Porous membrane for secondary battery, and secondary battery

A secondary battery and porous membrane technology, applied in the field of porous membranes, can solve problems such as explosion, and achieve the effect of improving output characteristics and long-term cycle characteristics

Active Publication Date: 2012-08-08
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyolefin-based organic separators have the physical property of melting below 200°C, when the battery becomes high temperature due to internal and / or external stimuli, volume changes such as shrinkage or melting may occur, and as a result, there may be There are concerns about explosions due to short-circuiting of the positive and negative electrodes, discharge of electric energy, etc.

Method used

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  • Porous membrane for secondary battery, and secondary battery
  • Porous membrane for secondary battery, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0206] As the polymer particles A-1, polystyrene particles (PP-30-10 manufactured by Spherotech Corporation) having a number average particle diameter of 3 μm and a glass transition temperature of 100° C. were used.

[0207]

[0208] Add 12 parts of n-butyl acrylate, 0.12 parts of sodium lauryl sulfate, and 79 parts of ion-exchanged water into polymerization kettle A, add 0.2 parts of ammonium persulfate as a polymerization initiator, and 10 parts of ion-exchanged water, heat to 60°C and stir After 90 minutes, add 88 parts of n-butyl acrylate, 0.9 parts of sodium lauryl sulfate, and 46 parts of ion-exchanged water to other polymerization kettle B and stir, and add the prepared emulsion from polymerization kettle B to In the polymerization tank A, thereafter, stirring was performed for about 120 minutes, and when the monomer consumption reached 95%, the reaction was completed by cooling to obtain an aqueous dispersion of polymer particles B-1. The glass transition temperature...

Embodiment 2

[0220] As the polymer particles A, polystyrene particles (manufactured by Spherotech, PP-60-10, hereinafter sometimes referred to as "polymer particles A-2") with a glass transition temperature of 100° C. and a number average particle diameter of 7 μm were used. ), except that, in the same manner as in Example 1, the slurry for the porous membrane, the electrode with the porous membrane, and the coin-shaped lithium ion secondary battery were obtained, and the output characteristics and cycle characteristics were measured. The results are shown in Table 1.

Embodiment 3

[0222] As the polymer particles A, polystyrene particles with a glass transition temperature of 100° C. and a number average particle diameter of 0.5 μm (manufactured by Spherotech, PP-05-10, hereinafter sometimes referred to as “polymer particles A-3 "), except that, in the same manner as in Example 1, the slurry for the porous membrane, the electrode with the porous membrane, and the coin-type lithium ion secondary battery were obtained, and the output characteristics and cycle characteristics were measured. The results are shown in Table 2.

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Abstract

Disclosed is a porous membrane for a secondary battery, which has further improved output characteristics and long-term cycle characteristics when compared with conventional porous membranes. The porous membrane for a secondary battery is used for a lithium ion secondary battery or the like. Specifically disclosed is a porous membrane for a secondary battery, which contains polymer particles (A) that have a number average particle diameter of 0.4 [mu]m or more but less than 10 [mu]m and a glass transition temperature of 65 DEG C or more and polymer particles (B) that have a number average particle diameter of 0.04 [mu]m or more but less than 0.3 [mu]m and a glass transition temperature of 15 DEG C or less. It is preferable that the polymer particles (B) have a crystallization degree of 40% or less and a main chain structure that is composed of a saturated structure.

Description

technical field [0001] The present invention relates to a porous film, and more specifically, to a porous film formed on an electrode surface of a lithium ion secondary battery and contributing to improvement of film uniformity or flexibility and cycle characteristics of the battery. The present invention also relates to a secondary battery electrode having the porous membrane. Background technique [0002] Lithium-ion secondary batteries show the highest energy density among practical batteries, and are mostly used in small electronic equipment applications. In addition, expansion into automotive applications is also expected, and higher capacity, longer life, and further improvement in safety are urgently desired. [0003] In lithium ion secondary batteries, polyolefin-based organic separators such as polyethylene and polypropylene are generally used in order to prevent short circuits between the positive electrode and the negative electrode. Since polyolefin-based organ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/02H01M4/13H01M10/0566H01M50/403H01M50/406H01M50/417H01M50/423H01M50/426H01M50/491
CPCY02E60/12H01M2/145H01M2/1653H01M10/052Y02E60/10H01M50/403Y02P70/50H01M50/417H01M50/406H01M50/491H01M50/423H01M50/426H01M10/058H01M50/443H01M50/489H01M50/414H01M50/46H01M10/0525
Inventor 胁坂康寻吉田直树
Owner ZEON CORP
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