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Separator material and method of producing the same, and alkali secondary battery separator

A separator material, polyolefin technology, applied in the direction of alkaline batteries, battery pack parts, circuits, etc., can solve the problem that non-woven fabrics cannot be uniformly sulfonated

Inactive Publication Date: 2007-10-31
DAIWA BOSEKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sulfonation may not be performed uniformly inside the nonwoven fabric

Method used

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  • Separator material and method of producing the same, and alkali secondary battery separator
  • Separator material and method of producing the same, and alkali secondary battery separator
  • Separator material and method of producing the same, and alkali secondary battery separator

Examples

Experimental program
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Effect test

preparation example Construction

[0063] (2) Preparation of samples

[0064] A 1 g sample was collected from the nonwoven fabric, and the sample was immersed in a 13% potassium hydroxide aqueous solution for 30 minutes. Thereafter, the solution was washed with tap water, followed by purified water for 30 minutes. Thereafter, the sample was dried at 60° C. for 1 hour. The sample was thus prepared.

[0065] (3) Oxygen combustion flask method

[0066] 5 ml of this absorption solution was put into a combustion flask, and its inner wall was wetted with purified water. Next, this sample (20 mg) was weighed into an ashless filter (5C), which was then placed in a platinum basket. The flask was filled with oxygen for 30 seconds. After this, an electric current was passed through the platinum basket to burn the sample. After the combustion, the flask was shaken while occasionally adding purified water to the liquid perfusion portion of the flask, followed by cooling for 5 minutes. After cooling, the inner wall of t...

Embodiment 1

[0119] Fiber 1 (40% by mass), Fiber 5 (40% by mass) and Fiber 7 (20% by mass) were mixed to prepare a water dispersion slurry having a concentration of 0.5% by mass. Fiber 1 was split using a beater, wherein the stirring time was 60 minutes and the stirring speed was 1000 rpm. With the formed water-dispersed slurry, each of the cylinder type wet paper machine and the short line type wet paper machine is used to produce a mass per unit area of ​​35 g / m 2 wet mesh. Combine these wet nets together. Next, the formed web was heat-treated using a cylinder dryer at a temperature of 135° C. and a linear pressure of 40 N / cm. As a result, the fiber 1, fiber 5 and fiber 7 are flattened mainly in the surface layer portion of the nonwoven fabric, while the sheath component of the fiber 5 is melted to bond the component fibers together to obtain a wet web. In the formed wet web, about 60% of the fibers 1 were split to form ultrafine staple fibers.

[0120]Thereafter, columnar spraying a...

Embodiment 2

[0124] A separator material of the present invention was obtained in a manner similar to Example 1, except: using SO 3 Gas handler, at a concentration of 8vol% SO 3 In a gas atmosphere, at a reaction temperature of 60° C. and a reaction time of 90 seconds, the wet-laid nonwoven fabric obtained by performing the spunlace treatment in Example 1 on the wet-laid web was subjected to sulfonation treatment; The sodium oxide solution was neutralized and the nonwoven fabric was washed with hot water at 60° C., and then dried at 70° C. using a magnetic drum dryer; the obtained nonwoven fabric was rolled up using a winder; thus, A sulfonated nonwoven was obtained. In the formed separator material, the ratio of flattened fibers bonded by polyolefin thermally bonded short fibers and constituting the surface layer portion of the nonwoven fabric was larger than that in the interior of the nonwoven fabric.

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Abstract

The separator material of the present invention is a sulfonated non-woven fabric comprising polyolefin ultrafine short fibers with a denier of less than 0.5 dtex and one or more other polyolefin short fibers. The other polyolefin staple fibers include polyolefin thermally bonded staple fibers. At least a portion of the polyolefin thermally bonded staple fibers are flattened to bond the component fibers together. The nonwoven fabric has a specific surface area in the range of 0.6 m2 / g to 1.5 m2 / g and satisfies the following range. (1) The ratio (S / C)E of the number of sulfur atoms (S) to the number of carbon atoms (C) in the non-woven fabric measured by electron spectroscopy (ESCA) for chemical analysis is in the range of 5×10-3-60×10- 3 range. (2) The ratio (S / C)B of the number of sulfur atoms (S) to the number of carbon atoms (C) in the nonwoven fabric measured by the flask combustion technique is in the range of 2.5×10-3-7×10-3. (3) The ratio (S / C)E / (S / C)B (depth of sulfonation) of (S / C)E to (S / C)B is in the range of 1.5-12. Thus, there are provided a separator material having high self-discharge performance when charge and discharge are repeatedly performed, high processability when assembling a storage battery, and high resistance to short-circuit capability; a method of producing the separator; and a An alkaline secondary battery separator.

Description

technical field [0001] The present invention relates to a separator material which is a sulfonated nonwoven fabric comprising polyolefin short fibers and is applied to alkaline secondary batteries, lithium ion secondary batteries, electrochemical devices (e.g., electrical double layer capacitors, capacitors) etc.), ion exchange separators (for example, ion traps, etc.), and the like. Specifically, the present invention relates to a separator material having high self-discharging performance and suitable for alkaline secondary battery applications such as nickel-cadmium batteries, nickel-zinc batteries, nickel-hydrogen batteries, and alkaline secondary battery separators. Background technique [0002] In recent years, nonwoven fabrics made of polyolefin fibers such as polypropylene and the like and subjected to hydrophilic treatment are preferably used as separator materials applied to alkaline secondary batteries and the like. Specifically, a separator material subjected to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16D04H1/54H01M50/417H01M50/489H01M50/494
CPCY02E60/124D04H1/54H01M2/162H01M10/24Y10T428/2964Y10T428/31913Y10T442/692Y10T428/31909Y10T442/698Y02E60/10H01M50/44H01M50/417H01M50/489H01M50/494H01M50/414H01M50/403Y02P70/50
Inventor 山本博之木田达宣上笹利夫
Owner DAIWA BOSEKI KK
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