Alkali-Chalkogen-Batterie mit geringer Selbstentladung und hoher Zyklenfestigkeit und Leistung

The invention relates to an alkali metal-chalcogen battery (hereinafter: battery), in particular a lithium-sulphur battery, which has a high capacity and cycle life and decreased self-discharge. The battery, compared with the prior art, has improved performance values. This is achieved by an ion-selective separator between cathode and anode, which separator is permeable to alkali metal ions, but is impermeable to polychalcogenide ions such as, e.g., polysulphide ions. Thus, firstly, the migration of polysulphide ions from the cathode to the anode is blocked and as a result the formation of dentritic structures on the anode is prevented. This effectively prevents the self-discharge of Li-S batteries and achieves a high capacity and cycle life. Secondly, the ion-selective separator can be made extremely thin, in such a manner that a marked increase in performance can thereby be achieved.