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Slurry composition for porous film in battery, method for manufacturing porous film for secondary battery, porous film for secondary battery, electrode for secondary battery, separator for secondary battery, and secondary battery

A secondary battery and porous membrane technology, which is applied to secondary batteries, battery electrodes, non-aqueous electrolyte storage battery electrodes, etc., can solve the problems of reaction heat generation, expansion of short circuit parts, battery short circuit, etc., and achieve improved safety and smoothness Improve and reduce the effect of thickness unevenness

Active Publication Date: 2013-05-01
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Separators made of stretched resin generally tend to shrink even at temperatures below 150°C, and short circuits in the battery are likely to occur
In addition, when a sharp-shaped protrusion such as a nail penetrates the battery (for example, during a nail penetration test), a short circuit occurs immediately, heat of reaction is generated, and the short circuit tends to expand.

Method used

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  • Slurry composition for porous film in battery, method for manufacturing porous film for secondary battery, porous film for secondary battery, electrode for secondary battery, separator for secondary battery, and secondary battery
  • Slurry composition for porous film in battery, method for manufacturing porous film for secondary battery, porous film for secondary battery, electrode for secondary battery, separator for secondary battery, and secondary battery
  • Slurry composition for porous film in battery, method for manufacturing porous film for secondary battery, porous film for secondary battery, electrode for secondary battery, separator for secondary battery, and secondary battery

Examples

Experimental program
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Effect test

Embodiment

[0222] Hereinafter, the present invention will be specifically described by showing examples, but the present invention is not limited to the following examples, and can be implemented with arbitrary changes within the scope not departing from the claims of the present invention and their equivalents. In addition, in the following description, unless otherwise specified, "%" and "part" which show an amount are based on weight.

[0223] [Evaluation method]

[0224] [Viscosity of slurry composition]

[0225] The viscosity of the slurry composition for porous membranes was measured with a cone-plate rotational viscometer (25° C., rotational speed: 6 rpm, 60 rpm, plate No.: 42) in accordance with JIS Z8803: 1991, and the viscosity was obtained 60 seconds after the start of the measurement. value.

[0226] The TI value (thixotropic index value) was calculated using the following formula from the viscosity η6 after 60 seconds at a rotational speed of 6 rpm and the viscosity η60 af...

manufacture example 1

[0274] [Production example 1. Production of water-soluble polymer A]

[0275] 249.0 g of desalted water was placed in a separable SUS flask with a capacity of 1 L equipped with a stirrer, a reflux condenser, and a thermometer, and 286 g of a 35% sodium acrylate aqueous solution was added dropwise over 3.5 hours while stirring at 90°C ( 100 g of solid content), 250 g of 40% concentration of 3-allyloxy-2-hydroxyl-1-propanesulfonic acid sodium aqueous solution (100 g of solid content), and 200 g of 5% concentration of ammonium persulfate aqueous solution. After the completion of all the dropping, the state of reflux at the boiling point was maintained for 30 minutes to complete the polymerization to obtain an aqueous solution of the water-soluble polymer A as a copolymer. As a result of analyzing the obtained aqueous solution of the water-soluble polymer A, the weight average molecular weight of the water-soluble polymer A was 6,000. The quantity of the sulfonic acid unit contai...

manufacture example 2

[0276] [Production example 2. Production of water-soluble polymer B]

[0277] Except having changed the quantity of ammonium persulfate aqueous solution into 400g, it carried out similarly to manufacture example 1, and obtained the aqueous solution of the water-soluble polymer B which is a copolymer. Analysis of the obtained aqueous solution of the water-soluble polymer B revealed that the weight-average molecular weight of the water-soluble polymer B was 3,000. The quantity of the sulfonic acid unit contained in this water-soluble polymer B was 50 weight%, and the weight ratio of the sulfonic acid group in the water-soluble polymer B was 15 weight%.

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Abstract

Provided is a slurry composition for a porous film in a battery, the composition containing: 70-99 parts by weight of non-electroconductive particles, 0.1-4 parts by weight of a water-soluble polymer having a sulfonic acid group and a weight-average molecular weight of 1000-15000, 0.1-10 parts by weight of a water-insoluble particulate polymer, and water. Also provided are a method for manufacturing a porous film for a secondary battery, a porous film for a secondary battery, an electrode for a secondary battery, a separator for a secondary battery, and a secondary battery in which the slurry composition is used.

Description

technical field [0001] The present invention relates to a slurry composition for a battery porous membrane, a porous membrane for a secondary battery using the same, and a manufacturing method thereof, and a secondary battery electrode and a separator for a secondary electrode provided with the porous membrane for a secondary battery. plates and secondary batteries. Background technique [0002] Among practical batteries, lithium-ion secondary batteries exhibit high energy density, and are mostly used in small electronic devices in particular. In addition, in addition to small applications, deployment to automobiles is also expected. Among them, a longer life and further improvement in safety of lithium ion secondary batteries are required. [0003] A lithium ion secondary battery generally includes a positive electrode and a negative electrode including an electrode mixture layer (also referred to as an electrode active material layer) carried on a current collector, a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M2/16H01M4/139H01M4/62H01M10/0566H01M50/403H01M50/417H01M50/42H01M50/429H01M50/449H01M50/489
CPCH01M10/4235H01M4/80Y02E60/122H01M2/145H01M2/1686H01M4/13H01M2/1653H01M2/1673Y02E60/10H01M50/403H01M50/46H01M50/449H01M50/417H01M50/429H01M50/489H01M50/42H01M4/62H01M10/052H01M4/622H01M50/414H01M50/491H01M50/446H01M4/139H01M4/0402
Inventor 丰田裕次郎
Owner ZEON CORP
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