Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Battery separator

By stacking a modified porous layer on a polyolefin microporous membrane and using materials such as polyethylene resin and fluororesin, the problem of insufficient thermal shrinkage resistance of battery separators within a temperature range has been solved, and the electrode adhesion and separator properties have been improved. overall performance, reducing the risk of short circuits.

Active Publication Date: 2016-08-17
TORAY IND INC
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although they have adhesion to electrodes, their shutdown characteristics are not sufficient
[0013] That is, the current situation is that a laminated polyolefin microporous membrane that fully exhibits the shutdown characteristics of polyolefin microporous membranes and has both shutdown characteristics and electrode adhesion has not been obtained so far.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Battery separator
  • Battery separator
  • Battery separator

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0064] (1) Preparation process of polyolefin resin solution

[0065] The polyolefin resin solution is prepared by melt-kneading after adding a suitable film-forming solvent to the polyolefin resin. Various additives such as the above-mentioned inorganic fillers, antioxidants, ultraviolet absorbers, anti-blocking agents, pigments, and dyes can be added to the polyolefin resin solution as necessary within a range that does not impair the effects of the present invention. For example, micronized silicic acid can be added as a pore former.

[0066] As the film-forming solvent, either a liquid solvent or a solid solvent can be used. Examples of the liquid solvent include aliphatic or cyclic hydrocarbons such as nonane, decane, decalin, p-xylene, undecane, dodecane, and liquid paraffin, and mineral oil fractions having boiling points corresponding to these. In order to obtain a gel-like sheet having a stable solvent content, it is preferable to use a nonvolatile liquid solvent suc...

Embodiment 1

[0193] The mass average molecular weight (Mw) is 2.5×10 6 of ultra-high molecular weight polyethylene (UHMwPE) 30% by mass and Mw of 3.0×10 5 100 parts by mass of a polyethylene (PE) composition composed of 70 mass % of high-density polyethylene (HDPE) is dry mixed with tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl] )-propionate]methane 0.375 parts by mass. For the PE composition composed of UHMWPE and HDPE, the measured ΔHm (≤125°C) was 14%, T (50%) was 132.5°C, melting point was 135°C, and crystal dispersion temperature was 100°C.

[0194] The Mw of UHMwPE and HDPE was obtained by gel permeation chromatography (GPC) method under the following conditions (the same below).

[0195] Measurement device: GPC-150C manufactured by Waters Corporation

[0196] Column: Shodex UT806M manufactured by Showa Denko Co., Ltd.

[0197] ·Column temperature: 135℃

[0198] Solvent (mobile phase): o-dichlorobenzene

[0199] Solvent flow rate: 1.0mL / min

[0200] ·Sample concentra...

Embodiment 2

[0211] In the film formation of the polyethylene microporous film of Example 1, the polyethylene composition was adjusted while maintaining the ratio of the input amount of the polyethylene composition to the screw rotation speed Ns at Q / Ns=0.3 kg / h / rpm. The input amount of the material and the rotational speed of the screw were used to prepare a polyethylene microporous membrane (b) with a thickness of 9 μm and an airtightness of 70 sec / 100 ccAir. Next, a modified porous layer was laminated on one side of the polyethylene microporous membrane (b) by the same method as in Example 1, to obtain a battery separator having a final thickness of 11 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
heat of fusionaaaaaaaaaa
coating thicknessaaaaaaaaaa
linear shrinkageaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a battery separator in which a modified porous layer is laminated on at least one side of a polyolefin microporous film, wherein the polyolefin microporous film contains a polyethylene resin, (a) Close The temperature is 135°C or less, (b) the air impermeability change rate is 1×104 sec / 100cc / °C or more, and (c) the shrinkage rate in the transverse direction at 130°C is 20% or less. The present invention provides a device that has high physical property stability up to the start of closing and a rate of change in air tightness after the start of closing, is excellent in heat shrinkage resistance in the temperature range from the closing start temperature to the closing temperature, and has a low closing temperature. Battery separator with excellent electrode adhesion.

Description

Technical field [0001] The present invention relates to a battery separator, and in particular to a separator that has high physical stability until the start of shutdown and a high rate of change in air resistance after the start of shutdown, and a temperature from the shutdown start temperature to the shutdown temperature. A battery separator with excellent heat shrinkage resistance and low shutdown temperature within the range. Background technique [0002] One of the main uses of polyethylene microporous membranes is battery separators, which have various required properties. In particular, separators for lithium ion batteries are required not only to have excellent mechanical properties and permeability, but also to have the ability to block the pores due to battery heat to stop the battery reaction (shutdown characteristics), and to be able to operate at temperatures exceeding the shutdown temperature (shutdown temperature). Properties to prevent film damage (meltdown...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/426H01M50/449H01M50/489
CPCH01M50/446H01M50/449H01M50/426H01M50/489H01M50/417B01D71/261Y02E60/10
Inventor 水野直树君岛康太郎清水健
Owner TORAY IND INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com