preparation of high temperature enhanced dimensional stability membranes for lithium-ion battery separator

Abstractpvdf membranes were prepared by non-solvent induced phase inversion method with enhanced dimensional stability at high temperatures for application as lithium ion battery's (libs) separator# effects of the polymer molecular weight (1#100#000, 352#000 gr/mol), solvent type (nmp, dmf) and coagulation bath temperature (cbt, 20, 30 °c) were studied# the results showed that the separators prepared by high molecular weight polymer, nmp as solvent and coagulation bath temperature of 20 °c have higher dimensional stability at 165 °c# this best prepared separator's (s4) thermal shrinkage was the lowest (27 %) among all the prepared separators# battery performance was determined by assembling li/lifepo4 half - cell (2032 type coin)# the cycle performance of cell assembled by enhanced pvdf membrane were higher ( 97#8 % reduction after 25 cycles) compared with that of assembled by commercial pp separator (96#4 % after 25 cylces)#