Free-standing, high Li-ion conducting hybrid PAN/PVdF/LiClO4/Li0.5La0.5TiO3 nanocomposite solid polymer electrolytes for all-solid-state batteries

The free-standing PAN/PVdF/LiClO4/Li0.5La0.5TiO3 nanocomposite solid polymer electrolytes have been prepared by solution casting technique. The thermal stability of composite solid polymer electrolytes is evaluated by TG/DSC analysis, which reveals that the filler incorporated composite samples exhibit high thermal stability up to 500 degrees C. The XRD analysis demonstrated that the Li0.5La0.5TiO3 nanoparticles significantly reduced the crystallinity of the hybrid PAN/PVdF/LiClO4 polymer films. The FTIR spectra of PAN/PVdF/LiClO4/Li0.5La0.5TiO3 composites show the vibrational band of -CN stretching, CF2 asymmetric stretching, and Ti-O-La stretching which confirmed the complexation between polymer host matrices and Li0.5La0.5TiO3 nanoparticles. The 10 wt% Li0.5La0.5TiO3 nanoparticles embedded PAN/PVdF/LiClO4 solid polymer electrolyte possessed an excellent ionic conductivity of 1.43 x 10(-3) S cm(-1) at room temperature, which is far better than the filler-free samples (similar to 10(-5) S cm(-1)). The incorporation of Li0.5La0.5TiO3 nanoparticles into the PAN/PVdF/LiClO4 polymer electrolyte improves the concentration of free mobile lithium ions and develops Li-ion conduction channels within the crystalline framework. The PAN/PVdF/LiClO4/Li0.5La0.5TiO3 (10 wt%) composite electrolyte exhibited high thermal stability, good discharge capacities of 122, 105, 94, and 80 mAh g(-1) at 0.1, 0.5, 1, and 2C rates, and good cycling stability.