Siemens Aktiengesellschaft

Litricity, Llc.

Barbara Schricker

Manfred Baldauf

Clemens Otte

Holger Wolfschmidt

Robert Fleck

Jochen Friedl

Armin Datz

Manfred Waidhas

Peter Otschik

Axel Reitinger

Michael Meinert

Karsten Rechenberg

Christopher Betzin

Sascha Schulte

Ulrich Stimming

Jacob Johan Rabbers

Winfried Schaffrath

Matthäa Schwob

Matthäa Holland-Cunz

Jonas Witt

Cecilia Margareta Bruhn

Various embodiments include a redox flow battery comprising: a cell divided into half-cells by a membrane; an electrolyte able to flow through the interior of the respective half-cell; an electrode; and a guide structure for guiding the electrolyte integrated into and defined by the associated electrode. Each half-cell comprises a current collector and an electrode element arranged in an interior of the respective half-cell.

Redox flow battery and method for producing a guide structure of an electrode element of a redox flow battery

Various embodiments include a method for operating an electrically rechargeable redox flow battery comprising a first chamber and a second chamber separated by a membrane, with the first chamber comprising a cathode and the second chamber comprising an anode. The method comprises: introducting a first electrolyte as catholyte into the first chamber; and introducing a second electrolyte as anolyte into the second chamber. At least one of the first electrolyte or the second electrolyte comprises a reduction-oxidation pair. The oxidation number of the reduction-oxidation pair is changed by addition of a first component.

Redox flow battery and method for operating a redox flow battery

Various embodiments include a method for operating an electrically rechargeable redox flow battery comprising: using a redox flow battery having a first chamber and a second chamber separated by a membrane, wherein the first chamber comprises a cathode and the second chamber comprises an anode; conducting a first electrolyte as catholyte into the first chamber and conducting a second electrolyte as anolyte into the second chamber; and charging or discharging the redox flow battery. The first electrolyte comprises a first reduction-oxidation pair and the second electrolyte comprises a second reduction-oxidation pair. At least one of the first electrolyte and the second electrolyte comprises a pH-stabilizing buffer for chemically stabilizing the reduction-oxidation pair.

Various embodiments include an electrically rechargeable redox flow battery comprising: a first chamber; a second chamber; a membrane separating the first chamber from the second chamber; a cathode in the first chamber; and an anode in the second chamber. At least one of the cathode and the anode comprises a first planar surface including elevations enlarging the surface area. The elevations form flow channels for an electrolyte. The at least one of the cathode and the anode further comprises a material selected from the group consisting of: lead, bismuth, zinc, titanium, molybdenum, and tungsten.

Redox flow battery

Various embodiments include an energy storage apparatus for providing electrical energy comprising: a meter for capturing an electrical load profile to be provided and operating state values of energy storage devices; a data memory for storing data relating to an assessment profile for a respective energy storage device, wherein the assessment profile represents effects of operating parameters on a respective criterion of a respective energy storage device; a processor for dividing the electrical load profile into partial load profiles and assigning them to a respective energy storage device optimized based at least in part on the respective criterion and the respective operating state values; and an open-loop controller for operating the energy storage devices selected by the processor to jointly provide electrical power for the electrical load profile.

Energy storage apparatus

An energy storage device includes a battery with at least one battery cell and two poles, two connection points each connected to battery pole, for connecting to an external current circuit for charging and discharging the battery, a battery charge state monitoring device, an additional energy storage element different than the battery cell, a connection circuit for connecting the additional energy storage element to at least one battery pole, and at least one connection point. The connection circuit is designed such that a specified energy storage element current having a specified relationship with the total current flowing through the energy storage device is charged into and/or discharged from the energy storage element. A voltage measuring device contacts the additional energy storage element to measure an energy storage voltage, and the charge state monitoring device determines the charge state of the battery based at least on the energy storage voltage.

Energy storage device

A gas diffusion electrode for a PEM fuel cell includes a metallic catalyst, and an electrocatalyst layer having a polymer A for hydrophobicizing the electrocatalyst layer and a uniform thickness of between 3 to 40 &#x3bc;m, especially 25 &#x3bc;m. The polymer A content is less than 10% by weight based on the metallic catalyst content. Methods of producing and of hydrophobicizing the electrode include screen printing a paste onto a carrier and removing the screen-printing medium by heating. The paste includes at least one metallic catalyst with a content of polymer A up to at most 10% by weight, and a screen-printing medium. The electrocatalyst layer of the electrode has a significantly lower content of the catalyst inhibitor TEFLON&#xae; because it is not added only to the screen-printing paste but is subsequently applied, with the same surface-specific effect, by dipping the finished electrocatalyst layer in a solution containing TEFLON&#xae;.

Gas diffusion electrode and method for its production

A screen-printing paste as a starting material for fabricating a gas diffusion electrode through screen-printing includes at least one polymer, at least one metallic catalyst, and a high-boiling solvent. The polymer is a binder including poly(butyl acrylate)-polymethacrylate copolymer, a poly(vinyl alcohol), and a poly(ethylene oxide). The polymer can be two polymers, a first being used for hydrophobicization and present in an amount of between 0 to 10% by weight based on a content of the metallic-catalyst, and a second being a binder. A screen-printing method of fabricating the electrode for a fuel cell includes forming a screen-printing layer having a thickness between 3 and 40 &mgr;m by applying the screen-printing paste to a base. The solvent and the polymer serve as a screen-printing medium. The screen-printing layer is baked to allow only residues of the solvent and the polymer to remain, which do not interfere with using the electrode in a fuel cell. The method uses a polybutylacrylate-polymethacrylate copolymer as a binder in the screen-printing paste.

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Erlangen, Germany

Barbara Schricker