Synthesis of a Mesomorphic, Columnar, Porphyrin for Fast Li Ion Conducting Electrolytes
Abstract
Most polymer electrolytes, which are usually oxygen-containing systems, rely on polymer segmental motion for ionic conduction. In general, ionic conduction in these electrolytes at ambient temperatures is poor. We proposed, in cooperation with Dr. Larry Scanlon and coworkers, to build and study a single ion conduction channel for lithium ions that eliminates the need for polymer segmental motion for ionic conduction. The basis of this design is to maintain a constant solvation sphere for the lithium ion within the channel and obtain a new class of polymer with a very low activation energy over a broad temperature range. In order to fabricate a single ion conducting channel for lithium ions, it is necessary to design a hollow tubular supermolecular structure by organization of the molecules into column stacks along the short axis of the molecules. There are a number of examples of macrocyclic molecules that are good candidates for this purpose. Our original proposal focused on the functionalization of porphyrins to obtain liquid crystalline materials. The first generation of these materials has been synthesized and is currently under investigation in collaboration with Dr. Scanlon at Wright Patterson AFB.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 30, 2000
- Accession Number
- ADA384085
Entities
People
- John Arnold
Organizations
- University of California, Berkeley