Cross-linked Electrospun Gel Polymer Electrolytes for Lithium-Ion Batteries

Lithium-ion batteries（LIBs） benefit from an effective electrolyte system design in both terms of their safety and energy storage capability.Herein,a series of precursor membranes with high porosity were produced using electrospinning technology by mixing PVDF and triblock copolymer（PS-PEO-PS）,resulting in a porous structure with good interconnections,which facilitates the absorbency of a large amount of electrolyte and further increases the ionic conductivity of gel polymer electrolytes（GPEs）.It has been demonstrated that post-cross-linking of the precursor membranes increa ses the rigidity of the nanofibers,which allows the polymer film to be dimensionally sta ble up to 260℃ while maintaining superior electrochemical properties.The obtained cross-linked GPEs（CGPEs） showed high ionic conductivity up to 4.53×10-3 S·cm-1.With the CGPE-25,the assembled Li/LiFeP04 half cells exhibited good rate capability and maintained a capacity of 99.4% and a coulombic efficiency of99.3% at 0.1 C.These results suggest that the combination of electrospinning technique and post-cross-linking is an effective method to construct polymer electrolytes with high thermal stability and steadily decent electrochemical performance,particularly useful for Lithium-ion battery applications that require high-temperature usage.