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Secondary-battery porous-membrane slurry, secondary-battery porous membrane, secondary-battery electrode, secondary-battery separator, secondary battery, and method for manufacturing secondary-battery porous membrane

A secondary battery, porous membrane technology, applied in the field of secondary battery porous membrane slurry, can solve problems such as explosion, short circuit of positive and negative electrodes, and achieve the effects of excellent dispersibility, prevention of detachment, and excellent strength

Active Publication Date: 2013-08-21
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there may be a short circuit between the positive electrode and the negative electrode, an explosion due to the discharge of electric energy, etc.

Method used

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  • Secondary-battery porous-membrane slurry, secondary-battery porous membrane, secondary-battery electrode, secondary-battery separator, secondary battery, and method for manufacturing secondary-battery porous membrane
  • Secondary-battery porous-membrane slurry, secondary-battery porous membrane, secondary-battery electrode, secondary-battery separator, secondary battery, and method for manufacturing secondary-battery porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0300]

[0301] 100 parts of styrene, 1.0 parts of sodium dodecylbenzenesulfonate, 100 parts of ion-exchanged water, and 0.5 parts of potassium persulfate were placed in a reactor equipped with a stirrer, and polymerized at 80° C. for 8 hours. Thus, an aqueous dispersion of seed polymer particles A having an average particle diameter of 60 nm was obtained.

[0302]

[0303] Put the aqueous dispersion of the seed polymer particles A obtained in the step (1) into a reactor with a stirrer as 2 parts, dodecylbenzene, and 0.2 parts of sodium sulfonate, 0.5 parts of potassium persulfate, and 100 parts of ion-exchanged water were mixed to obtain a mixture, and the temperature was raised to 80°C. On the other hand, 97 parts of styrene, 3 parts of methacrylic acid, 4 parts of t-dodecyl mercaptan, 0.5 parts of sodium dodecylbenzenesulfonate, and 100 parts of ion-exchanged water were mixed in another container to prepare a single A dispersion of a mixture of solids. The dispersion ...

Embodiment 2

[0330] On one side of the negative electrode active material layer side of the negative electrode obtained in the operation (8) of Example 1, apply the porous film slurry obtained in the operation (6) of Example 1 and obtain the slurry layer so that it completely covers the negative electrode active material layer and the thickness of the dried porous film is 5 μm. The slurry layer was dried at 50° C. for 10 minutes to form a porous membrane, thereby obtaining a negative electrode with a porous membrane. The obtained negative electrode with a porous membrane had a layer structure of (porous membrane) / (negative electrode active material layer) / (copper foil). The uniformity, reliability, and powder falling properties of the porous membrane of the obtained negative electrode with a porous membrane were evaluated. The results are shown in Table 1.

[0331] Instead of the organic separator with a porous membrane obtained in the step (9) of Example 1, an organic separator (a singl...

Embodiment 3

[0334] Instead of the acrylic polymer particles A obtained in the step (4) of Example 1, the following acrylic polymer particles A were used. In addition, instead of the acrylic polymer particles B obtained in the step (5) of Example 1, the following acrylic polymer particles B were used. Except for using the acrylic polymer particles A and the acrylic polymer particles B to produce a porous membrane slurry, the same operation as in Example 1 was performed to obtain and evaluate an organic separator with a porous membrane and a secondary battery. . The results are shown in Table 1. In addition, the weight ratio of the acrylic polymer particles A to the acrylic polymer particles B in the porous film slurry (acrylic polymer particles A / acrylic polymer particles B) was 1, and the sulfonic acid in the binder The weight ratio (sulfonic acid group / epoxy group) of the group to the epoxy group was 1.7.

[0335]

[0336] Put 300 parts of ion-exchanged water, 89.0 parts of n-butyl ...

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Abstract

To provide a high-strength, highly uniform secondary-battery porous membrane that is capable of improving the cycle characteristics of a resulting secondary battery and is manufactured using a secondary-battery porous-membrane slurry that exhibits excellent coating performance and contains highly-dispersed nonconductive particles. Also, to provide a secondary-battery electrode and secondary-battery separator having good shutdown functionality. This secondary-battery porous-membrane slurry is characterized by containing organic-polymer-containing nonconductive particles, a binder, and a solvent, and is further characterized in that said binder contains particles (A) of an acrylic polymer that has a sulfonic acid group and particles (B) of an acrylic polymer that has an epoxy group.

Description

technical field [0001] The present invention relates to a secondary battery porous membrane slurry, and in further detail, relates to a method for manufacturing the surface of an electrode or a separator formed in a lithium ion secondary battery, which has high reliability and can contribute to the cycle of the battery. A secondary battery porous membrane slurry for a secondary battery porous membrane with improved properties. In addition, the present invention relates to a secondary battery electrode, a secondary battery separator, and a secondary battery including such a secondary battery porous membrane. Background technique [0002] Among practical batteries, lithium-ion secondary batteries have the highest energy density, and are often used in small electronic devices in particular. In addition, in addition to small applications, utilization in automobiles is also expected. Among them, a longer life and further improvement in safety of lithium ion secondary batteries ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M4/02H01M4/13H01M10/04H01M10/058H01M50/403H01M50/417H01M50/42H01M50/443H01M50/489H01M50/491
CPCY02E60/10H01M50/403Y02P70/50H01M50/417H01M50/491H01M50/443H01M50/489H01M50/42H01M4/13H01M10/052
Inventor 金田拓也石井琢也
Owner ZEON CORP
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