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Hydrophilic membrane material

A separator material and hydrophilization technology, used in textiles and papermaking, fiber processing, electrical components, etc., can solve the problems of electrochemical instability of wetting agents and unfavorable battery charge-discharge performance.

Inactive Publication Date: 2005-07-27
CARL FREUDENBERG KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sulfonated separator can also be finished with a wetting agent, but the electrochemical instability of the wetting agent has an adverse effect on the charge-discharge performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The rise heights measured as above for the non-fluorinated polyolefin-nonwovens are listed in Table 1.

[0042] Table 1: Rising height of 30% KOH-solutions for non-fluorinated polyolefin-wet nonwovens

[0043] [KOH] Height of Ascent Height of Ascent Height of Ascent

[0044] g / m 2 (mm / 1min) (mm / 5min) (mm / 10min)

[0045]0 0 9 19

[0046] 0.01 8 15 25

[0047] 0.1 10 33 40

[0048] 0.5 17 35 53

[0049] 1.0 24 45 61

Embodiment 2

[0051] The rise heights measured for the fluorinated polyolefin-nonwovens are listed in Table 2.

[0052] Table 2: Rising height of 30% KOH-solutions for fluorinated polyolefin-wet nonwovens

[0053] [KOH] Height of Ascent Height of Ascent Ascent Height

[0054] g / m 2 (mm / 1min) (mm / 5min) (mm / 10min)

[0055] 0 3 26 46

[0056] 0.01 25 50 71

[0057] 0.1 28 53 75

[0058] 0.5 28 58 77

Embodiment 3

[0060] It is known that very dry nonwovens have a strongly reduced wettability. To determine the influence of KOH-impregnation on this property, different non-fluorinated nonwovens were dried in a drying cabinet at 105° C. for 5 hours. The ascent height was measured directly after drying. The measured values ​​are listed in Table 3.

[0061] Table 3: Rising height of 30% KOH-solution for non-fluorinated polyolefin-wet nonwoven after drying at 105°C for 5 hours

[0062] [KOH] Height of Ascent Height of Ascent Ascent Height

[0063] g / m 2 (mm / 1min) (mm / 5min) (mm / 10min)

[0064] 0 0 3 6

[0065] 0.1 7 18 25

[0066] 0.5 10 22 30

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PUM

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Abstract

Hydrophilized separator material of synthetic fibers and / or filaments is impregnated with 0.01-10 g / m2 alkali hydroxide and / or carbonate before use. Independent claims are also included for the following: (1) production of the hydrophilized separator material from synthetic fibers and / or filaments by impregnation with an aqueous solution of alkali hydroxide and / or carbonate and then drying; and (2) alkaline batteries or cells containing the hydrophilized separator material.

Description

technical field [0001] The object of the present invention is a sheet-shaped, flexible, electrolyte-resistant separator material which is rapidly and completely wettable with an aqueous, alkaline electrolyte. In addition, the invention relates to a method for preparing such a membrane material and an alkaline primary cell or battery containing such a membrane material. Background technique [0002] Separators are used in electrochemical energy stores to prevent positive and negative electrodes from contacting and thus avoiding undesired current paths between the electrodes, but do not substantially impede the passage of ions of the electrolyte. The separator material used here must have the following properties. [0003] - durability to the electrolyte (usually a concentrated potassium hydroxide- or sodium hydroxide solution) up to 70° C., [0004] - oxidation resistance, [0005] - smaller ion passage resistance, [0006] - high electron passage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M11/38H01M50/417H01M50/423H01M50/426
CPCY02E60/12H01M2/162Y02E60/10H01M50/44H01M50/417H01M50/423H01M50/426
Inventor C·特劳特曼P·克里泽
Owner CARL FREUDENBERG KG