Reactions of halogen-pyridine systems

Journal Article · Tue Jan 01 04:00:00 EST 1980 · Proc. - Electrochem. Soc.; (United States)

OSTI ID:5423314

Coury, A J; Cahalan, P T

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.

• Research Organization: Medtronic Inc, Minneapolis, Minn, USA
• OSTI ID: 5423314
• Journal Information: Proc. - Electrochem. Soc.; (United States), Journal Name: Proc. - Electrochem. Soc.; (United States) Vol. 80-4; ISSN PESOD
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250904* -- Energy Storage-- Batteries-- Other Applications
550600 -- Medicine
62 RADIOLOGY AND NUCLEAR MEDICINE
ALKALI METALS
AZINES
CARDIAC PACEMAKERS
CHEMICAL REACTIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HALOGENS
HETEROCYCLIC COMPOUNDS
IONIC CONDUCTIVITY
LITHIUM
METALS
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PRIMARY BATTERIES
PYRIDINES