Abstract: A battery system includes at least one lithium cell with an electrolyte having at least one polymer which is configured to be impregnated with an electrolyte fluid. In order to increase the capacity, the life and the safety of the battery system, the battery system further includes at least one electrolyte fluid metering device, by which at least one component of the electrolyte fluid can be supplied to the lithium cell and/or by which electrolyte fluid can be discharged from the lithium cell.

Abstract: An electrochemical cell including a folded electrode layer and a folded separator, a battery including the electrochemical cell, and methods of forming the electrochemical cell and battery are disclosed. The electrode layer is folded in a first direction and the separator is folded in a second direction, such that the first direction and second direction are orthogonal each other.

Abstract: A separator for an energy store. The separator may be used in a lithium-sulfur battery in particular. To achieve improved cycle stability, the separator has at least one first layer and at least one second layer, the at least one first layer containing a material having an affine property with respect to at least one active electrode material, and the at least one second layer containing a material having a repellent property with respect to at least one active electrode material. The at least one first layer and the at least one second layer may be situated directly adjacent to one another. Also described is an energy store including the separator.

Abstract: A secondary cell, in particular a lithium-sulfur cell, that encompasses a cathode having an electrochemically active cathode active material, an anode having an electrochemically active anode active material, and a liquid electrolyte, the cathode active material and/or anode active material changing, in the context of the charging or discharging operation, from a solid phase form into a liquid phase form that is soluble in the electrolyte. To increase the charging/discharging rate and cycle stability and to decrease overvoltages, the secondary cell encompasses at least one redox additive that is soluble in reduced form and oxidized form in the electrolyte and that is suitable for reacting with the phase-changing electrode active material in a redox reaction in such a way that the electrode active material is convertible from the solid phase form into the liquid phase form.

Abstract: In a method for preparing a cathode material for an alkali-sulfur cell, e.g., a lithium-sulfur cell, at least one polyacrilonitrile-sulfur composite material and elemental sulfur are mixed, in order to increase the voltage, the capacitance and the energy density.

Abstract: The invention relates to a method for preparing a polyacrylonitrile-sulfur composite material, in which, polyacrylonitrile is converted to cyclized polyacrylonitrile, and the cyclized polyacrylonitrile is reacted with sulfur to form a polyacrylonitrile-sulfur composite material. By a separation of the preparation method into two partial reactions, the reaction conditions are advantageously able to be optimized for the respective reactions and a cathode material is able to be provided for alkali-sulfur cells with improved electrochemical properties. In addition, the invention relates to a polyacrylonitrile-sulfur composite material, a cathode material, an alkali-sulfur cell or an alkali-sulfur battery as well as to an energy store.

Abstract: An electrode for an energy store, in particular for a lithium-ion battery. To achieve a particularly good and long-term stable capacitance, the electrode includes an active material, optionally a binder, optionally a conductive additive, and a sorption agent; intermediate stages of the active material arising during a charging and/or discharging procedure of the energy store may be immobilized by the sorption agent. Furthermore, also described is a method for manufacturing an electrode for an energy store, and the use of a sorption agent for manufacturing an electrode for an electrochemical energy store.

Abstract: A battery system includes: a battery which includes a sulfur-containing polymer cathode and an anode containing lithium and having an active surface area; and a pressure-exerting device configured to apply, at least during some periods of operation of the battery, anisotropic pressure to the battery, one component of the pressure being perpendicular to an active surface area of an anode of the battery.

Abstract: A cathode composition for an alkali-sulfur cell, e.g., a lithium-sulfur cell, includes, in addition to elementary sulfur, at least one material having covalently and/or conically bound sulfur, for example, a sulfur composite material, a sulfurous polymer, a metal sulfide, or a nonmetal sulfide.

Abstract: A method for producing a cathode material for a cathode of a galvanic cell, such as a lithium or natrium sulfur cell. In order to improve the electric and ionic conductivity, the sulfur accessibility and utilization, elemental sulfur, at least one electrically conductive component and a solvent or a solvent mixture are mixed in method step a), the elemental sulfur being completely dissolved in the solvent or in the solvent mixture, and the solvent or solvent mixture is removed in a method step b).

Abstract: In a method for producing an anode for a lithium cell, and/or a lithium cell as well as anodes and lithium cells of this type, to extend the service life of the lithium cell and to selectively form a first protective layer including electrolytic decomposition products, on an anode including metallic lithium, a first electrolyte is applied on the anode ex situ, i.e., prior to assembling the lithium cell to be produced. To stabilize the first protective layer, a second protective layer is applied in a subsequent method step.

Abstract: The invention relates to a method for determining an aging condition of a battery cell. The method has the following steps of a) providing a battery cell, b) recording an impedance spectrum of the battery cell, c) determining an evaluation quantity based on the measured impedance spectrum, and d) determining an aging condition of the battery cell based on a comparison of the evaluation quantity to a reference value.