Composite bodies used as separators in electrochemical cells

US6746803B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Stephan Bauer · Ostercappeln, DE
• Bernd Bronstert · Otterstadt, DE
• Helmut Möhwald · Annweiler am Trifels, DE

Key dates

• Filing date: Oct 9, 2001
• Grant date: Jun 8, 2004
• Expiry date: Oct 9, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49112
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A composite comprises at least one first layer which includes a composite comprising(a) from 1 to 99% by weight of a solid (I) with a primary particle size of from 5 nm to 100 &mgr;m or a mixture made from at least two solids,(b) from 99 to 1% by weight of a polymeric binder (II) obtainable by polymerizingb1) from 5 to 100% by weight, based on the binder (II), of a condensation product III made fromat least one compound IV which is capable of reacting with a carboxylic acid or with a sulfonic acid or with a derivative or with a mixture of two or more of these, andat least one mol per mole of compound IV of a carboxylic or sulfonic acid V which has at least one functional group capable of free-radical polymerization, or of a derivative of these or of a mixture of two or more of theseandb2) from 0 to 95% by weight, based on the binder (II), of another compound VII with an average molecular weight (number average) of at least 5000 having polyether segments in a main or side chain,where the at least one layer has been applied to at least one second layer comprising at least one conventional separator.