Thermal and impedance studies of poly(vinylidene chloride-co-acrylonitrile)-based gel polymer electrolyte

Abstract

Poly(vinylidene chloride-co-acrylonitrile)-based gel polymer electrolytes are obtained using solution casting technique. The ionic conductivity and thermal behavior of polymer electrolytes have been investigated as a function of wt% of ethylene carbonate (EC). The thermal decompositions of polymer electrolytes have been determined by thermogravimetry and differential thermal analysis in the temperature range between 30 and 800 C. All the polymer complexes can be operated upto 170 C. This range well includes the operating temperature range of the lithium polymer batteries incorporating these materials. Bulk resistance of the electrolyte from alternating current (AC) impedance analysis gives the optimal EC ratio as 80 wt% for maximum ionic conductivity.

Dielectric and thermal response of poly[(vinylidene chloride)-co -acrylonitrile]/poly(methyl methacrylate) blend membranes

“…As the temperature increases, the viscosity of the polymer complex reduces which permits both macroscopic flow of polymer and local segmental motion. The local segmental motion plays an important role in the ionic migration in polymer electrolytes . The semi‐random motion of local polymer segments will create new coordination sites for the Li + ions, while the old sites disappear.…”

“…The local segmental motion plays an important role in the ionic migration in polymer electrolytes. 10 The semi-random motion of local polymer segments will create new coordination sites for the Li + ions, while the old sites disappear. The ions jump from site to site either along the same chain or between chains; this process is mainly dependent on the structure of the local surroundings.…”

“…Until now, very few copolymers have been studied and reported . Hsu and Yeh and Tremblay and Prud'homme reported the miscibility of PMMA and poly[(vinylidene chloride)‐ co ‐acrylonitrile] (PVdC‐AN) also called Saran‐F.…”

Structural and Electrochemical Analysis of PMMA Based Gel Electrolyte Membranes

“…The basic concept of diffusion theory is that transport of the particles in a medium depends upon the formation of holes large enough for diffusive displacement. The statistical redistribution of the free volume results in hole formation and its probability is given by the exponential term of the diffusion coefficient [17]. The diffusion coefficient and ionic conductivity can be related by Nernst-Einstein relation.…”

Electrochemical analysis on poly(ethyl methacrylate)-based electrolyte membranes

“…The loss of approximately half of the chlorine atoms from the polymer chain also results in significant changes in the stability of polymer electrolyte. 21 It is obvious from the observation that all the films could be operated until 200 • C. Even though the polymer PVC has poor thermal stability, the gel polymer electrolyte resulting on blending with PEMA and plasticizer has enhanced thermal stability. It is found that the film containing EC + GBL combination exhibited maximum ionic conductivity and thermal stability up to 240 • C. The thermal stability is also satisfactory for this composition, even though maximum thermal stability is obtained for the film with plasticizer combination EC + PC and EC + DEC.…”