TiO₂/P(VdF-HFP) [Poly(vinylidene fluoride-co-hexafluoropropane)] hybrid fiber microporous membranes were prepared by using an electrospinning technique. The surface morphology of the microporous membranes has been observed by SEM, and the porosity of the microporous membranes which was formed by super thin fibers bridged mutually was measured. After absorbed LiPF₆/EC-DMC-EMC [ethylene carbonate-dimethyl carbonate-ethyl methyl carbonate] electrolyte solution, the microporous membranes became gel polymer electrolytes. The ionic conductivity and lithium ion transference number of the gel polymer electrolytes were measured by electrochemical methods. The results show that the doped TiO₂ decreases the crystallinity of P(VdF-HFP) and improves the electrochemical performance of gel polymer electrolyte.

Key words: electrospun, microporous membrane, polymer electrolyte, conductivity, ion transference number