The present disclosure relates to a lithium-sulfur rechargeable battery containing a lithium metal anode, a sulfur-containing cathode, and an electrolyte containing an additive of the formula M-X, where M is a transition metal and X is an anion, and where the additive helps form a passivation layer on the lithium metal anode.
STATEMENT OF GOVERNMENT INTEREST
 This invention was made with government support under Grant no. DE-SC0005397 awarded by the Department of Energy. The government has certain rights in the invention.