US 9,865,857 B2 · Laminated body, separator, and nonaqueous secondary battery

Abstract

A first laminated body includes: a porous film containing a polyolefin as a main component; and a porous layer on at least one surface of the porous film, the porous layer containing a resin. A second laminated body includes: a porous film containing a polyolefin as a main component; and a porous layer containing a resin. The laminated body is usable as a secondary battery separator having a higher dielectric strength. A third laminated body is provided in which occurrence of a curl is prevented. A nonaqueous secondary battery separator is provided disposed between a cathode and an anode, the separator including: a porous base material containing a polyolefin as a main component; and a porous layer on at least one surface of the porous base material, the porous layer containing a polyvinylidene fluoride-based resin.

Claims5

Dependent claims

A separator, comprising:

a laminated body comprising:
a stack of (i) a first porous layer containing a polyolefin-based resin and (ii) a second porous layer containing a polyvinylidene fluoride-based resin,
a difference between (A) a water content rate of the laminated body in an atmosphere having a dew point of 20° C. and (B) a water content rate of the laminated body in an atmosphere having a dew point of −30° C. is 100 ppm or more and 1000 ppm or less,
a difference between (C) a water content of the first porous layer and (D) a water content of the second porous layer both in an atmosphere having a dew point of 20° C. is 1 mg/m2 or more and 10 mg/m2 or less, and
respective openings of pores each having an area of 0.5 μm2 or more occupying 0.001% to 30% of a surface of the second porous layer.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/781,791Filed 27 Jul 2015

Priority

JP 2014-17548829 Aug 2014

Published

US 2017/0170443 A115 Jun 2017

Granted

9 Jan 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification31 codes

H01M 4/505
Of manganese: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/131
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/133
Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof: electrodes based on…
H01M 4/525
Of nickel, cobalt or iron: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g.…

Laminated body, separator, and nonaqueous secondary battery

Life of this patent

Laminated body, separator, and nonaqueous secondary battery

Life of this patent

Abstract

Claims5