Lithium ionic intercalation and conduction performance of flexible-lithiated-iron oxides films synthesized by low temperature-atmospheric pressure-plasma polymerization

The lithium ionic intercalation and conduction performance of flexible-organo-lithiated iron oxide (Li x FeO y C z ) films enhanced by addition of organo-lithium oxides (LiO y C z ) into organo-iron oxide (FeO y C z ) films by an atmospheric pressure plasma jet (APPJ) at various mixed concentrations of ferrocene [Fe(C 5 H 5 ) 2 ] and lithium tert-butoxide [(CH 3 ) 3 COLi] precursors are investigated. A rapid deposition of Li x FeO y C z films onto 40 Ω/square flexible polyethylene terephthalate (PET)/indium tin oxide (ITO) substrates at short exposed durations of 37–38 s with an APPJ has been reported. The APPJ-polymerized Li x FeO y C z films possess outstanding Li + ionic intercalation performance in a 1 M LiClO 4 -propylene carbonate electrolyte as characterized both by potential sweep and potential step in situ Li + ionic intercalation. The Li + ionic intercalated (deintercalated) charge of 7.73 (6.28) mC/cm 2 for FeO y C z films is advanced to 11.59 (11.22) mC/cm 2 for Li x FeO y C z films. The superior Li + ionic conduction performance of Li x FeO y C z films has been demonstrated by electrochemical impedance spectroscopy in the device of PET/ITO/NiO x /Li x FeO y C z /NiO x /ITO, while the Li + ionic conductivity of up to 793.0 × 10 −10 S/cm at 10% of lithium tert-butoxide precursor addition is accomplished.