Improved Method for Fixating Sludges and Soils Contaminated with Mercury and Other Heavy Metals

Not Available PolyPlus Battery Company is developing advanced secondary batteries based on lithium polysulfide chemistry. The Navy has an immediate need for secondary batteries having energy densities superior to Ag/Zn cells. Given the high energy density of Ag/Zn chemistry, the Navy seeks alternative cathodes having theoretical energy densities in excess of 1500 Wh/kg. PolyPlus Battery Company is developing a battery based on the chemistry of lithium polysulfides. The reversible cell reaction is 2 Li + S = Li2S. The lithium polysulfide cathode has a gravimetric capacity of 1165 mAh/g and a nominal cell potential of 2.0 volts, giving a theoretical energy density of 2330 Wh/kg. The extremely high energy density of the Li/S system is 33 to 55% higher than that requested by the Navy. Furthermore, fully sealed, packaged 2 Ah cells tested at PolyPlus Battery Company's facility have demonstrated exceptionally high specific energies of 150 to 400 Wh/kg at moderate to low rate (C/3 to C/25). These cells have also demonstrated high power densities of over 800 W/kg at room temperature and over 1,000 W/kg (80 Wh/kg) at moderately elevated temperatures (60 ¿C). The superior characteristics of this battery chemistry seem particularly well suited to the Navy's requirements.