Investigations on ion transport properties of hot-press cast magnesium ion conducting Nano-Composite Polymer Electrolyte (NCPE) films: Effect of filler particle dispersal on room temperature conductivity

Investigations on ion transport properties of Mg2+-ion conducting Nano-Composite Polymer Electrolyte (NCPE) films: [80PEO: 20Mg (CF3SO3)2] + micro/nano sized particles of passive/active filler materials viz. SiO2, TiO2, MgO, have been reported. NCPE films have been cast by hot-press technique. Solid Polymer Electrolyte (SPE) composition: [80PEO: 20Mg (CF3SO3)2], identified as one of the high conducting films in an earlier study with room temperature conductivity (σrt) ∼2.77 × 10−6 S cm−1, has been used as Ist-phase host matrix and the filler particles as IInd-phase dispersoid. The effect of dispersal of different filler materials on conductivity of NCPE films has also been investigated. NCPE films exhibiting highest room temperature conductivity, referred to as Optimum Conducting Composition (OCC), has been identified from the filler particle dependent conductivity studies. The phase identification and materials characterizations on NCPE OCC film have been performed using XRD, SEM, FTIR and DSC techniques. The ion transport property has been characterized in terms of ionic conductivity (σ) and ionic transference number i.e. total (tion) and cation (Mg2+) transference number (t+). These ionic parameters have been determined experimentally using different ac/dc techniques. The temperature dependent conductivity measurements have also been carried out to compute activation energy (Ea) by least square linear fitting of Arrhenius plot: ‘log σ − 1/T’.

► Mg2+-ion conducting polymer electrolytes for the development of all-solid-state mini/micro electrochemical devices.
► Casting of polymeric electrolytes has done using novel hot-press technique.
► Complexation of salt/dispersion of filler particles in PEO help to increase degree of amorphousity in host polymer.
► Decrease in activation energy above melting points attributes to complete amorphous phase of PEO.
► Active nano filler has been relatively more effective for the ionic conductivity enhancement.