Mechanically resilient polymeric films doped with a lithium...

Details Mechanically resilient polymeric films doped with a lithium... Mechanically resilient polymeric films doped with a lithium...

2005-02-15

2005-02-15

Woodward, Ana (Department: 1711)

Stock material or miscellaneous articles

Composite

Of polyimide

C428S689000, C525S436000, C528S338000

Reexamination Certificate

active

06855433

ABSTRACT:
This invention is a series of mechanically resilient polymeric films, comprising rod-coil block polyimide copolymers, which are doped with a lithium compound providing lithium ion conductivity, that are easy to fabricate into mechanically resilient films with acceptable ionic or protonic conductivity at a variety of temperatures. The copolymers consists of short-rigid polyimide rod segments alternating with polyether coil segments. The rods and coil segments can be linear, branched or mixtures of linear and branched segments. The highly incompatible rods and coil segments phase separate, providing nanoscale channels for ion conduction. The polyimide segments provide dimensional and mechanical stability and can be functionalized in a number of ways to provide specialized functions for a given application. These rod-coil black polyimide copolymers are particularly useful in the preparation of ion conductive membranes for use in the manufacture of fuel cells and lithium based polymer batteries.

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Katsuya Asao and Motonori Mitoh, Polyimides (containing ether linkages; Adhesive Properties), in Concise Polymeric Materials Encyclopedia, 1202 (Joseph C. Salamone ed., CRC Press 1999).

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