Abstract
In this paper we have reported electrical and other physical properties of polyethylene oxide (PEO) - LiCF3SO3 polymer electrolytes embedded with 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid. The addition of the ionic liquid to PEO- LiCF3SO3 electrolyte increases the amorphous phase content considerably and decreases the glass transition temperature. The relative amounts of different ionic species present in these electrolytes have been determined. It is observed that the fraction of free anions increase with the increase of ionic liquid concentration, whereas the fraction for ion pairs and aggregates show a decreasing trend under the same condition. The ionic conductivity of the PEO- LiCF3SO3 polymer electrolyte embedded with ionic liquid is higher than that of the PEO- LiCF3SO3 electrolyte. The ionic conductivity shows a transition around 323 K. The ionic conductivity above 323 K exhibits Arrhenius behavior with an activation energy, which decreases with the increase of ionic liquid concentration. However, below 323 K the conductivity shows Vogel–Tamman–Fulcher (VTF) type behavior.
Highlights
Solid polymer electrolytes with considerable ionic conductivity have been the subject of many recent investigations because of their potential applications in solid state lithium ion rechargeable batteries.[1,2,3,4,5,6] Much attention has been paid to Li+ ion conducting polyethylene oxide (PEO) based electrolytes,[3,7,8,9,10] and the ionic conductivity is the key parameter for their performance
In this work we have studied a correlation of structure and ionic conductivity of PEO- LiCF3SO3 polymer electrolyte embedded with 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid
X-ray diffraction (XRD), Differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) data of ethyl-3-methylimidazolium trifluoromethanesulfonate (EMITf) ionic liquid doped PEO-LiTf composite electrolytes show that amorphous phase of PEO gradually increases with the increase of EMITf concentration
Summary
Solid polymer electrolytes with considerable ionic conductivity have been the subject of many recent investigations because of their potential applications in solid state lithium ion rechargeable batteries.[1,2,3,4,5,6] Much attention has been paid to Li+ ion conducting PEO based electrolytes,[3,7,8,9,10] and the ionic conductivity is the key parameter for their performance. The crystallinity of PEO below melting point reduces the overall polymer flexibility and offers a low ionic conductivity at ambient temperature, which restricts its application in rechargeable batteries. In polymer electrolytes these ionic liquids act as the supplier of additional charge carriers and play the role of plasticizers as well.[26]. To achieve high ionic conductivity the solid electrolytes should allow for high ionic mobility, controlled by the segmental motion of the polymer chain. The ionic conductivity is greatly affected by the nature of the ionic species present in a polymer electrolyte.[28,29,30] Neutral ion pairs or neutral multiplets (as they carry no charge) do not contribute to the conductivity and the number of carriers available for conduction is reduced. In this work we have studied a correlation of structure and ionic conductivity of PEO- LiCF3SO3 polymer electrolyte embedded with 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ionic liquid
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
