Summary In the recent decade, lithium‐ion batteries have flourished in the mobile market to a greater extent. Despite its versatile commercial applications in various fields, it faces critical issues that restrict by safety concerns including leakage, combusting, or even explosions because of the low boiling point of liquid organic electrolytes. In order to mitigate these difficulties, solid electrolytes can be a potential choice. Polymer‐based solid Li‐ion batteries have been attracting researchers for accomplishing high performance. However, poor mechanical strength and low transport of Li+ ions inside the cell remain prominent challenges for its commercialization. To solve these issues and enhance the overall performance, polymer‐based nanocomposite electrolytes developed by incorporating the nanofillers into the polymer matrix have been investigated to a greater extent. This review briefly elaborates on the recent progress of polymer nanocomposite electrolytes for lithium‐ion batteries, factors affecting its performance, and various models used in the interpretation of its performance.

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Electrospun pure polymer poly(vinylidene difluoride‐co‐hexafluoropropylene) [P(VDF‐HFP)] fibrous membrane (esPFM) and electrospun nanocomposite polymer [P(VDF‐HFP) + TiO2 nanofibers fillers (2, 4, 6, and 8 wt%)] fibrous membranes (esNCPFMs) were prepared using electrospinning technique. All the prepared fibrous membranes were soaked in an optimized electrolytes [0.1M of each LiI/NaI/KI/TBAI + 0.6M BMII + 0.05M I2 + 0.5M of tert‐butyl pyridine + (acetonitrile: (EC: PC) (1:1v/v)) (60:40)] solutions to obtain esPFM and esNCPFMs electrolytes and were characterized using differential scanning calorimetric (DSC), X‐ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscope (SEM) techniques. Also, an electrolyte uptake behavior and ionic conductivity of all the prepared esPFM and esNCPFMs electrolytes samples were studied, respectively, using the calculated electrolyte uptake data and the resistance evaluated from the analysis of measured impedance data of each sample. The electrospun nanocomposite polymer (PVDF‐HFP + 6 wt% TiO2 nanofibers fillers) fibrous membrane electrolyte with LiI showed highest conductivity of 1.87 × 10−2 S/cm at room temperature, which was very good, compared to the liquid electrolyte systems. Transference number studies showed that the charge transport in the highest conducting 6 wt% of TiO2 nanofibers fillers of the esNCPFM sample with LiI is predominantly due to ions and has negligible electronic contribution. Hence, the newly developed high ionic conducting electrospun nanocomposite polymer (PVDF‐HFP + 6 wt% TiO2 nanofibers fillers) fibrous membrane with LiI can be a better electrolyte for developing high‐efficiency dye‐sensitized solar cells (DSSCs) application. POLYM. COMPOS., 40:1585–1594, 2019. © 2018 Society of Plastics Engineers

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