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Separator for secondary cell

A technology for secondary batteries and separators, applied in the field of separators for secondary batteries, can solve the problems of shrinkage of organic separators, expansion of short-circuited parts, etc., and achieve high-efficiency manufacturing, excellent adhesion and anti-blocking properties, and high-temperature cycling. Excellent effect of characteristics and rate characteristics

Active Publication Date: 2014-12-17
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature of the battery exceeds, for example, 150°C due to instantaneous heat generation, the organic separator may shrink sharply, the positive electrode and the negative electrode may be in direct contact, and the short circuit may expand.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0297] (Manufacture of adhesive for heat-resistant layer)

[0298] 70 parts of ion-exchanged water, 0.15 parts of sodium lauryl sulfate (manufactured by Kao Chemical Co., Ltd., product name "Emal2F") as an emulsifier, and 0.5 parts of ammonium persulfate were respectively supplied to a reactor equipped with a stirrer, and the gas phase part was replaced with nitrogen. , heated up to 60°C.

[0299] On the other hand, in another container, 50 parts of ion-exchanged water, 0.5 parts of sodium dodecylbenzenesulfonate as a dispersant, 94.8 parts of butyl acrylate as a polymerizable monomer, 2 parts of acrylonitrile, and 1 part of acrylic acid, 1.2 parts of N-methylol acrylamide and 1 part of allyl glycidyl ether (AGE) to obtain a monomer mixture. This monomer mixture was continuously added to the above-mentioned reactor over 4 hours to perform polymerization. During the addition, the reaction was performed at 60°C. After completion of the addition, the reaction was further termi...

Embodiment 2

[0326] When producing the slurry for heat-resistant layers, boehmite particles (APYRAL AOH60 manufactured by Nabaltec Corporation, volume average particle diameter D50=0.9 μm, plate-shaped particles) were used as non-conductive particles. Other than that, it carried out similarly to Example 1, the slurry for heat-resistant layers, the slurry for adhesive bond layers, the separator for secondary batteries, and a secondary battery were manufactured, and each evaluated. The results are shown in Table 1.

Embodiment 3

[0328] When manufacturing the slurry for the heat-resistant layer, as the non-conductive particles, magnesium hydroxide (manufactured by Kamijima Chemical Industry Co., Ltd., volume average particle diameter D50=1.2 μm, ellipsoidal particles and polyhedrons with rounded corners) was used. mixture of shaped particles). Other than that, it carried out similarly to Example 1, the slurry for heat-resistant layers, the slurry for adhesive bond layers, the separator for secondary batteries, and a secondary battery were manufactured, and each evaluated. The results are shown in Table 1.

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Abstract

Provided are: a separator for a secondary cell, the separator having good heat resistance, high adhesion to an electrode active material layer laminated on the collector, and high blocking resistance; and a secondary cell having the separator for a secondary cell. This separator for a secondary cell has an organic separator layer, a heat resistance layer formed adjacent to at least one surface of the organic separator layer, and an adhesive layer formed on the heat resistance layer, the heat resistance layer containing non-conductive particles and a binder, and the adhesive layer including a particulate polymer having a glass transition temperature (Tg) of 10 to 100 DEG C.

Description

technical field [0001] The present invention relates to a secondary battery separator usable for lithium ion secondary batteries and the like. Background technique [0002] In recent years, portable terminals such as notebook computers, mobile phones, and PDAs (Personal Digital Assistants) have spread remarkably. Lithium-ion secondary batteries and the like are often used as secondary batteries used for power supplies of these portable terminals. Since portable terminals are required to be more comfortable in portability, miniaturization, thinning, weight reduction, and high performance have been rapidly developed. As a result, portable terminals have been used in various situations. In addition, the battery is also required to be miniaturized, thinner, lighter, and higher in performance similarly to the portable terminal. [0003] Lithium-ion secondary batteries perform charging and discharging operations as follows: when charging, lithium is dissolved into the electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0566C09D7/61H01M50/403H01M50/414H01M50/457H01M50/489
CPCH01M10/0566H01M10/052H01M50/461H01M50/403H01M50/414H01M50/457H01M50/489C09D5/028C08K3/22C08K2003/2217C08K2003/2227C09D7/61Y02E60/10H01M50/449H01M50/443H01M50/42H01M50/463H01M10/056H01M10/0525H01M2220/30
Inventor 丰田裕次郎佐佐木智一
Owner ZEON CORP
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