| abstract |
A lithium-sulfur battery includes a cathode, a lithium metal anode, and a separator interposed between the cathode and the anode. The separator contains less than two fluorine atoms per carbon atom to enable a protective layer to form on a surface of the lithium metal anode. The lithium-sulfur battery forms a uniform and dense LiF protective layer on the surface of the lithium metal and stabilizes the lithium metal during its operation. The lithium-sulfur battery prevents the formation of lithium dendrites and inhibits the decomposition of an electrolytic solution to provide improved cycle characteristics and excellent charging/discharging efficiency. In addition, the lithium-sulfur battery blocks the reaction of polysulfide with the surface of lithium metal to prevent a reduction of the lifetime of the battery. |