Abstract:
The present invention relates to a polymeric material that can be obtained by reaction of (A) at least one polyimide, selected from condensation products of (a) at least one polyisocyanate with an average of at least two isocyanate groups per molecule and (b) at least one polycarboxylic acid with at least 3 COOH groups per molecule or the anhydride thereof, (B) at least one diol or triol.
Abstract:
The invention relates to a method for producing membranes coated with a catalyst on both sides for electrochemical devices, with the following steps: A) producing a first semifinished product by applying a first ionomer layer onto a first support, applying an anode catalyst layer onto the first ionomer layer while using a first catalyst ink, and drying the anode catalyst layer; B) producing a second semifinished product by applying a second ionomer layer onto a second support, applying a cathode catalyst layer onto the second ionomer layer while using a second catalyst tint, and drying the cathode catalyst layer; C) removing the first and second supports from the first or second ionomer layer and, joining the first semifinished product to the second semifinished product by joining the first ionomer layer to the second ionomer layer.
Abstract:
The present invention relates to a solid composite for use in the cathode of a lithium- sulphur electric current producing cell wherein the solid composite comprises 1 to 75 wt.-% of expanded graphite, 25 to 99 wt.-% of sulphur, 0 to 50 wt.-% of one or more further conductive agents other than expanded graphite, and 0 to 50 wt.-% one or more binder, based on the total amount of the solid composite, a lithium-sulphur electric current producing cell comprising (i) a cathode comprising the solid composite, (ii) an anode and (iii) an electrolyte interposed between said cathode and said anode, and a process for preparing the solid composite comprising the steps (I) preparing a slurry comprising sulphur, expanded graphite, and optionally further components in a liquid medium by dispersing the sulphur, the expanded graphite, and optionally the further components in the liquid medium; (II) casting the slurry provided in step (I) on a substrate or placing the slurry provided in step (I) into a mold; and (III) removing some or all of the liquid medium from the slurry cast in step (I I) to form a solid composite.
Abstract:
The invention relates to an electric current producing cell comprising (a) a cathode, (b) a Li-based anode, and (c) at least one electrolyte interposed between said cathode and said anode wherein the at least one electrolyte (c) contains at least one spiro ammonium salt and to the use of spiro ammonium salts as additive for electrolytes in electric current producing cells.
Abstract:
Electrolyte materials for use in electrochemical cells, electrochemical cells comprising the same, and methods of making such materials and cells, are generally described. In some embodiments, the materials, processes, and uses described herein relate to electrochemical cells comprising sulfur and lithium such as, for example, lithium sulfur batteries. The electrolyte can comprise a polymeric material and, in some cases, an absorbed auxiliary material. For example, the electrolyte material can be capable of forming a gel, and the auxiliary material can comprise an electrolyte solvent. In some instances, the electrolyte material can comprise at least one organic (co)polymer selected from polyethersulfones, polyvinylalcohols (PVOH) and branched polyimides (HPI). The non-fluid material in the electrolyte, when configured for use, can, alone or in combination with the optional absorbed auxiliary material, have a yield strength greater than that of lithium metal, in some embodiments.
Abstract:
A process for preparing polymeric aromatic phosphonates and polymeric aromatic phosphonates preparable by the process according to the invention and mixtures which comprise these polymeric aromatic phosphonates and at least one further polymer, and also films, composite materials and membranes comprising these polymers or mixtures, the use of the inventive membranes in fuel cells or in separation technology, and fuel cells comprising the inventive membranes.
Abstract:
A composite which comprises at least one base body composed of nonwoven as component (A), at least one nanocomposite as component (B), at least one polyether or at least one polyether-comprising radical as component (C) and optionally a lithium salt as component (D) is provided. A process for producing the composite, its use in separators for electrochemical cells and compounds which can be used for producing nanocomposites (B) are also provided.
Abstract:
Electrochemical cell comprising (A) at least one anode as component (A), (B) at least one cathode as component (B), (C) at least one non-aqueous electrolyte as component (C), (D) at least one separator positioned between anode (A) and cathode (B), as component (D), characterized in that separator (D) is manufactured from at least one polyimide selected from branched condensation products of (a) at least one polycarboxylic acid having at least 3 COOH groups per molecule or an anhydride or ester thereof, and (b) and at least one compound, selected from (b1) at least one polyamine having on average more than two amino groups per molecule and (b2) at least one polyisocyanate having on average more than two isocyanate groups per molecule.
Abstract:
A Li-based anode for use in an electric current producing cell comprising at least one anode active Li-containing compound and (A) a composition located between the at least one Li-containing compound and the catholyte (c) used in the electric current producing cell, containing (B1) at least one ionic liquid, (B2) at least one polymer compatible with the at least one ionic liquid (B1), and (B3) optionally at least one lithium salt.