Loading patent…
AssigneeTeijin Limited
InventorsSatoshi Nishikawa, Hiroyuki Honmoto, Takahiro Daido
Estimating the term…
A nonaqueous secondary battery separator which is a composite porous membrane obtained by integrally covering both sides of a polyolefin microporous membrane having a gas permeability (JIS P8117) of between 15 seconds/100 cc·μm and 50 seconds/100 cc·μm per unit thickness and a film thickness of between 5 μm and 25 μm, with a porous layer composed of polymetaphenylene isophthalamide, and which exhibits both a shutdown function and effective heat resistance for meltdown resistance, as features desired for high-energy-density, high-output, large-sized, high-performance nonaqueous secondary batteries, while also having excellent handleability and ion permeability. The film thickness of the composite porous membrane is between 6 μm and 35 μm, the gas permeability (JIS P8117) is between 1.01 and 2.00 times that of the polyolefin microporous membrane, and the polymetaphenylene isophthalamide coating amount is between 1.0 g/m2 and 4.0 g/m2.
A nonaqueous secondary battery separator which is a composite porous membrane obtained by integrally coating both sides of a polyolefin microporous membrane having a gas permeability (JIS P8117) of between 15 seconds/100 cc·μm and 50 seconds/100 cc·μm per unit thickness and a film thickness of between 5 μm and 25 μm, with a porous layer composed of polymetaphenylene isophthalamide, characterized in that the film thickness of the composite porous membrane is between 6 μm and 35 μm, the gas permeability (JIS P8117) is between 1.01 and 2.00 times that of the polyolefin microporous membrane and the polymetaphenylene isophthalamide total coating amount of both sides is between 1.0 g/m2 and 4.0 g/m2.
Dependencies are inferred from the claim text.