GALVANIC ELEMENT

摘要

The invention relates to a galvanic element comprising a negative electrode, which contains graphite-type carbons that are intercalated with lithium as an active material. In said element, the electrolyte only contains diethyl carbonate as the organic, aprotic solvent, lithium hexafluorophosphate as the supporting electrolyte, in addition to ethylene carbonate and between 0.2 and 5 wt. % vinylene carbonate. The fraction of vinylene carbonate preferably lies between 0.5 and 1.5 wt. % and the degree of crystallinity of the carbon material of the negative electrode is less than 80 %. The weight ratio of ethylene carbonate to diethyl carbonate is between 3 and 7. The electrolyte can also contain between 0.5 and 4 wt. % propane sultone and between 0.5 and 5 wt. % cyclohexyl benzole.