The present paper deals with the problem of coating the lithium anode for the lithium—iodine battery. It has been found that addition of anthracene to the commonly used poly(2-vinylpyridine) (P2VP) as coating material produces a positive effect on the discharge behavior of the battery. To interpret this influence modeling reactions outside the battery were carried out. As result it has been stated that at first lithium anthracene adducts are formed which react with P2VP to yield higher molecular products by coupling via the pyridine rings.