To obtain a kind of new material of lithium ion battery septum， with Lithium Tert- butoxide as the cat-alyst，a polymer electolyte of poly ( ethylene- co- vinyl alcohol) end- capped with lithium sulfonate ( EVOH- SO3 Li)is synthesized from poly( ethylene- co- vinyl alcohol) ( EVOH) and 1， 3- propane sultone， the EVOH- SO3 Li non- wov-en membrane is prepared by electrospinning technique． FT- IＲ was used to characterize the structure of ionicpolyme， and the SEM is utilized to characterize the features microcosmic of the non- woven． Ｒesults show that graftpolymer of EVOH- SO3 Li is synthesized successfully． The fiber diameter between 150 nm － 210 nm， microporous di-ameter reached the requirements lithium ion battery septum．