Poly(vinylidene fluoride-co-trifluoroethylene), P(VDF-TrFE) solid polymer electrolytes were prepared
using porous membrane soaked in lithium tetrafluoroborate (LiBF4), lithium bis(trifluoromethanesulfonyl)
imide (LiTFSI), magnesium triflate (Mg(CF3SO3)2) and sodium triflate (Na(CF3SO3)) electrolyte
solution