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Updated: Jun 24, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Positronium formation in aromatic polymer electrolytes for fuel cells
Abstract:
We measured the yield of positronium (Ps) in sulfonated aromatic proton conducting membranes for the polymer electrolyte fuel cell (PEFC) with and without -SO(2)- in their chemical structures by positron annihilation lifetime spectroscopy (PALS). It was observed that Ps formation is almost totally inhibited in the polymers without -SO(2)- such as sulfonated poly(ether ether ketone) (SPEEK). On the other hand Ps favorably forms in those with -SO(2)- as sulfonated polyether sulfone (SPES), which is due to the anti-inhibition effect of -SO(2)-. The high probability of Ps formation in these polymers enables the study of the free volume and the mechanism of gas permeation by PALS.
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