Brown, Boveri & Cie Ag

Other

Herbert Kleinschmager

Gert Weddigen

Wilfried Fischer

Wilhelm Haar

Franz-Josef Rohr

Bernd Hartmann

Wilheim Haar

Wolfgang Rupp

An electrochemical storage cell or battery with an anode space for an alkali metal as the anolyte and with a cathode space for a sulfur-containing catholyte substance, which are separated from each other by an alkali-ion-conducting solid electrolyte and are confined by a cell wall of metal, particularly of a light metal or steel. Long-life corrosion protection of the metal cell wall is provided by a protective layer by applying to at least that part of the metal cell wall in contact with the catholyte substance, a foil of corrosion-resistant material 0.01 to 0.2 mm thick by means of a conductive adhesive which retains its adhesive properties at operating temperatures.

Electrochemical storage cell

An electrochemical storage cell or battery with at least one anode filled with a molten alkali metal as the anolyte and at least one cathode chamber filled with a sulfur-containing catholyte substance with the anode chamber and the cathode chamber separated from each other by an alkali-ion-conducting solid electrolyte. To the catholyte substance is added an additive which converts the sulfur chains into an electrically charged state for obtaining electromigration of the sulfur phase. This induces mobilization of the sulfur phase in the cathode chamber and prevents major accumulation of liquid sulfur as an insulator. As a result the cell can be repeatedly recharged with large currents to a greater capacity. Additives are a dienophilic compound or a reaction product of a dienophilic compound and sulfur.

An electrochemical storage cell or battery based on an alkali metal and sulfur having at least one anode chamber and at least one cathode chamber separated from each other by an ion-conducting solid electrolyte, and felt with course-pores and/or low electric conductivity and felt with fine-pores and/or higher electric conductivity located in the cathode chamber, with the felt of coarse-pores and/or low conductivity disposed near the solid electrolyte and the felt of fine-pores and/or higher conductivity disposed further away from the solid electrolyte. This permits rapid and more complete recharging of the cell for covering peak loads in electrical networks.

An electrochemical storage cell or battery based on an alkali metal and sulfur having at least one anode chamber and at least one cathode chamber separated from each other by an ion-conducting solid electrolyte, a felt fabric with capillary activity located in the cathode chamber, and an additive lowering the viscosity of the sulfur in the cathode chamber. Preferred additives are selenium, boron and iodine. Lowering the viscosity of the sulfur permits recharging the cell to a greater capacity.

Electrochemical storage cell or battery based on sodium and sulfur having an anode chamber and a cathode chamber separated from each other by a dividing wall capable of conducting sodium ions, is provided with a screening electrode disposed in the chamber containing sulfur as a reactant between the dividing wall and the outer cell wall of said chamber to electrically screen the cell wall and thereby minimize corrosion of the cell wall.

Electrochemical storage cell or battery

An electrochemical storage cell or battery based on alkali metal and sulfur with at least one anode chamber containing alkali metal and one cathode chamber containing sulfur-alkali compounds separated from each other by an ion-conducting solid electrolyte wherein the sulfur-alkali compounds are at least partially dissolved in an organic liquid solvent with a boiling point above the operating temperature of the cell, the operating temperature being in the range of about 100.degree. to 200 C. The solvent permits lower operating temperature with reduced rate of corrosion.

Growing community of inventors

Eppelheim, Germany

Herbert Kleinschmager