On the role of cyclic unsaturated additives on the behaviour of lithium metal electrodes in ionic liquid electrolytes

George Lane, Adam Best, Douglas Macfarlane, Maria Forsyth, Anthony Hollenkamp

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Three cyclic vinyl based additives, based respectively on oxygen, sulphur and fluorine, are tested for their ability to improve the cycling of lithium in a hostile ionic liquid medium. Oxygen based vinylene carbonate is found to offer the best protection of the lithium metal whilst allowing very consistent lithium cycling to occur. The vinylene carbonate based system under study is, however, imperfect. Lithium metal is deposited in a dendritic morphology, and vinylene carbonate is rapidly consumed during lithium cycling if it is present in a small quantity. Our results suggest that ionic liquid systems critically relying on a small amount of additive to protect a lithium electrode are not viable for long cycle life secondary batteries. It is suggested that an ionic liquid which itself is lithium metal compatible be used instead.
Original languageEnglish
Pages (from-to)2210 - 2215
Number of pages6
JournalElectrochimica Acta
Issue number6
Publication statusPublished - 2010

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