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Separator for lithium ion cell

A lithium-ion battery and separator technology, which is applied in the manufacture of battery pack parts, non-aqueous electrolyte storage batteries, and electrolyte storage batteries, etc., which can solve the problem that it is difficult to fully ensure the insulation between the positive electrode material and the negative electrode material, the leakage current cannot be obtained, and the leakage current cannot be achieved. and other problems, to achieve the effect of less leakage current, low internal resistance, and small leakage current

Active Publication Date: 2015-04-15
MITSUBISHI PAPER MILLS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a separator in which inorganic particles are coated on a base material, depending on the dispersion state of the inorganic particles or the coating method, pinholes may be generated, and it is difficult to sufficiently secure the positive electrode material and the negative electrode when the separator is thinned. Insulation between materials may increase leakage current
[0009] In addition, in a separator in which a porous body containing inorganic particles and an organic binder is provided on or in the nonwoven fabric, when the amount of the porous body (hereinafter may be simply referred to as "coating amount") is small, there may be problems. There is a problem of obtaining a battery with a small leakage current, and there is a problem of not being able to obtain a separator with a thin thickness and low internal resistance when the coating amount is large
In order to solve this problem, a separator in which two coating layers with different pore diameters are laminated has been proposed (for example, refer to Patent Document 6), but it has not yet reached a product where leakage current and internal resistance coexist at a high level.

Method used

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  • Separator for lithium ion cell
  • Separator for lithium ion cell
  • Separator for lithium ion cell

Examples

Experimental program
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Effect test

Embodiment 1

[0111] The shape is amorphous inorganic particles ( figure 1 , aluminum oxide hydrate), converted into solid content of 0.2 parts of carboxymethylcellulose sodium salt (1% aqueous solution B viscosity 200mPa·s, degree of etherification 0.65) mixed with a homogenizer, stirred, and then mixed into The solid content is 0.2 parts of carboxymethylcellulose sodium salt (1% aqueous solution B viscosity 7000 mPa·s, etherification degree 0.7) and stirred, followed by mixing styrene butadiene rubber with a solid content of 6 parts The latex was mixed and stirred, and ion-exchanged water was further added to prepare a coating solution for a porous body with a solid content concentration of 20%. On the non-woven fabric substrate 1 after the above-mentioned thermal calendering treatment by a gravure coater, so that the dry solid content is 10.2g / m 2 In the same manner, the coating solution was uniformly coated on one surface of the nonwoven fabric substrate 1 and dried to obtain a separat...

Embodiment 2

[0131] Inorganic particles ( Figure 4 , alumina hydrate) as the inorganic particles, except that the coating solution was prepared in the same manner as in Example 1, coated and dried to obtain a porous body with a dry solid content of 10.2 g / m 2 , A separator with a thickness of 25.2 μm.

Embodiment 3

[0133] Inorganic particles ( Figure 5 , aluminum oxide hydrate) as inorganic particles, except that the coating solution was prepared in the same manner as in Example 1, coated and dried to obtain a porous body with a dry solid content of 10.5 g / m 2 , A separator with a thickness of 26.0 μm.

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Abstract

A separator for a lithium ion cell, the separator comprising at least a porous body principally made of inorganic particles, wherein the separator is characterized in that the organic particles are of amorphous configuration. The performance of the separator for a lithium ion cell is such that internal resistance is low, pinholing and flaking is minimal, and current leakage is small.

Description

technical field [0001] The present invention relates to a separator for a lithium ion battery (hereinafter may be simply referred to as a "separator"). Background technique [0002] A lithium ion battery, one of electrochemical elements, is a secondary battery characterized by high energy density. It is widely used as a power supply for portable electronic devices such as mobile phones, portable music players, and notebook personal computers. In addition, the use of lithium-ion batteries in large-scale equipment such as electric bicycles, hybrid energy vehicles, and electric vehicles is becoming more and more widespread. Therefore, lithium-ion batteries are required to have high capacity, high-current charge-discharge characteristics, and other performances. However, lithium-ion batteries are known to be non-aqueous batteries. Therefore, compared with aqueous batteries, there is a higher risk of smoke, fire, rupture, etc., and improvement in safety is required. [0003] I...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/434H01M50/443H01M50/489
CPCH01M2/1646H01M10/058H01M50/443H01M50/489H01M50/434Y02E60/10
Inventor 渡边宏明加藤真加藤隆久增田敬生高滨信子落合贵仁加藤加寿美笠井誉子
Owner MITSUBISHI PAPER MILLS LTD
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