High performance electrospun Li+ functionalized sulfonated poly(ether ether ketone)/PVA based nanocomposite gel polymer electrolyte for solid state electric double layer capacitors.
The synthesis of a nanocomposite gel polymer electrolytes (NGPEs) using Li+ functionalized SPEEK (SPEEK(Li) nanofiber membrane as a matrix, cross linked PVA as a gelled agent and LiClO4 as an electrolytic salt for electric double layer capacitors (EDLCs) were reported in this work. Compared with conventional PVA based gel electrolyte, the "SO3 Li+" functional groups and the pores structure of the SPEEK(Li) nanofiber membrane improves the ionic conductivity as well as mechanical stability, which made the prepared NGPEs exhibited a high ionic conductivity of 8.9 x 10 3 S cm 1 at ambient temperature and a large voltage stability window range from 0 to 2.0 V. The fabricated symmetric EDLCs showed a specific capacitance of 146.96 F g 1 at a current density of 0.5 A g 1, with a maximum energy density of 18.26 W h kg 1. Meanwhile, the EDLCs showed outstanding cyclical stability of 98% specific capacitance retention after 3000 cycles GCD testing, all of these results indicated that the NGPEs should be appropriate to EDLCs and next generation energy storage systems.
Journal of colloid and interface science