Oxygen Permeable Membrane for Lithium Air Batteries
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111 Downey Street, Norwood, MA, 02062
AbstractThe development of a gas permeable membrane with an O2 permeability coefficient (Dk) of > 2000 Barrers and carbonate permeability coefficient of <10 Barrers is proposed. The membrane is designed using a polysiloxane polymer as the basis by taking into account that silicone rubber has the highest oxygen permeability at least two orders of magnitude better than any other polymer known today. The membrane will curtail ingression of moisture into the Li-air cell and minimize egression of electrolyte solvents out of the cell, thus ensuring uninterrupted and steady utilization of its designed capacity and also, preservation of its functionality during extended storage. The high oxygen permeability expected from this membrane will allow the Li-air battery to use ambient air as its oxygen source, and realize specific energies > 500 Wh/kg. The membrane could also be useful in hydrogen-oxygen fuel cells, metal-air battery cells and oxygen sensing devices. The principal Phase I objective is to synthesize materials and to demonstrate the enhanced oxygen transport ability of the membrane while retarding carbonate and moisture transport. They membrane will be free of pinholes and has adequate mechanical properties to be useful in thicknesses as low as 25 micrometers.
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