China (MOST105-2221-E-035-089and MOST106-2221-E-035-080-MY3).
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