Investigation of structural and conductivity properties of poly(vinyl alcohol)-based electrospun composite polymer blend electrolyte membranes for battery applications

In the present study, we have made an attempt to prepare complexed PVA-PVP-KNO3-BaTiO3 blend composite polymer electrolyte membranes composed of potassium nitrate (KNO3) as salt and BaTiO3 of various concentrations as filler and studied their properties. The advantages of addition the fillers are the increase in ionic conductivity at room temperatures and the improvement of the stability at the interface with electrodes.
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Investigation of structural and conductivity properties of poly(vinyl alcohol)-based electrospun composite polymer blend electrolyte membranes for battery applicationsCite this paper: Vietnam J. Chem., 2023, 61(2), 158-169 Research articleDOI: 10.1002/vjch.202100050 Investigation of structural and conductivity properties of poly(vinyl alcohol)-based electrospun composite polymer blend electrolyte membranes for battery applications Rahmat Gul*, Wan Ahmad Kamil Mahmood School of Chemical Sciences, University Sains Malaysia, 11800 Minden, Pulau Penang, Malaysia Submitted May 24, 2021; Revised June 17, 2022; Accepted October 4, 2022Abstract Solid polymer electrolyte has attracted great interest for the next generation of electrochemical devices such asbatteries, but the low ionic conductivity and poor stability has retarded their commercial acceptance for energy storagedevices applications. To overcome these issues, strategies to develop composite polymer electrolytes (CPEs) aredrawing interest. Nanocomposite solid polymer blend electrolyte membranes based on poly (vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP) of various compositions that contained potassium nitrate (KNO 3) as a dopant salt, andBarium Titanate (BaTiO3) as a filler were prepared with various concentrations of filler using electrospinningtechnique. The structural and complex formations due to interaction of various groups of the prepared compositepolymer electrolyte membranes were investigated using X-ray diffraction (XRD) and Fourier transform infra-red(FTIR) spectral analysis. The conductivity of the PVA-PVP-KNO3-BaTiO3 polymer electrolyte systems was found tovary between 3.7110-9 and 1.9910-5 S cm-1 at 298 K with the increase in filler concentration. The maximum roomtemperature ionic conductivity (1.9910-5 S cm-1) has been obtained for 9 wt% BaTiO3 doped polymer electrolytesystem. The addition of filler also enhanced the thermal stability of the electrolyte. The temperature dependence ionicconductivity of the prepared complexed polymer electrolyte systems appears to obey Arrhenius behaviour. Keywords. Composite polymer electrolyte, ionic conductivity, nanofiber membrane, electrospinning, inorganicfiller.1. INTRODUCTION temperature and remain chemically unreactive. The addition of inert metal oxide filler that may act asDevelopment of new solid polymer electrolyte system solid plasticizers generally improves the transporthas been an important area of research which properties of polymer electrolytes and interfacialattracted attention for more than three decades, to find stability of the electrode-electrolyte interface. Suchnew types of electrolyte for fundamental knowledge enhancement in conductivity can be explained byand for their potential practical applications in various decrease in degree of crystallinity of the polymersolid state electrochemical devices.[1-8] Recently matrix.[13] The increase in ionic conductivity ofextensive investigations on such solid polymer composite solid electrolytes by incorporation of metalelectrolytes (SPE) have been in progress. Various oxide fillers associated with concentration andadvantages are realized by using a thin membrane of particle size of the inert filler. The enhancement insolid polymer electrolytes in place of a conventional ionic conductivity may be due to the development ofliquid electrolyte in electrochemical devices. Polymer a new kinetic path through a thin interface layer.[14-20]electrolyte materials exhibits high ionic conductivity, Polymer electrolytes were prepared with variousgood mechanical properties, ease of fabrication, metal oxides as fillers such as Al2O3, TiO2, ZrO2,compatibility with electrode material, and wide SiO2, and BaTiO3 which display high ionicelectrochemical stability. Addition of small size conductivity values with good mechanical andinorganic metal oxide additives in polymer electrolyte thermal stability at room temperature. The additionsystems is used to improve the morphological, of a small amount of inert filler causes remarkablemechanical and electrochemical properties of ionic conductivity in the composite complexedpolymer electrolytes.[9-12] Inorganic metal oxide polymer electrolyte systems. Therefore size andmaterials are mostly stable up to very high concentration o ...