Rechargeable lithium-ion batteries of today operate by an electrochemical process that involves intercalation reactions that warrants the use of electrode materials having very specific structures and properties. Further, they are limited to the insertion of one Li per 3D metal. One way to circumvent this intrinsic limitation and achieve higher capacities would be the use of electrode materials in which the metal-redox oxidation state could reversibly change by more than one unit. Through the discovery of conversion or displacement reactions, it is possible to reversibly change by more than one unit. Further, the need for materials with open structures or good electronic ionic conductivity is eliminated, thus leading to a new area in materials for lithium ion battery. In this paper, we present a review enlightens new reaction schemes and their potential impact on applications.

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This paper focuses on the dielectric constant (" 0 ), dielectric loss factor (" 00 ) and frequency dependent conductivity ( ac ) properties of newly prepared poly(vinylalcohol) (PVA) chitosan (CS) composite films incorporated with different concentrations of LiClO 4 . The composite films were prepared using solution casting technique. The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies. The sample containing 20 wt.% LiClO 4 exhibits a highest ionic conductivity of 3 Â 10 À6 S/cm at room temperature. The dielectric properties of the composites follow non-Debye behavior.

A novel polymer nano composite electrolyte composed of PVA polymer matrix with ZrO 2 ceramic filler and NaClO 4 salt was prepared by a solution casting. The characteristic properties of PVA/NaClO 4 polymer composite electrolytes with ZrO 2 filler were studied using FTIR, X-ray diffractometer (XRD), FESEM, DSC, AFM, AC impedance method, and cyclic voltammeter. The sample containing 3 wt% ZrO 2 exhibits good mechanical strength, high conductivity, high dielectric constant and good electrochemical response at room temperature. The conduction mechanism of the composite can be represented by the correlated barrier hopping (CBH) model and the obtained frequency dependent S parameter obeys Almond-West Universal power law. Using Williams-Landel-Ferry (WLF) and Vogel Fulcher Tamman (VTF) equations equivalence correlated the dynamic fragility (m) and activation energy (E g ) with T g of polymer composites. Transport parameters were calculated using Rice and Roth model. The cyclic voltamograms shows that the prepared films were Pseudo-capacitive in nature. POLYM. COMPOS., 00:000-000, 2016.

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