BATTERY SEPARATOR WITH IMPROVED OXIDATION STABILITY

摘要

The invention relates to a thermoplastic polymer-based battery separator, which contains a compound of formula R(OR<1>)n (COOM1/x)m. In said formula, R represents a non-aromatic hydrocarbon group comprising between 10 and 4,200 carbon atoms, which can be interrupted by oxygen atoms, R<1 >represents H, -(CH2)kCOOM1/x or - (CH2)k-SO3M1/x, whereby k stands for 1 or 2, M represents an alkali or earth alkaline metal ion, H<+> or NH4<+>, whereby not all variables of M are defined simultaneously as H<+>, n stands for 0 or 1, m stands for 0 or a whole number from 10 to 1,400 and x stands for 1 or 2. The ratio of oxygen atoms to carbon atoms in the compound according to the aforementioned formula ranges between 1:1.5 and 1:30 and n and m cannot simultaneously represent zero.