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Porous film for secondary battery, production method and use

A secondary battery and porous membrane technology, applied in secondary batteries, battery electrodes, battery components, etc., can solve the problems of bad influence on battery performance and difficulty in reducing content, and achieve uniform film thickness distribution and strength distribution, long service life Long-lasting, avoid powder falling effect

Active Publication Date: 2015-10-21
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, inorganic particulate products inevitably contain moisture and metal ions, and it is difficult to reduce their content
If water and metal ions are mixed into the porous membrane, it will have a negative impact on the performance of the battery. Therefore, the use of inorganic particles to further improve the performance of the battery is limited.

Method used

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  • Porous film for secondary battery, production method and use
  • Porous film for secondary battery, production method and use
  • Porous film for secondary battery, production method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0330] (1-1. Production of seed polymer particles A)

[0331] In a reactor equipped with a stirrer, 0.06 parts of sodium lauryl sulfate, 0.23 parts of ammonium persulfate, and 100 parts of ion-exchanged water were put and mixed to prepare mixture A, and the temperature was raised to 80°C.

[0332] On the other hand, 93.8 parts of butyl acrylate, 2.0 parts of methacrylic acid, 2.0 parts of acrylonitrile, 1.0 parts of allyl glycidyl ether, 1.2 parts of N-methylol acrylamide, and dodecyl were mixed in another container. 0.1 part of sodium sulfate and 100 parts of ion-exchanged water were used to prepare a dispersion of the monomer mixture 1 .

[0333] This dispersion of the monomer mixture 1 was continuously added to the above obtained mixture A over 4 hours and allowed to polymerize. The temperature of the reaction system during the continuous addition of the dispersion of the monomer mixture 1 was maintained at 80°C, and the reaction was carried out. After the continuous addi...

Embodiment 2

[0359] (2-1. Production of seed polymer particles B)

[0360] In a reactor equipped with a stirrer, 0.06 parts of sodium lauryl sulfate, 0.23 parts of ammonium persulfate, and 100 parts of ion-exchanged water were put and mixed to prepare mixture B, and the temperature was raised to 80°C.

[0361] On the other hand, 93.8 parts of butyl acrylate, 2.0 parts of methacrylic acid, 2.0 parts of acrylonitrile, 1.0 parts of allyl glycidyl ether, 1.2 parts of N-methylol acrylamide, and dodecyl were mixed in another container. 0.1 part of sodium sulfate, 2.0 parts of t-dodecyl mercaptan, and 100 parts of ion-exchanged water were used to prepare a dispersion of monomer mixture 2.

[0362] The dispersion of the monomer mixture 2 was continuously added to the mixture B obtained above to polymerize over 4 hours. The temperature of the reaction system was maintained at 80° C. during the continuous addition of the dispersion of the monomer mixture 2, and the reaction was carried out. After ...

Embodiment 3

[0369] (3-1. Production of non-conductive particles C)

[0370] In a reactor equipped with a stirrer, 20 parts of the water dispersion of the seed polymer particles A obtained in the step (1-1) of Example 1 was placed on the basis of the solid content (that is, the weight basis of the seed polymer particles A). , 100 parts of ethylene glycol dimethacrylate (Kyoeisha Chemical Co., Ltd., product name: Light EsterEG) as a monomer, 1.0 parts of sodium dodecylbenzenesulfonate, and tert-butyl permethacrylate as a polymerization initiator 4.0 parts of oxy-2-ethylhexanoate (manufactured by NOF Corporation, trade name: PERBUTYL O), 50 parts of cyclohexanol, and 200 parts of ion-exchanged water were stirred at 35° C. for 12 hours to polymerize seeds The polymer particles A completely absorb the monomers and polymerization initiators. Then, it was polymerized at 90 degreeC for 5 hours. Then, steam is introduced to remove the non-reactive solvent, unreacted monomers and initiator decomp...

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Abstract

A porous membrane for a secondary battery inclulding non-conductive particles and a binder for a porous membrane, wherein the non-conductive particles are spherical polymer particles having a rough surface, the particles satisfy the expression 1.2 ‰¤ (SB) / (SD) ‰¤ 5.0 (1) (wherein SB represents an actual specific surface area of the particles and SD means a theoretical specific surface area of the particles), an arithmetic average of shape factor of the particles is 1.20 or less, and the particles include 50% by weight or more of a polyfunctional (meth)acrylic monomer unit; a method for producing the same; and an electrode, a separator and a battery having the same.

Description

technical field [0001] The present invention relates to a porous film for a secondary battery, a method for producing the same, and an electrode, a separator, and a secondary battery using the porous film. Background technique [0002] Among practical batteries, lithium ion secondary batteries show the highest energy density, and are widely used in small electronic products in particular. In addition, it is also expected to be used in automotive applications. For use in these applications, a lithium ion secondary battery having a large capacity, a long life, and high safety is further desired. [0003] In order to prevent a short circuit between the positive electrode and the negative electrode, an organic separator is generally used in a lithium ion secondary battery. Ordinary organic separators are made of polyolefin-based materials such as polyethylene or polypropylene, and have physical properties that melt at 200° C. or lower. Therefore, when the battery reaches a hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M2/14H01M4/13H01M4/139H01M4/24H01M4/32H01M50/406H01M50/417H01M50/42H01M50/449H01M50/489H01M50/491
CPCH01M2/166B05D1/18B05D1/30C08F220/18H01M2/145H01M2/1653H01M2/1666H01M2/1686H01M10/0525H01M10/4235C08F220/1804H01M50/406H01M50/42H01M50/491H01M50/417H01M50/489C08F220/06C08F220/44C08F220/58C08F216/1416Y02E60/10C08F222/103C08F222/102C08F212/08H01M50/443H01M50/403H01M4/13Y02P70/50H01M50/446
Inventor 金田拓也
Owner ZEON CORP
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