Study of a novel porous gel polymer electrolyte based on TPU/PVdF by electrospinning technique

摘要

Investigation on a new electrospun gel polymer electrolyte consisting of thermoplastic polyurethane (TPU) and poly(vinylidene fluoride) (PVdF) has been made. Its characteristics were investigated by scanning electron microscopy, FT-IR, Differential Scanning Calorimeter (DSC) analysis. This kind of gel polymer electrolyte had a high ionic conductivity about 3.2 × 10~(- 3) S cm~(- 1) at room temperature, and exhibited a high electrochemical stability up to 5.0 V versus Li~+/Li, good mechanical strength and stability to allow safe operation in rechargeable lithium-ion polymer batteries. A Li/GPE/LiFePO_4 cell delivered a high discharge capacity when it was evaluated at 0.1 °C-rate at 25 °C (167.8 mAh g~(- 1)). And a very stable cycle performance also existed under this low current density.