A gel polymer electrolyte based on Polyacrylonitrile/organic montmorillonite membrane exhibiting dense structure for lithium ion battery

Polyacrylonitrile (PAN)/organic montmorillonite (OMMT) membranes served as a host which is swelled using a liquid electrolyte of 1.0M LiPF6 in carbonate solvent for gel polymer electrolyte have been fabricated by non-solvent induced phase separation (NIPS) method. The OMMT fillers have affected the morphology, thermal stability, electrolyte uptake, ionic conductivity and electrochemical properties of PAN/OMMT membranes in different ways. The PAN/OMMT membrane exhibits high liquid uptake (375.5%), superior dimensional stability under 150°C for 15min and superior electrochemical stability up to 4.62V. Moreover, the gel polymer electrolyte based on PAN/OMMT membrane not only possesses lower polarization and interfacial resistance, but also effectively suppresses the formation of Li dendrites as reflected in the surface morphology of lithium anode after cycling test. The application of natural montmorillonite has been demonstrated by a coin cell using Li metal as counter electrode at 1C, resulting in the high capacity of 141mAhg−1 after 100cycles and high capacity retention of 95.9%. The possibility of PAN/OMMT membrane applied for the sustainable safety lithium ion battery can be realized. •A polyacrylonitrile/organic montmorillonite membrane for Li-ion battery is proposed.•Desirable characteristic for restraining lithium dendrite relies on dense structure.•The thermal stability of the membrane enhances with the addition of OMMT fillers.