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Received Sep 29, 2017; Revised Nov 13, 2017; Accepted Dec 14, 2017
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1. Introduction
Over the past few decades, batteries are a primary source for high energy density. They play an important role in energy storage device applications [1, 2]. Blend polymer electrolytes with complex nature of organic or inorganic salts have been analyzed to prepare energy devices, as they have potential and electrochemical properties [3]. These can be used in many industrial and energy storage device applications such as solid state batteries, fuel cells, and electrochromic display devices/smart windows [4, 5]. One of the main objectives is to develop the blend polymer systems with enhanced ionic conductivity. There are several strategies in solid polymer electrolyte (SPE) systems to suppress the crystalline nature. Polymers can be classified in to subgroups like block copolymers [6, 7], polymer blends [8, 9], cross-linked polymer networks [10, 11], and comb-branched copolymers [12–15]. Blend polymer electrolytes were used in the fabrication of electrochemical cells and thin film solid state batteries. Due to low negligible hazards magnesium rechargeable batteries are used now a days in many applications such as microbatteries and energy storage devices. They can be operated safely at room temperature [16, 17].
Blending of polymers is one of the promising methods which are used in wide variety of applications such as energy storage devices, electrochemical cells, fuel cells, and humidity sensors, to attain high ionic conductivity. In recent years, research on blending of polymers has given a fascinating change in the pharmaceutical and industrial practice due to their desired properties. Blending of polymers with suitable organic and inorganic salt can give better improvement in ionic conductivity which can lead to the same order of ionic conductivity for the salt doped single polymer. However, their ionic conductivity is usually limited by segmental mobility and concentration of charged carriers. Some of the plasticizers such as propylene carbonate (PC) and ethylene carbonate (EC) and inorganic nanofillers have been incorporated into the polymer blend electrolytes to increase the flexibility or plasticity of the polymers as well as to enhance the ionic conductivity to...