Rechargeable alkaline zinc/ferricyanide battery, phase 2

The technical advancement of the alkaline zinc/ferricyanide battery to meet goals of scale up and the solid reactant storage with 1000-cm(2) full scale cells was demonstrated. A conceptual engineering design for a 50-kW solar photovoltaic storage system was developed, solar acceptance random cycling was demonstrated and cycle life of cells operating at 70- and 200-mA.h/cm(2) capacity was demonstrated. A crystallizer/reservoir with a capacity of 300 mA.h/cm(2) that delivers solids free electrolyte to the cell was tested. A conceptual engineering design of a 50-kW solar storage battery system was formulated with mass and thermal balances computed. Mean voltaic and coulombic efficiencies are 83.3 +- 1.8% and 92.0 +- 1.8%, respectively. Single cell cycle life tests run under similar conditions at 249 +- 45 mA.h/cm(2) have logged over 220 cycles with mean energy efficiency of 75.3 +- 5.1%. Mean voltaic and coulombic efficiencies are 84.7 +- 2.0 and 89.0+- 6.0, respectively.