FLOW-THROUGH REDOX ELEMENT FOR ELECTRIC POWER ACCUMULATION AND ITS APPLICATION Russian patent published in 2020 - IPC H01M8/18 

FIELD: electrochemistry.

SUBSTANCE: invention relates to a flow-through redox element, in which low-aggressive redox active components are used. Flow-through redox element includes a reaction cell with two electrode compartments for catholyte and anolyte, each of which is connected to at least one liquid storage tank, which are separated from each other by an ion-conducting membrane and which are equipped with electrodes, wherein electrode compartments are filled with electrolyte solutions containing redox active components dissolved or dispersed in electrolyte solvent, as well as containing, if necessary, dissolved in it conductive salts and, possibly, other additives. Flowing redox element is characterized by that the anolyte contains a redox active component with one to six groups of formula (I) or one to six groups of formula (II) in the molecule, and in that the catholyte contains a redox-active component with one to six groups of formula (III) in a molecule or an iron salt, or by the fact that the anolyte and catholyte contain a redox active component with one to six groups of formula (I) or formula (II) in combination with one to six groups of formula (III) in the molecule, where R₁ is a covalent bond C-C or a divalent bridging group, R₂ and R₃ independently denote alkyl, alkoxy, haloalkyl, cycloalkyl, aryl, aralkyl, heterocyclyl, halogen, hydroxy-, amino-, nitro- or cyano groups, X—q-charge inorganic or organic anion, b and c independently from each other are integers from 0 to 4, q is integer from 1 to 3, a is a number equal to 2/q, and R₄, R₅, R₆ and R₇ independently denote alkyl, cycloalkyl, aryl or aralkyl. Invention also relates to use of said element for electric power accumulation.

EFFECT: disclosed redox element has improved pumpability.

26 cl, 11 dwg, 8 ex