Batteries including improved fine fiber separators
AssigneeE. I. Du Pont de Nemours and Company
InventorsPankaj Arora, Simon Frisk, Lu Zhang
Life of this patent
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Abstract
Alkaline and lithium batteries are disclosed that advantageously include separators comprising at least one porous layer of fine fibers having a diameter of between about 50 nm and about 3000 nm that provide improved combinations of reduced thickness, dendritic barrier against short-circuiting and low ionic resistance as compared with known battery separators.
Claims25
A battery having a separator comprising a porous fine fiber layer of polymeric fibers having a mean diameter in the range from about 50 nm to about 3000 nm, wherein the porous fine fiber layer has a mean flow pore size of between about 0.01 μm and about 15 μm, a thickness of between about 0.1 mils (0.0025 mm) and about 12 mils (0.3 mm), a porosity of between about 20% and about 90%, a basis weight of between about 1 g/m2 and about 90 g/m2, a Frazier air permeability of less than about 150 cfm/ft2 (46 m3/min/m2) and a MacMullin number of between about 2 and about 15.
A lithium battery having a separator comprising a porous nanofiber layer of polymeric fibers having a mean diameter in the range from about 50 nm to about 1000 nm, wherein the nanofiber layer has a mean flow pore size of between about 0.01 μm and about 10 μm, a thickness of between about 0.1 mils (0.0025 mm) and about 5 mils (0.127 mm), a basis weight of between about 1 g/m2 and about 30 g/m2, a porosity of between about 20% and about 90%, a Frazier air permeability of less than about 50 cfm/ft2 (15 m3/min/m2) and a MacMullin number of between about 2 and about 15.
Dependencies are inferred from the claim text.