Abstract:
A secondary battery utilizing a molten alkali metal anode, a porous conductive carbon cathode, a molten alkali metal chloraluminate electrolyte and a selectively-ionically-conductive separator positioned between the anode and the cathode and a process for producing alkali metal therewith.
Abstract:
A comparator element for gaseous oxygen comprises a first and a second oxygen-inert metal electrochemical cell. The first cell is fed with an oxygen containing gas of known oxygen content and the second cell is fed with a gas of unknown oxygen content. The design of the electrochemical cells is such that their electrical resistance when current is passed therethrough is inversely proportional to the oxygen content of the feed gas over a useful range. By comparing the resistances of the two cells, an accurate determination of the oxygen content of the unknown gas may be made with self compensation for ambient temperature. The range of the instrument may be increased by restricting the flow of gas to the oxygen electrodes. This may be accomplished by flowing the gas through a diffusion membrane and an orifice. Oxygen evolved from the metal electrode of the standard cell may be used to feed the oxygen electrode of the same cell thus providing a self sustaining standard atmosphere. The comparator may be compensated for pressure by providing pressure equalizing means between the gas feed to the first cell and the gas feed to the second.
Abstract:
A REDUCED OPERATING TEMPERATURE FOR A SODIUM-SULFUR BATTERY IS ACHIEVED WITH A NEW ELECTROLYTE COMPRISING SODIUM POLYSULFIDE, ALUMINUM SULFIDE OR ALUMINUM POLYSULFIDES AND FREE SULFUR WHEN THE ELECTRODES ARE IN THE CHARGE CONDITION. THE ELECTROLYTE, WHICH HAS A MELTING POINT IN THE RANGE OF APPROXIMATELY 200*C., PERMITS THE BATTERY TO BE SEALED WITH POLUTETRAFLUOROETHYLENE SEALING MATERIALS. BASED ON PRESENT LIMITED DATA, IT APPEARS THAT THE REDUCED MELTING POINT TEMPERATURE OF THE ELECTROLYTE CAN BE OBTAINED WITH SOLUTIONS IN WHICH THE RATIO OF THE MOLE PERCENT OF SODIUM POLYSULFIDE TO THE MOLE PERCENT OF ALUMINUM SULFIDE OR ALUMINUM POLYSULFIDE VARIES CONSIDERABLY.
Abstract:
High temperature secondary cells having a molten salt or fused salt electrolyte are fabricated in ambient atmosphere. Such cells typically have an electrolyte, a positive reactant or a negative reactant which are capable of reacting with moisture or oxygen contained in the atmosphere. The ingredients or materials comprising the positive and negative reactants and the electrolyte are processed in a state in which they do not react significantly with moisture or oxygen in the ambient atmosphere. Thereafter, they are electrically charged in the positive reactant compartment of a cell container at the operating temperature of the cell whereby the negative reactant of the cell is provided in the negative reactant compartment of the cell container and a positive reactant-electrolyte melt is provided in the positive reactant compartment of the cell container.
Abstract:
A secondary battery utilizing a molten alkali metal negative reactant, a metal chloride positive reactant, a molten alkali metal chloraluminate electrolyte and a selectively-ionically-conductive separator positioned between the negative and the positive reactants.