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Coating liquid and laminated porous membrane

A technology of coating liquid and adhesive, applied in the direction of electrical components, circuits, battery pack components, etc., can solve problems such as direct contact, short circuit, insufficient shape stability of separators, etc.

Active Publication Date: 2017-01-11
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of severe heat generation, etc., there is a possibility that the positive electrode and the negative electrode are in direct contact due to shrinkage of the separator including the polyolefin porous film, film rupture, etc., thereby causing a short circuit.
As a result, the shape stability of the separator including the polyolefin porous film is insufficient, and abnormal heat generation due to a short circuit may not be suppressed in some cases.

Method used

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  • Coating liquid and laminated porous membrane
  • Coating liquid and laminated porous membrane
  • Coating liquid and laminated porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0172] (1) Manufacture of slurry

[0173] The slurry of Example 1 was produced in the following procedure.

[0174] The filler 1 was added to the stirring water so that the alumina concentration became 30.0% by weight, and a slurry (1) was obtained. Next, with the wet pulverization conditions (disk peripheral speed: 10m / sec, bead material: ZrO 2 , bead diameter: 1.0mm, bead filling rate: 85% by volume (relative to the container volume of DYNO MILL), flow rate 0.5L / min, residence time: 2.9 minutes, slurry temperature: 20 ° C ~ 40 ° C) to the slurry Material (1) was subjected to wet pulverization to obtain slurry (2). The median diameter (D50) of alumina in the slurry (2) was 0.66 μm. Then, the slurry (2) was dried to obtain a powder. The adsorption isotherm of this powder was measured and analyzed. The hydrophilicity parameter A of this powder is 0.37 (BET 1 =2.0m 2 / g, BET 2 =5.4m 2 / g).

[0175] (2) Manufacture of coating liquid

[0176] The slurry ( 2), CMC and s...

Embodiment 2

[0194] (1) Manufacture of slurry

[0195] Except that the residence time is set to 8.0 minutes, according to the same operation as the production method of the slurry (2) in the above-mentioned Example 1, a mixture comprising a median particle size (D50)=0.43 and a hydrophilic parameter A of 0.49 (BET 1 =3.5m 2 / g, BET 2 =7.2m 2 / g) of alumina slurry (3).

[0196] (2) Manufacture of coating liquid

[0197] Except having used the slurry (3), it carried out similarly to Example 1, and obtained the coating liquid (2).

[0198] (3) Manufacture and evaluation of physical properties of laminated porous membrane

[0199] Except having used the coating liquid 2, it carried out similarly to Example 1, and obtained the laminated porous membrane (2).

[0200] Table 1 describes the physical properties of the laminated porous film (2).

[0201] (4) Evaluation of cycle characteristics

[0202] Except having used the laminated porous membrane (2), it carried out similarly to Example...

reference example 1

[0213] Slurry (4) was obtained in the same manner as the production method of slurry (2) in Example 1 above except that the residence time was set to 12.0 minutes. The alumina in the slurry (4) had a median diameter (D50) of 0.41 μm. Next, the slurry (4) was dried to obtain a powder. Carried out the measurement of the adsorption isotherm of this powder, and calculated hydrophilicity parameter A to be 0.57 (BET 1 =4.4m 2 / g, BET 2 =7.7m 2 / g). The results are described in Table 3.

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Abstract

The invention relates to a laminated porous membrane which is applicable to a separator of a secondary battery employing non-aqueous electrolyte and having excellent cycle performance and has a heat resisting layer as well as a coating liquid used for forming the heat resisting layer. The coating liquid comprises filler, an adhesive and a solvent, wherein a hydrophilic parameter A of the filler defined in a formula (1) is 0.35-0.65. The hydrophilic parameter A is equal to BET1 / BET2 according to the formula (1), in the formula (1), BET1 is the specific surface area, worked out through a difference adsorption isotherm obtained by subtracting a secondary adsorption isotherm from a primary adsorption isotherm determined when water vapor is adsorbed by the filler with a BET method, of the filler; BET2 is the specific surface area, worked out through an adsorption isotherm determined when nitrogen is adsorbed by the filler with the BET method, of the filler.

Description

[0001] This application is a divisional application, the application number of its parent application: 201480000811.X (PCT / JP2014 / 052369), filing date: 2014.1.27, invention name: coating liquid and laminated porous film technical field [0002] The present invention relates to a coating solution and a laminated porous film. Background technique [0003] Non-aqueous electrolyte secondary batteries, especially lithium ion secondary batteries, have high energy density, and thus are widely used as batteries for personal computers, mobile phones, portable information terminals, and the like. [0004] Non-aqueous electrolyte secondary batteries represented by lithium-ion secondary batteries have high energy density, so when internal or external short circuits occur due to damage to the battery or equipment using the battery, a large current flows and Let the battery heat up violently. [0005] Therefore, non-aqueous electrolyte secondary batteries are required to have a function ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/454
CPCH01M50/449H01M50/431H01M50/446Y02E60/10
Inventor 铃木纯次菅原健一朗千原正照
Owner SUMITOMO CHEM CO LTD