Thermal battery with polymer-based construction

摘要

A thin, flexible, porous polymer composite film useful as a separator for a molten-salt thermal battery having a lower temperature electrolyte melt formulation 150-250° C. typical of molten alkyl nitrate/nitrite comprises 5-50 weight percent of electrically non-conductive ceramic comprising a thermoplastic in the range of 50-95 weight percent. The high-surface-area ceramic is comprised of MgO (preferred), Al2O3, AlSiO2, BN, AlN, or a mixture of two or more of the foregoing; and providing a porous network having a porosity of not less than 30 percent by volume. Likewise, the electrodes can be manufactured with polymer-bonded particulates of porous ceramic such as MgO. Cells for thermal batteries are fabricated in the uncharged state, e.g., Carbon/lithiated metal oxide. Additionally, a polymer-based thermal battery construction can free design from the rigid stacked-pellet battery design. Alternatively, a porous ceramic composite film of MgO coated non-conductive ceramic fibers may be used as a separator.

主权项

1. A flexible, porous polymer composite film comprising 50 percent to 90 percent by weight of the porous polymer composite film of a polymer and 10 percent to 50 percent by weight of the porous polymer composite film of an electrically non-conductive porous ceramic; wherein the electrically non-conductive porous ceramics comprise MgO, Al2O3, AlSiO2, BN, AlN, or a mixture of two or more of the foregoing; and the electrically non-conductive porous ceramic interconnects providing a porous network of electrically non-conductive porous ceramic having a porosity of not less than 30 percent by volume; the pores of the network containing an alkali metal nitrate/nitrite electrolyte in an amount of up to 70 percent by volume based on pore volume of the network.