Mechanically robust polyacrylonitrile/alumina (PAN/Al2O3) composite membranes were fabricated by electro-spinning mixed solution of PAN and Al2O3 nanoparticles. The as-prepared composite membranes of a three-dimensional network based On uniform polymeric interconnected structures exhibit excellent mechanical properties along with high porosity (similar to 64%), high electrolyte uptake ( similar to 470%) and good relative absorption ratio (similar to 62% of the initial absorption). The introduced Al2O3 nanoparticles significantly improved the electrolyte compatibility, thermal properties and wettability of membranes. The fabricated PAN/Al2O3-triethylene glycol diacetate-2-propenoic acid butyl ester (PAN/Al2O3-TEGDA-BA) gel electrolytes via immersing membranes in TEGDA-BA show high ionic conductivity up to 2.35 x 10(-3) S cm(-1) at 25 degrees C, coupled with high electrochemical stability (>4.5 V vs. Li/Li+). The half-cells based on Li[Li1/6Ni1/4Mn7/12]O7/4F1/4 electrodes demonstrate remarkably stable charge/discharge performance and excellent capacity retention of similar to 240.4 mA h g(-1) (0.1 C) after 50 cycles with a cut-off voltage of 4.8 V. The results suggest a facile strategy for scalable fabrication of high-performance polymer electrolyte membranes in high-voltage lithium ion batteries. (C) 2015 Elsevier B.V. All rights reserved.