skip to main content

Title: Reactions of halogen-pyridine systems

The combination of halogens (acceptors) with pyridine derivatives (donors) produces, initially, charge transfer complexes with conductivities useful as depolarizers in lithium-halogen power cell cathodes. The complex most often employed in pacemaker batteries is I/sub 2//P2VP. Pyridines and halogens undergo additional reactions of consequence to cell performance. Such side reactions include: Alkyl group substitution, ring coupling, polymer molecular weight degradation, olefin addition and ring substitution. Instrumental analysis of model systems and the commercial iodine/poly-2-vinylpyridine (I/sub 2//P2VP) system provided evidence for alkyl group substitution, coupling and molecular weight degradation. The addition reaction was inferred from the presence of the needed reactants and their facile reactivity. Halogenation of the pyridine ring was not found. Side reactions cause reduced cathode capacity. Hydrogen halides generated by such side reactions may cause corrosion, but may enhance conductivity properties. Deleterious pressure buidup or dimensional changes may result from side reactions occurring within sealed battery cans. 7 refs.
Authors:
;
Publication Date:
OSTI Identifier:
5423314
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proc. - Electrochem. Soc.; (United States); Journal Volume: 80-4
Research Org:
Medtronic Inc, Minneapolis, Minn, USA
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 62 RADIOLOGY AND NUCLEAR MEDICINE; CARDIAC PACEMAKERS; PRIMARY BATTERIES; CHEMICAL REACTIONS; HALOGENS; IONIC CONDUCTIVITY; LITHIUM; PYRIDINES; ALKALI METALS; AZINES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; HETEROCYCLIC COMPOUNDS; METALS; NONMETALS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHYSICAL PROPERTIES 250904* -- Energy Storage-- Batteries-- Other Applications; 550600 -- Medicine