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.
The effect of the uptake of different salts in the morphology, polymer phase, thermal and mechanical
properties of the membrane was determined.
The electrolyte uptake ranged from 396% for the LiTFSI salt to 529% for the Mg(CF3SO3)2. It is observed
that ionic conductivity of the membrane is dependent of the anion size of the salts present in the
electrolyte solution. Independently of the electrolyte solution, high ionic conductivity is obtained. In
particular, the ionic conductivity for the LiTFSI salt increases from 0.32 to 1.2 mS/cm when the temperature is increased from room temperature to 100C.
The porous membranes immersed in different electrolyte solutions show good electrochemical stability as determined by cycle voltammetry. It is observed that anion size is very important parameter that
affects the uptake value and electric properties of the polymer electrolyte. It is concluded that the polymer electrolyte based on P(VDF-TrFE) porous membranes are adequate for battery separator applications.
Poly(vinylidene fluoride-co-trifluoroethylene), P(VDF-TrFE) solid polymer electrolytes were preparedusing porous membrane soaked in lithium tetrafluoroborate (LiBF4), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), magnesium triflate (Mg(CF3SO3)2) and sodium triflate (Na(CF3SO3)) electrolytesolution.The effect of the uptake of different salts in the morphology, polymer phase, thermal and mechanicalproperties of the membrane was determined.The electrolyte uptake ranged from 396% for the LiTFSI salt to 529% for the Mg(CF3SO3)2. It is observedthat ionic conductivity of the membrane is dependent of the anion size of the salts present in theelectrolyte solution. Independently of the electrolyte solution, high ionic conductivity is obtained. Inparticular, the ionic conductivity for the LiTFSI salt increases from 0.32 to 1.2 mS/cm when the temperature is increased from room temperature to 100C.The porous membranes immersed in different electrolyte solutions show good electrochemical stability as determined by cycle voltammetry. It is observed that anion size is very important parameter thataffects the uptake value and electric properties of the polymer electrolyte. It is concluded that the polymer electrolyte based on P(VDF-TrFE) porous membranes are adequate for battery separator applications.
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