Rechargeable alkaline zinc/ferricyanide battery, Phase III. Final report, 26 October 1981-18 September 1982
Project effort was concentrated primarily on technical advancement of the alkaline zinc/ferricyanide battery to meet goals of scale-up and demonstration of solid-reactant storage with 1000-cm/sup 2/ full-scale cells; development of a conceptual engineering design for a 50-kW solar-photovoltaic storage system; demonstration of solar acceptance random cycling; and determination of cycle life of cells operating at 70- and 200-mA.h/cm/sup 2/ capacity. These goals were met in the design, fabrication, and cyclic testing of a 1000-cm/sup 2/ cell having a flow aspect ratio of 2:1. After some design optimization, energy efficiency in 2N NaOH at 43/sup 0/C is 74 to 78 percent. Testing has been in conjunction with a crystallizer/reservoir designed with a capacity of 300 mA.h/cm/sup 2/ that delivers solids-free electrolyte to the cell. A conceptual engineering design for a 50-kW solar storage-battery system has been formulated with mass and thermal balances computed. Single-cell (60-cm/sup 2/) cycle life tests are in progress at 35 mA/cm/sup 2/ with 2N NaOH electrolyte with Nafion N-125 separator at 40/sup 0/C. Over 800 cycles at 70 mA.h/cm/sup 2/ capacity with mean energy efficiency of 76.6 +- 2.1 percent have been logged. Mean voltaic and coulombic efficiencies are 83.3 +- 1.8 percent and 92.0 +- 1.8 percent, respectively. Single-cell (60-cm/sup 2/) cycle life tests run under similar conditions at 249 +- 45 mA.h/cm/sup 2/ have logged over 220 cycles with mean energy efficiency of 75.3 +- 5.1 percent. Mean voltaic and coulombic efficiencies are 84.7 +- 2.0 and 89.0 +- 6.0, respectively.
- Research Organization:
- Lockheed Missiles and Space Co., Palo Alto, CA (USA). Research Labs.
- OSTI ID:
- 6342295
- Report Number(s):
- SAND-83-7001; ON: DE83010615
- Country of Publication:
- United States
- Language:
- English
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Development of alkaline zinc/ferricyanide battery
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COMPATIBILITY
COMPLEXES
CURRENT DENSITY
DESIGN
DIRECT ENERGY CONVERTERS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROCHEMICAL CELLS
ELECTRODES
ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY STORAGE
ENERGY STORAGE SYSTEMS
ENERGY SYSTEMS
EQUIPMENT
FABRICATION
FEASIBILITY STUDIES
FERRICYANIDES
FUEL CELLS
IRON COMPLEXES
METALS
OFF-PEAK ENERGY STORAGE
OPTIMIZATION
PERFORMANCE TESTING
PHOTOVOLTAIC POWER SUPPLIES
PHYSICAL PROPERTIES
POWER SUPPLIES
REDOX FUEL CELLS
REGENERATIVE FUEL CELLS
SOLAR EQUIPMENT
STORAGE
TESTING
THERMODYNAMICS
TRANSITION ELEMENT COMPLEXES
ZINC