Ionically conductive thin polymer films prepared by plasma polymerization, part 9: Vapor‐phase preparation of solid polymer electrolytes composed of plasma polymer and lithium trifluoromethanesulfonate

Abstract

Solid polymer electrolytes composed of plasma-polymerized dimethyl-2-1(2-ethoxy-ethoxy)ethoxy1vinylsilaneand thermal vapor-deposited lithium trifluoromethanesulfonate have been prepared, and characterized using electron spectroscopy for chemical analysis (ESCA), Fourier transformlinfrared spectroscopy (FTIR), scanning electron microscopy (SEM) and electrochemical techniques. The obtained solid polymer electrolyte films of about 1 ,urn thickness were uniform and pinhole-free. Room temperature conductivity of 8 X S/cm has been observed. This value depends on the substrate temperature during the plasma polymerization, and the variation of the ionic conductivity with temperature can be described by using a Williams-Landel-Ferry equation.

Plasma Enabled Synthesis and Processing of Materials for Lithium‐Ion Batteries

“…143 Different composites were also investigated to find the effect of different functional groups introduced via the introduction of different monomers. 43 The effect of the RF power of the plasma and substrate temperature was studied by Ogumi et al, where they conducted their study on plasma-polymerized dimethyl -2-[(2-ethoxyethoxy) ethoxy] vinylsilane and thermal vapor-deposited lithium trifluoromethanesulfonate 144 . During plasma polymerisation at a high RF power plasma state, polymerisation will be dominant, whereas at a low power plasma, induced polymerisation will be preferred.…”

“…Low power plasma and moderate temperature processing of a polymer -lithium salt composite can produce better solid state electrolytes with better ionic conductivity and enhanced wettability. 144 During the charge discharge process the polarization of electrolytes can be reduced by an improved lithium transference number 145 . This high transference number can be achieved by reducing the mobility of anions in the electrolyte.…”