JP2017103229A5 - - Google Patents

Description

If the air permeability is less than the above range , it means that the laminated separator has a rough laminated structure due to the high porosity of the laminated separator, and as a result, the strength of the separator is reduced, particularly at high temperatures. There is a risk that the shape stability of the material becomes insufficient. On the other hand, when the air permeability exceeds the above range , when the laminated separator is used as a member for a non-aqueous electrolyte secondary battery, sufficient ion permeability cannot be obtained, and the non-aqueous electrolyte The battery characteristics of the secondary battery may be degraded.

Claims (5)

A porous film which is a stretched film containing 90% by volume or more of polyethylene ,
The film thickness is 20 μm or less,
The porosity is 20-55%,
Between the frame having a rectangular hole of 47 mm × 35 mm and the plate, the porous film is arranged so that the long side of the hole is parallel to the MD, and the porous film is attached to the frame and the plate. A falling ball test is performed to confirm the presence or absence of tearing of the porous film when a ball having a diameter of 14.3 mm and a weight of 11.9 g is freely dropped on the porous film from above the center of the hole. While changing the height of the ball, repeat the test until the number of falling ball tests in which tearing was confirmed and the number of falling ball tests in which tearing was not confirmed were 5 or more. A separator for a non-aqueous electrolyte secondary battery , wherein the lowest sphere has a height of 50 cm or more and 150 cm or less ,
A non-aqueous electrolyte secondary battery laminated separator comprising: a porous layer containing a resin . A separator for a nonaqueous electrolyte secondary battery, which is a porous film, which is a stretched film containing 90% by volume or more of polyethylene, a film thickness of 20 μm or less, and a porosity of 20 to 55%;
A non-aqueous electrolyte secondary battery laminated separator comprising a porous layer containing a resin laminated on the non-aqueous electrolyte secondary battery separator,
The non-aqueous electrolyte secondary battery laminated separator is arranged between a frame having a rectangular hole of 47 mm × 35 mm and a plate so that the long side of the hole is parallel to MD, and the non-aqueous electrolysis A laminated separator for a liquid secondary battery is sandwiched between the frame and the plate, and a ball having a diameter of 14.3 mm and a weight of 11.9 g is placed on the laminated separator for a non-aqueous electrolyte secondary battery from above the center of the hole. The number of falling ball tests in which tearing was confirmed while changing the height of the ball while changing the height of the ball, and the number of times the tearing was broken. Non-water, characterized in that the number of falling ball tests that were not confirmed is repeated until the number of falling ball tests reaches 5 or more, and the lowest ball height among the falling ball tests in which tearing is confirmed is 50 cm or more and 150 cm or less. Laminated cell for electrolyte secondary battery Regulator. The multilayer separator for nonaqueous electrolyte secondary batteries according to claim 1 or 2, wherein the resin is an aromatic polyamide. A nonaqueous electrolyte secondary battery comprising a positive electrode, a laminated separator for a nonaqueous electrolyte secondary battery according to any one of claims 1 to 3, and a negative electrode arranged in this order. Battery member. Non-aqueous electrolyte secondary battery, comprising the nonaqueous electrolyte laminated separator for a secondary battery according to any one of claims 1 to 3.