Separator

A technology for separators and non-woven fabrics, which is applied in the direction of electrical components, structural parts, battery pack components, etc., and can solve the problems of low uniformity of spunbonded non-woven fabric layers, reduced electrolyte mobility, and electrolyte retention.

Active Publication Date: 2014-12-10
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uniformity of the spun-bonded non-woven fabric layer itself is still low, and there is a concern that the mobility of the electrolyte and the retention of the electrolyte solution may be reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～11

[0105] Laminated nonwoven fabrics of Examples 1 to 11 were produced by the following method, and performance evaluation was implemented.

[0106] In order to obtain the ultrafine fiber web for the ultrafine fiber nonwoven fabric layer (I layer), a solution of PET (having a melt viscosity measured at a temperature of 35° C. using OCP as a solvent: ηsp / c=0.50), At spinning temperature 300°C, heating air 1000Nm 3 Under the condition of / hr / m, it is extruded towards the moving catch net and spun by melt blowing method. At this time, the distance from the melt-blowing nozzle to the microfiber web was 100 mm, the suction force of the collecting surface directly below the melt-blowing nozzle was 0.2 kPa, and the wind speed was 7 m / sec. Adjustment of the fiber diameter and degree of crystallization was performed by adjusting the amount of heated air.

[0107] Next, in order to obtain a nonwoven fabric layer (layer II) made of thermoplastic resin fibers, a solution of general-purpose...

Embodiment 12

[0110] As the non-woven fabric layer (I layer), in the same manner as in Example 1, a melt-blown fiber web that becomes the non-woven fabric layer (I) layer is made; as the non-woven fabric layer (II layer), a fiber diameter of 18 μm and a fiber length of 5mm short fiber of co-PET / PET sheath core structure. Concretely, capture by the shoveling method so that the net becomes 30g / m 2 , after dehydration and drying, the fibers were fused with a hot air method (180° C., 5 m / min) to obtain a nonwoven fabric layer (layer I) / short fiber web (layer II). Furthermore, the nonwoven fabric layer (1 layer) produced similarly to Example 1 was laminated|stacked on the web obtained above, and the laminated web which consists of 3 layers was obtained. The obtained laminated web was thermally bonded with a flat roll and a calender roll to obtain a laminated nonwoven fabric. Table 1 shows the composition and formation conditions of the laminated nonwoven fabric. In Table 1, the melting points...

Embodiment 13

[0112] As the thermoplastic resin, PPS (Fortron manufactured by Polyplastics Co., Ltd.) was used. The conditions for forming a nonwoven fabric are as follows.

[0113] Layer I: Melt viscosity of resin: 670g / 10min (measured by the same method as above, measurement conditions: load 5kg, temperature 315.6°C), spinning temperature: 340°C, heating air temperature: 390°C, heating air volume: 1000Nm 3 / hr / m.

[0114] Layer II: melt viscosity of resin: 70 g / 10 minutes (measured using a capillary rheometer, measurement conditions: load 5 kg, temperature 315.6° C.), spinning temperature: 320° C., spinning speed: 8000 m / min.

[0115] In addition, thermal bonding conditions using a flat roll are: line pressure: 260N / cm, roll temperature: up / down = 150°C / 150°C, and calendering conditions are line pressure: 350N / cm, roll temperature: up / down = 70°C / 70°C. Table 1 shows the conditions for forming the laminated nonwoven fabric and its properties, respectively. Other conditions are the sam...

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Abstract

Provided is a separator which shows excellent performance in electric insulation, electrolyte-holding property and ion- or electron-permeability and which can be stably manufactured. The separator is configured from a laminate non-woven fabric consisting of at least two layers, said layers including a non-woven fabric layer (layer I) that comprises a synthetic fiber having a fiber size of 0.1 mum or greater and less than 4.0 mum and a non-woven fabric layer (layer II) that comprises a thermoplastic resin fiber having a fiber size of 4.0-30.0 mum inclusive, and has a weight per area of 3.0 g/m2 or greater and less than 20.0 g/m2.

Description

technical field [0001] This invention relates to the separator using the laminated nonwoven fabric of a specific structure. More specifically, the present invention relates to a separator for an electrochemical cell such as a primary battery, a secondary battery, or a fuel cell, and a separator for an electrical energy storage device. [0002] In this specification, an electrochemical battery can be interpreted as all kinds of primary and secondary batteries, especially batteries based on alkali metals such as lithium, lithium ion, lithium polymer and alkaline earth metals. [0003] Electrical energy storage devices can be interpreted as electric double layer capacitors, especially lithium-ion capacitors. Background technique [0004] With the miniaturization and high efficiency of electronic equipment in recent years, energy equipment such as batteries and capacitors are required to have high functionalities such as high energy density and high reliability. [0005] In pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01G11/52H01M2/18H01M50/414H01M50/434H01M50/451H01M50/454H01M50/457H01M50/489H01M50/494
CPCH01M2/1686H01M2/162Y02E60/13H01G11/52H01M10/052H01M50/4295H01M50/44H01M50/494H01M50/451H01M50/489H01M50/414H01M50/434H01M50/454H01M50/457Y02E60/10Y02P70/50H01M10/0525H01M2220/30H01M2220/20H01M50/431H01M50/446
Inventor 山田裕介日下部纯一小尾留美名冈岛真一加藤一史
Owner ASAHI KASEI KK
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