Abstract: A method of producing a cross-linked polyacrylonitrile-sulfur composite material, in which polyacrylonitrile is reacted with sulfur and at least one cross-linking agent to form a cross-linked polyacrylonitrile-sulfur composite material and the cross-linking agent includes at least one functional group, selected independently of one another from an ethylenically unsaturated functional group, an epoxy group and a thiirane group. In addition, the invention relates to a polyacrylonitrile-sulfur composite material, a cathode material, an alkali metal-sulfur cell or an alkali metal-sulfur battery as well as to an energy store.

Abstract: An electrical energy store and a method for operating an electrical energy store are described. The electrical energy store includes: a housing; at least one energy storage element situated in the housing; and at least one gas-tight cavity, to which an internal pressure is applicable, situated in the housing, with the aid of which a pressure is exertable on at least one section of the energy storage element by applying the internal pressure to the cavity.

Abstract: A cathode material for an alkali metal/sulfur cell, which encompasses at least one sulfur-containing cathode active material and at least one transition metal sulfide and/or at least one metal sulfide of at least one metal of the third, fourth, and/or fifth main group. Also described is a cell and a battery equipped therewith.

Abstract: A battery electrode for battery cells is described, in particular, a cathode, having a contactor for establishing an electrical contact with an electrical conductor and an electrode-active material, the electrode-active material having a surface structuring.

Abstract: An electrochemical cell that includes a negative electrode, a positive electrode, a protective layer situated on the negative electrode, which separates the negative electrode from the positive electrode, and an electrolyte, the negative electrode at least partially including metallic lithium, and the protective layer situated on the negative electrode being formed of a composite material, including at least one first material and one second material. Also described is a corresponding method for manufacturing an electrochemical cell.

Abstract: A lithium-ion battery having an anode, a cathode, a separator, and an electrolyte connected to the anode and to the cathode, encompassing at least one lithium salt as an electrolyte salt and one solvent solubilizing the lithium salt, wherein the lithium-ion battery contains at least one cation exchanger that can release Li+ and bind H+, and that is in contact with the electrolyte. A method is also described for preventing the dissolution of metals out of a cathode of a lithium-ion battery and/or damage to an SEI layer of an anode of the lithium-ion battery, encompassing bringing an electrolyte of the lithium-ion battery into contact with at least one cation exchanger that can release Li+ and bind H+.

Abstract: An electrical energy store and a method for operating an electrical energy store are described. The electrical energy store includes: a housing; at least one energy storage element situated in the housing; and at least one gas-tight cavity, to which an internal pressure is applicable, situated in the housing, with the aid of which a pressure is exertable on at least one section of the energy storage element by applying the internal pressure to the cavity.

Abstract: An electrochemical energy store, e.g., a lithium-ion battery, includes a cell chamber, in which at least one anode, at least one cathode, and an electrolyte, which is situated between the anode and the cathode, are situated, the cell chamber being separated from the external surroundings by a housing, and at least one detection substance for the detection of a leak of the housing being situated in the cell chamber. The energy store configuration allows a leak of the energy store to be detected in a simple way.