In situ ceramic fillers of electrospun thermoplastic polyurethane/poly(vinylidene fluoride) based gel polymer electrolytes for Li-ion batteries

摘要

Gel polymer electrolyte films based on thermoplastic polyurethane (TPU)/poly(vinylidene fluoride) (PVdF) with and without in situ ceramic fillers (SiO_2 and TiO_2) are prepared by electrospinning 9wt% polymer solution at room temperature. The electrospun TPU-PVdF blending membrane with 3% in situ TiO_2 shows a highest ionic conductivity of 4.8 ×10~(-3)Scm~1 with electrochemical stability up to 5.4 V versus Li~+/Li at room temperature and has a high tensile strength (8.7±0.3MPa) and % elongation at break (110.3 ±0.2). With the superior electrochemical and mechanical performance, it is very suitable for application in polymer lithium ion batteries.