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Separator for non-aqueous batteries, non-aqueous battery using same, and production method for separator for non-aqueous batteries

一种电池、非水的技术，应用在非水电解质蓄电池、非水电解质、电池组零部件等方向，能够解决电解液起火性担忧、电池温度升高、设备热损坏等问题，达到操作性良好、初始电阻低、耐热性优异的效果

Inactive Publication Date: 2012-06-13
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] As the electrolyte solution of this non-aqueous battery, it is known that LiPF 6 、LiCF 3 SO 3 , LiClO, LiBF 4 etc. are dissolved in organic solvents such as ethylene carbonate, propylene carbonate, acetonitrile, γ-butyrolactone, 1,2-dimethoxyethane, tetrahydrofuran as electrolytes to obtain electrolyte solutions, but these electrolyte solutions have Risk of fire at high temperatures
[0006] Secondly, in non-aqueous batteries composed of the above materials, there are cases where abnormal current flows due to short circuit, wrong connection of positive / negative electrodes, etc., resulting in a significant rise in battery temperature. Devices with non-aqueous batteries cause heat damage and are also a concern in terms of electrolyte fire potential

Method used

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  • Separator for non-aqueous batteries, non-aqueous battery using same, and production method for separator for non-aqueous batteries
  • Separator for non-aqueous batteries, non-aqueous battery using same, and production method for separator for non-aqueous batteries
  • Separator for non-aqueous batteries, non-aqueous battery using same, and production method for separator for non-aqueous batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] (1) Production of heat-resistant polymer fiber layer (B)

[0137] Solvent-spun cellulose fibers of 1.7 dtex and 3 mm in length (manufactured by Cotoluses, Tencel) were beaten by a fiberizer and a pulper to obtain a CSF0 ml fibrillated product. This fiber was used as the main fiber, and ethylene-vinyl alcohol fiber (manufactured by Kuraray Co., Ltd., "S030") was added as the binder fiber in such an amount that the mass ratio of main fiber: binder fiber was 80:20. the slurry.

[0138] Use a cylinder paper machine to make paper from this slurry, dry it at a dryer temperature of 130°C, and produce a weight per square meter of 10.9g / m 2 , A heat-resistant polymer fiber layer with a thickness of 15 μm.

[0139] (2) Formation of low melting point polymer fiber layer (A)

[0140] First, an ethylene-vinyl alcohol copolymer (EVOH: EVAL-G manufactured by Kuraray Co., Ltd.) was put into a DMSO solvent so as to be 14% by mass, and then left to dissolve at 25° C. to obtain a spinn...

Embodiment 2

[0144] It produced similarly to Example 1 except having used polypropylene instead of the ethylene-vinyl alcohol copolymer as the low-melting-point polymer which forms the low-melting-point polymer fiber layer of Example 1 mentioned above.

[0145] Specifically, when producing low-melting nanofibers, a polypropylene resin (manufactured by Grand Polymer Co., Ltd.: B101) was melt-kneaded at 300° C. using a twin-screw extruder to obtain a spinning stock solution. figure 1 The spinning device was used for electrospinning.

[0146] In the spinning device, a needle with an inner diameter of 0.3 mm was used as the metal mouth 4, and the distance between the metal mouth 4 and the forming sheet take-up device 7 was 6 cm. In addition, the heat-resistant polymer fiber layer obtained in (1) of Example 1 was wound up on the forming sheet take-up device 7 . Then, the stock solution is extruded from the metal port with a conveyor speed of 0.1m / min and a prescribed supply amount, and a 40kV ...

Embodiment 3

[0148] It produced similarly to Example 2 except having changed the low melting point polymer of the low melting point polymer fiber layer of Example 2 into polyethylene (Mitsui Chemicals: 5202B). Table 1 shows the performance of the obtained separator.

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Abstract

Disclosed is a separator for non-aqueous batteries which not only has a shutdown mechanism, but can also achieve a higher output and has short-circuit resistance. The separator is configured of a laminate which is provided with a low melting point polymer-fibre layer (A), formed of a low melting point polymer having a melting point of 100-200 DEG C, and a heat-resistant polymer-fibre layer (B), formed above the low melting point polymer-fibre layer (A) and formed of a heat infusible polymer or a high melting point polymer, having a melting point of over 200 DEG C. The low melting point polymer-fibre layer (A) includes low melting point polymer fibres having a fibre diameter not greater than 1000nm; the heat-resistant polymer-fibre layer (B) is formed from the heat resistant polymers and includes an amalgam of nanofibres and non-nanofibres.

Description

[0001] Associate application [0002] This application claims priority from Japanese Patent Application No. 2009-214216 filed on September 16, 2009 in Japan, which is incorporated by reference in its entirety as a part of this application. technical field [0003] The present invention relates to a battery separator usable as a constituent material of a nonaqueous battery and a nonaqueous battery using the same, and to a method for producing the battery separator. Background technique [0004] In recent years, non-aqueous batteries such as lithium batteries (lithium primary batteries) and lithium-ion rechargeable batteries have attracted attention as lightweight, high-power, and high-energy power sources in response to the wirelessization of electronic devices. For example, cylindrical lithium rechargeable batteries and the like are used in mobile phones, notebook computers, etc., and thus are mass-produced, and the production volume thereof is increasing year by year. Next...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/414H01M50/417H01M50/423H01M50/426H01M50/429H01M50/449H01M50/489
CPCY02E60/12H01M2/1686H01M10/05H01M2/145H01M2/162Y02E60/10H01M50/44H01M50/403H01M50/449H01M50/429H01M50/417H01M50/414H01M50/489H01M50/426H01M50/423H01M2300/0017H01M50/411H01M50/463Y02P70/50
Inventor 早川友浩林英男镰田英树细谷敬能川井弘之
Owner KURARAY CO LTD
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