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Separator for nonaqueous secondary batteries, method for producing same and nonaqueous secondary battery

A secondary battery, non-aqueous technology, applied in the direction of non-aqueous electrolyte batteries, battery components, circuits, etc., can solve the problem of cycle life reduction and achieve high manufacturing efficiency

Inactive Publication Date: 2016-12-14
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the package made of aluminum laminate film is soft, in a battery (so-called flexible package battery) using the package as an external packaging material, it is easy to cause damage to the battery due to external impact, expansion and contraction of electrodes accompanying charge and discharge. A gap is formed between the electrode and the separator, which sometimes reduces the cycle life

Method used

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  • Separator for nonaqueous secondary batteries, method for producing same and nonaqueous secondary battery
  • Separator for nonaqueous secondary batteries, method for producing same and nonaqueous secondary battery
  • Separator for nonaqueous secondary batteries, method for producing same and nonaqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0164] Examples are given below to describe more concretely the separator and the non-aqueous secondary battery of the present disclosure. However, the separator and the non-aqueous secondary battery of the present disclosure are not limited to the following examples.

[0165]

[0166] The measuring methods used in each Example and Comparative Example are as follows.

[0167] [film thickness]

[0168] The film thickness (μm) of the porous substrate and the separator was determined by measuring 20 points using a contact-type thickness gauge (LITEMATIC manufactured by Mitutoyo Corporation), and calculating the average value. A cylindrical terminal with a diameter of 5 mm was used as a measurement terminal, and it was adjusted so that a load of 7 g was applied during the measurement.

[0169] The coating thickness (μm) of the porous layer was obtained by subtracting the film thickness of the porous substrate from the film thickness of the separator.

[0170] [Weight per unit...

Embodiment A1

[0191] A polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP, KYNAR2800 manufactured by Arkema) was dissolved in a mixed solvent of acetone and water at a mass ratio of 95:5 to prepare a coating liquid. The concentration of PVDF-HFP in the coating liquid was 10% by mass.

[0192] Using a bar coater (bar coater) #6, the coating solution was applied to a polyethylene microporous membrane (thickness of 9.1 μm, Gurley value of 160 seconds / 100cc, porosity of 33 μm) as a porous substrate. %), forming coating layers on both sides of the porous substrate. This coating layer was dried at 60° C. to obtain a separator having porous layers on both surfaces of a polyethylene microporous membrane. The surface of the separator was observed with a scanning electron microscope (SEM), and it was confirmed that the porous layer had a honeycomb structure. The SEM image obtained by observing the surface of the separator from the vertical direction is shown in figure 1 .

Embodiment A2

[0194]Except having changed the mass ratio of acetone and water in a mixed solvent to 97.5:2.5, it carried out similarly to Example A1, and obtained the separator which has a porous layer on both surfaces of a polyethylene microporous membrane. The surface of this separator was observed by SEM, and it was confirmed that the porous layer had a honeycomb structure.

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Abstract

A separator for nonaqueous secondary batteries, which is provided with: a porous base that contains a thermoplastic resin; and a porous layer that is provided on one surface or both surfaces of the porous base and contains a polyvinylidene fluoride resin. The porous layer has a structure wherein a plurality of cells, each of which opened in the direction perpendicular to the surface of the porous layer, are aligned adjacent to each other in the plane direction of the porous layer, and has a contact angle with water of from 115 degrees to 140 degrees.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous secondary battery, a method for producing the same, and a nonaqueous secondary battery. Background technique [0002] Non-aqueous secondary batteries typified by lithium ion secondary batteries are widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, and camcorders. [0003] In recent years, along with the miniaturization and weight reduction of portable electronic devices, the simplification and weight reduction of the external packaging of non-aqueous secondary batteries have been realized, and aluminum casings have been developed as external packaging materials instead of stainless steel casings. , In addition, instead of a metal casing, an aluminum laminated film package (pack) has been developed. However, since the package made of aluminum laminate film is soft, in a battery (so-called soft package battery) using the p...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/18H01M50/403H01M50/417H01M50/426H01M50/443H01M50/457H01M50/469
CPCY02E60/10H01M50/417H01M50/403H01M50/457H01M50/443H01M50/469H01M50/426H01M50/489H01M50/449H01M50/46H01M10/0525Y02P70/50
Inventor 本多劝
Owner TEIJIN LTD