UV-polymerized composite ionogels for Li-organic batteries

• Composite ionogels (CIGs) were fabricated via one-pot UV-polymerization. • PTMA was employed as an organic cathode. • Al 2 O 3 particles enhanced the ionic conductivity and improved the SEI leading to better stripping plating behavior together with promoted electrochemical performance in Li-organic batteries. In this work, we report novel ionogels produced via UV-induced free radical polymerization for lithium-organic cells. Before UV-polymerization for 75 min, the methacrylate- and methacrylamide-based monomers were mixed with a lithium salt-ionic liquid mixture and a photo-initiator. The thermal and electrochemical properties of these highly ionically conductive ionogels (0.9 mS cm -1 at 20°C) were improved with the incorporation of Al 2 O 3 particles. These composite ionogels show a significantly higher ionic conductivity (1.7 mS cm -1 at 20°C) and much lower overpotential in addition to a thinner and more even SEI. Moreover, they increased the cycling performance when utilized as electrolyte and separator in Li//PTMA cells.