Separator for nonaqueous secondary battery, and nonaqueous secondary battery
AssigneeTeijin Limited
InventorSatoshi Nishikawa
Life of this patent
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Abstract
An object of the invention is to provide a separator for a nonaqueous secondary battery, which has good adhesion to electrodes and is also capable of ensuring sufficient ion permeability even after attachment to an electrode. The separator for a nonaqueous secondary battery of the invention includes a porous substrate and an adhesive porous layer formed on at least one side of the porous substrate and containing a polyvinylidene-fluoride-based resin. The separator for a nonaqueous secondary battery is characterized in that the polyvinylidene-fluoride-based resin has a weight average molecular weight of 600,000 to 3,000,000.
Claims14
A separator for a nonaqueous secondary battery, comprising a porous substrate consisting of a polyolefin microporous membrane, and an adhesive porous layer that is formed on at least one side of the porous substrate and contains a polyvinylidene-fluoride-based resin,
- the separator for a nonaqueous secondary battery being characterized in that the polyvinylidene-fluoride-based resin has a weight average molecular weight of 600,000 or more and 3,000,000 or less,
- wherein the value obtained by subtracting the Gurley value of the porous substrate from the Gurley value of the separator for a nonaqueous secondary battery with the adhesive porous layer formed thereon is 0 to 300 sec/100 cc.
Dependencies are inferred from the claim text.