Abstract:This study studied an alternative nonwoven prepared with high temperature resistant engineering plastic polyphenylene sulfide (PPS) as substrate, polymer electrolyte poly(vinylidene fluoride) (PVDF) and SiO2 nanoparticle as surface coating materials to construct heat resistant composite separator (denoted as PVDF@SiO2/PPS). The results demonstrate that compared with commercialized separator PP/PE/PP, PVDF@SiO2/PPS separator owns higher ionic conductivity and discharge capacity, which are mainly related to higher porosity, air permeability, improved electrolyte wettability and electrolyte uptake for the composite separator. Moreover, PPS nonwoven based composite separator is observed to give superior heat-resistance and maintain original dimension even after exposed at 250 ℃. Accordingly, employing PPS nonwoven to build separator will shed light on development of high safety and high power lithium ion battery.