Some time ago GE announced that it was planning manufacture sodium metal halide batteries for utility scale storage applications. They have now revealed that the metal/halide combination in question is nickel/chlorine, the same as that used in ">FZ Sonicks's Zebra batteries. Some information taken from Durathon Utilility Battery Brochure is listed below:gravimetric energy density: 115 Wh/kg
The advertised cycle life of >3000 is in between FZ Sonicks's (>2000) and NGK Insulators (=4500).
Some information taken from Durathon Utililty Battery Spec Sheet:Round trip efficiency (2h discharge/4h recharge): 91%
Jun 25, 2011
rogerkb [at] energystoragenews [dot] com