Citrated porous PVDF-co-HFP containing LiClO4eECeDEC is prepared with a preferential polymer
dissolution process using polyvinyl acetate to create a different porosity ratio of the optimized citrated
membrane. All citrated samples (3,5,7,9,11 wt. %) are characterized using X-ray diffraction to show that
the sample containing 7 wt. % citric acid has the lowest crystalline structure. The optimized sample is
mixed with different PVA concentrations, (4, 8, 12, 16 wt. %), and then all PVA removal copolymer
composite samples are immersed in a mixture of a liquid electrolyte containing LiClO4, EC, and DEC. The
swelling and porosity measurements show that the sample containing 16 wt. % of PVA removal has the
highest values, 68% porosity and 115% swelling. Scanning electron microscope is used to show the porous
structure of the optimized citrated copolymer electrolyte sample (16 wt. % of PVA removal) compared to
the before removing PVA one. DC-electrical conductivity measurement is performed to show the effect of
porosity on the conduction process. The sample having 8 wt. % PVA removal shows a high conductivity
value of 8 104 S cm1 compared to the other samples at room temperature. Complex impedance,
electrochemical stability and stressestrain curve are also studied. All results are collected and discussed. |
