Effects of potassium iodide (KI) on crystallinity, thermal stability, and electrical properties of polymer blend electrolytes (PVC/PEO:KI)

Optimization of salt concentration and explanation of two peak percolation in blend solid polymer nanocomposite films

“…One sole advantage of blending approach is appropriate to control over the properties by varying the material composition and easiest means of preparation. Recently, many efforts have been devoted in enhancing the electrochemical and mechanical properties in blend solid polymers electrolytes (BSPE) membranes such as PEO-PAN, PVdF-PEO, PEO-PVdF, PVA-PEO, PEO-PEG, PVA-PVP, PVC-PEMA, PVC-PVdF, PEO-PVP, PEO-P(VdF-HFP) and PVC-PEO [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

A study of structural, electrical and electrochemical properties of PVdF-HFP gel polymer electrolyte films for magnesium ion battery applications

“…As a result of additional flexible amorphous surroundings getting trapped, the crystalline portion of PVdF-HFP complex would melt probably at lower temperatures. In addition, the intensity of endothermic melting event decreases and broadens with the addition of Mg(Tf) 2 salt and EMITf ionic liquid, suggesting a decrease in the crystallinity of the host polymer.The relative crystallinity of a polymer electrolyte (χ c ) may be calculated from its DSC curve based on the following equation with the assumption that the pristine PVdF-HFP polymer is 100% crystalline[23,24]…”

Free-standing Li+-conductive films based on PEO–PVDF blends

“…It should be noted that addition of salts suppresses PEO crystallinity. 7,8 Among various salts including LiClO 4 , LiBF 4 and LiCF 3 SO 3 the latter was found to make a positive impact on the ionic conductivity, 9 probably to the larger anion that introduce more disorder in PEO stacking. Lithium bis-(tri-uoromethanesulfonyl)imide (LiTFSI) was also shown to be benecial because of its low lattice energy and high dissociation constant providing higher ion concentration in SPE.…”

“…Numerous efforts have been undertaken to achieve a reasonable balance between the conductivity of amorphous PEO-based SPEs and mechanical properties of the lms. The most common approaches to suppress crystallization include cross-linking, 11,12 synthesis of comb-like SPEs 13 and block copolymers, 14,15 as well as preparation of polymer blends with PVP, 16 PMHS, 17 PVC, 7,8,18,19 PVDF and its copolymers 20,21 or adding ceramic llers and nanoparticles (e.g. TiO 2 , SiO 2 or Al 2 O 3 ) with Lewis acid properties.…”