Abstract
An enhancement of lithium ionic intercalation and conduction performance of lithiated-organo-iron-tantalum oxide (LiαFeTaxOyCz) films has been accomplished by the addition of organo-lithium oxides (LiOyCz) into organo-iron-tantalum oxide (FeTaxOyCz) films using an atmospheric pressure plasma jet (APPJ) at various mixed concentrations of lithium tert-butoxide [(CH3)3COLi] and tantalum ethoxide [Ta(OC2O5)5] precursors. The rapid deposition of LiαFeTaxOyCz films onto polished stainless steel substrates at short exposed durations of 38–41 s with an APPJ has been investigated. The APPJ-polymerized LiαFeTaxOyCz films have noticeable Li+ ionic intercalation/deintercalation performance at 200 reversible cycles in a 1-M LiClO4-propylene carbonate electrolyte as analyzed by both potential sweep and potential step in situ Li+ ionic intercalation. The Li+ ion intercalated and deintercalated charges are significantly improved from 5.70 and 5.20 mC/cm2 for FeTaxOyCz film to 8.11 and 7.51 mC/cm2 for LiαFeTaxOyCz films, respectively. The Li+ ionic conduction performance of FeTaxOyCz film is slightly enhanced from 107 × 10−10 to 118 × 10−10 S/cm for LiαFeTaxOyCzfilm, as verified by electrochemical impedance spectroscopy in the devices of polyethylene terephthalate (PET)/indium tin oxide (ITO)/NiOx/FeTaxOyCz/NiOx/ITO and PET/ITO/NiOx/LiαFeTaxOyCz/NiOx/ITO.
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