화학공학소재연구정보센터
Solid State Ionics, Vol.289, 35-47, 2016
Characterization of semi-interpenetrating polymer electrolytes containing poly(vinylidene fluoride-co-hexafluoropropylene) and ether-modified polysiloxane
This work presents a detailed study of a semi-interpenetrating polymer network (semi-IPN) consisting of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), polysiloxane-comb-propyl(triethylene oxide) (PSx) and lithium bis(trifluoromethane)sulfonimide (LiTFSI) prepared by a solution casting technique. According to differential scanning calorimetry (DSC), formation of the PVDF-HFPs crystalline phase is inhibited by the PSx which results in a significant improvement of tensile strain. A homogeneous distribution of PVDF-HFP and PSx in the membrane is analyzed using micro-FTIR mapping. Since no peak-shift due to mixing of PVDF-HFP and PSx was observed in FTIR second derivative analysis, computational models were applied to investigate the intermolecular interactions between the constituting domains of different polarity. An influence of PVDF-HFP on the Li+ transport in the ion-conducting PSx was determined by calculating the effective conductivities. The highest ionic conductivity of 7.7 x 10(-5) S cm(-1) at room temperature was reached with 15 wt% LiTFSI. The electrochemical stability window ranges from 0.5 V to 4.6 V vs. Li/Li+ reference electrode. (C) 2016 Elsevier B.V. All rights reserved.