Development and evaluation of sulfonated polysulfone membranes for the zinc/ferricyanide battery
The successful commercialization of the zinc/ferricyanide battery being developed by Lockhead depends in part on the availability of an inexpensive, chemically stable membrane. Other essential membrane properties include low area resistivity (1 - 5 ..cap omega.. cm/sup 2/) and a low rate of iron permeation (4 x 10/sup -5/millimoles Fe/cm/sup 2//h). A cast membrane which contained one sulfonate group per repeating unit in the backbone exhibited good stability in the alkaline-ferricyanide electrolyte and satisfied the membrane requirements cited above. In ongoing single cell cycling tests, average energy efficiencies of 77% were achieved over 85 charge-discharge cycles with this membrane. If sulfonate polysulfone membranes can be mass produced by extrusion, they can be considered as viable candidates to replace the expensive perfluorsulfonate membranes that were used to demonstrate the technical feasibility of the zinc/ferricyanide battery. The feasibility of preparing composite sulfonated polysulfone membranes by impregnation of microporous PTFE was also demonstrated. The manufacture of composite membranes should be possible using chemical coating equipment.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5622761
- Report Number(s):
- SAND-85-0508C; CONF-850357-7; ON: DE85009104
- Country of Publication:
- United States
- Language:
- English
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Sulfonated polysulfone battery membrane for use in corrosive environments
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Related Subjects
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METALS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPLEXES
EFFICIENCY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELEMENTS
FERRICYANIDES
IRON COMPLEXES
MEMBRANES
METALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PERMEABILITY
POROSITY
SODIUM
SULFONATES
TESTING
TRANSITION ELEMENT COMPLEXES
ZINC COMPOUNDS
ZINC OXIDES