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Separator for secondary cell, method for manufacturing separator for secondary cell, and secondary cell

A technology for secondary batteries and manufacturing methods, which is applied to secondary batteries, secondary battery components, separators/films/diaphragms/spacer elements, etc., can solve problems such as poor cycle characteristics, and achieve low-cost, high-efficiency output, high volume effects

Active Publication Date: 2017-08-01
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with the increase in capacity and output of lithium-ion batteries in recent years, not only the above characteristics, but also gaps between electrodes and separators for secondary batteries due to repeated charge and discharge, in order to prevent deterioration of cycle characteristics, Adhesion to electrodes is required for secondary battery separators

Method used

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  • Separator for secondary cell, method for manufacturing separator for secondary cell, and secondary cell
  • Separator for secondary cell, method for manufacturing separator for secondary cell, and secondary cell

Examples

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Embodiment 1

[0175]A resin composed of a copolymer of vinylidene fluoride and hexafluoropropylene (polyvinylidene fluoride-based resin, vinylidene fluoride content of 95 mol%, carboxylic acid group-containing acidic functional group) was dissolved in a relative 9,000 parts by mass of acetonitrile was added to 100 parts by mass of the copolymer, and 11 parts by mass of water was added to 100 parts by mass of acetonitrile in this solution to prepare a polyvinylidene fluoride-based resin solution. The polyvinylidene fluoride-based resin solution at 76°C was continuously added to a tank of 5,000 parts by mass of water at room temperature (hereinafter, "particle tank") with respect to 100 parts by mass of the copolymer to obtain a particle solution. .

[0176] Next, while separately adjusting the polyvinylidene fluoride-based resin solution (76° C.) and 5,000 parts by mass of water (normal temperature) with respect to 100 parts by mass of the copolymer, they were simultaneously added dropwise a...

Embodiment 2

[0180] Except having made the weight average molecular weight of polyvinylidene fluoride-type resin into 800,000, it carried out similarly to Example 1, and obtained the separator for secondary batteries of this invention.

Embodiment 3

[0182] The weight-average molecular weight of the polyvinylidene fluoride resin is 600,000, and the average particle diameter of the fluororesin particles is 0.20 μm, except that, in the same manner as in Example 1, the secondary battery separator of the present invention is obtained. .

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Abstract

The purpose of the present invention is to provide a separator for a secondary cell at a low cost, with which it is possible to achieve adhesion with an electrode and dimensional stability. The present invention is a separator for a secondary cell in which a porous layer is laminated on at least one surface of a porous substrate, the porous layer containing: fluorine resin particles having an average grain diameter of 0.01-1.00 [mu]m, the fluorine resin particles using a fluorine resin having a weight-average molecular weight of 10,000-5,000,000; and inorganic particles having an average grain diameter of 0.10-5.0 [mu]m.

Description

technical field [0001] The invention relates to a diaphragm for a secondary battery, a method for manufacturing the diaphragm for a secondary battery, and a secondary battery. Background technique [0002] Secondary batteries such as lithium-ion batteries are widely used in portable digital devices such as mobile phones, notebook computers, digital cameras, digital video cameras, and portable game consoles. The use of power sources such as power vehicles is expanding. [0003] Lithium-ion batteries generally have a structure in which a separator for secondary batteries and an electrolyte are interposed between a positive electrode and a negative electrode. Negative active material. [0004] As the secondary battery separator, a polyolefin-based porous substrate can be used. The characteristics required for separators for secondary batteries include: the ability to contain an electrolyte in a porous structure and allow ions to flow; The property of stopping the flow of io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08J3/14H01M50/403H01M50/417H01M50/42H01M50/426H01M50/429H01M50/443H01M50/451
CPCC08J3/14Y02E60/10H01M50/446H01M50/461H01M50/429H01M50/417H01M50/403H01M50/451H01M50/443H01M50/426H01M50/42C08J5/2237C08J5/225H01M10/0525Y02P70/50H01M50/449H01M50/491H01M50/463H01M10/02H01M10/10
Inventor 甲斐信康伊藤喜代彦
Owner TORAY IND INC
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