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Separator with increased puncture resistance

A diaphragm and organic technology, applied in the field of diaphragm, can solve the problems of increasing battery resistance and reducing porosity, and achieve high tear strength, improved mechanical stability, and high permeability

Inactive Publication Date: 2013-04-03
CARL FREUDENBERG KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this will reduce the porosity and increase the electrical resistance in the battery because it is difficult for the electrolyte to diffuse through the separator

Method used

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  • Separator with increased puncture resistance
  • Separator with increased puncture resistance
  • Separator with increased puncture resistance

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] 221 parts of 70% alumina dispersion (Al 2 o 3 )(d 50 =0.7 μm) were added to 251 parts of a 2.5% hydroxymethylcellulose solution and stirred for 30 minutes. Then 10 parts of alkylphenol ethoxylates were added, followed by 24 parts of a 48% colloidal NBR dispersion (pH=9.6; TG=-12°C (glass transition temperature)), while stirring. The solution was stirred for 2 hours and tested for stability for at least 24 hours. The viscosity of the obtained solution was 290 cP. The content of flexible organic binder particles on the coating is 6.3%.

[0084] coating:

[0085] Apply a 65cm wide PET non-woven fabric (thickness: 22μm, weight per unit area: 11g / m2) by roller coating method 2 ) to continuously coat the above solution, and then dry it without contact at a temperature of 125°C. Obtain a weight per unit area of ​​49g / m 2 And a coated non-woven fabric with a thickness of 40 μm. The average pore size of the coated nonwoven was 0.2 μm.

example 2

[0087] 46594 parts of 66% alumina dispersion (Al 2 o 3 , d 5０ = 2.5 μm) were added to 98010 parts of a 1.5% hydroxymethylcellulose solution and stirred for 30 minutes. Then add 3000 parts of alkylphenol ethoxylates, followed by adding 5396 parts of 48% flexible colloidal NBR dispersion (pH=9.6; T G = -12°C) while stirring. The solution was stirred for 3 hours and tested for stability for at least 24 hours. The viscosity of the obtained solution was 100 cP. The solids content of the flexible organic binder particles on the coating was 7.4%.

[0088] coating:

[0089] A 58cm wide PET non-woven fabric (thickness: 19μm, weight per unit area: 11g / m2) was applied by roller coating method. 2 ) continuously coat the above solution, and then dry it at 120°C. Obtain a weight per unit area of ​​35g / m 2 And impregnated non-woven fabric with a thickness of 36 μm. The average pore diameter is 0.2 μm.

example 3

[0091] 221 parts of 65% alumina suspension (Al 2 o 3 , d 50 = μm) was added to 251 parts of a 2% hydroxymethylcellulose solution and stirred for 30 minutes. Then 5 parts of alkylphenol ethoxylates were added, followed by 40 parts of a 48% colloidal NBR dispersion while stirring. The solution was stirred for 3 hours and tested for stability for at least 24 hours. The viscosity of the obtained solution was 290 cP. The solids content of the flexible organic binder particles was 11.1%.

[0092] coating:

[0093] A 58cm wide PET non-woven fabric (thickness: 20μm, weight per unit area: 11g / m2) was applied by roller coating method. 2 ) continuously coat the above solution, and then dry it at 120°C. Obtain a weight per unit area of ​​31g / m 2 And impregnated non-woven fabric with a thickness of 34 μm. The average pore diameter is 0.6 μm.

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Abstract

The invention relates to a separator with a main part which is made of nonwoven material, said main part being provided with a coating. The coating contains filler particles, cellulose, and flexible organic binder particles, said filler particles and flexible organic binder particles being connected to each other by the cellulose. The aim of the invention is to design and develop a separator such that said separator exhibits high permeability with increased mechanical stability. The separator is characterized in that the cellulose contains cellulose derivatives that have a chain length of at least 100 repeating units, preferably a chain length of at least 200 repeating units.

Description

technical field [0001] The invention relates to a diaphragm of the type stated in the preamble of patent claim 1 . Background technique [0002] WO 2009 / 033627 A1 already discloses separators of this type which are coated with filler particles and which can be used in lithium-ion batteries or capacitors. [0003] The failure of lithium-ion batteries may have external or internal causes. A faulty battery management system or a failed temperature control are external causes. Internal failures can be caused by battery chemistry, degradation processes, or internal short circuits. [0004] The implementation of the battery can only affect external causes to a limited extent. Internal causes should be reduced or eliminated to enable long-term use of high-capacity Li-ion batteries. [0005] About 90% of cell failures in lithium-ion batteries are caused by internal short circuits. An internal short circuit occurs when one or more electrode particles squeeze through the separato...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/414H01M50/429H01M50/431H01M50/434H01M50/451H01M50/454H01M50/489H01M50/491
CPCY02E60/12H01M2/1686H01M2/1626H01M2/1606H01M2/1646H01M10/052H01M2/162Y02E60/10H01M50/44H01M50/4295H01M50/431H01M50/429H01M50/491H01M50/489H01M50/451H01M50/414H01M50/454H01M50/434H01M50/446H01M50/449
Inventor 迈克尔·罗斯克里斯托弗·韦伯玛吉塔·博格西格莉德·盖格克劳斯·贺恩克里斯蒂安·瓦辛斯基桑德拉·法鲁斯马克西姆·卡赛
Owner CARL FREUDENBERG KG
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