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A sulphur-modified polyolefin battery separation film and its making method

A technology of battery diaphragm and sulfonation modification, which is applied to battery components, circuits, electrical components, etc. It can solve the problems of poor oxidation resistance of vinylon, increased battery self-discharge, and poor battery performance, and achieve good hydrophilicity Resistance, strong anti-oxidation ability, and the effect of improving electrical properties

Active Publication Date: 2008-09-17
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, nickel battery separators usually use vinylon separators and polyamide fiber separators with good hydrophilicity. However, vinylon has poor oxidation resistance, which greatly affects the performance of batteries.
The polyamide fiber diaphragm will be hydrolyzed in the alkaline solution to generate impurities such as nitrate ions, nitrite ions, ammonia, etc. The presence of these impurities also leads to an increase in the self-discharge of the battery, and the performance of the battery is significantly deteriorated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] According to methacrylic acid: acrylamide = 1: 0.8, it is prepared into an aqueous solution with a total concentration of 40%. At the same time, copper acetate is added as a polymerization inhibitor, and the concentration of the polymerization inhibitor is 0.4%. Add the proportion of the above reaction liquid, mix the fiber and liquid and the sulfonating agent chlorosulfonic acid, put it into the grafting reactor, and pass high-purity nitrogen gas for 25 minutes. After irradiating with a total amount of 6KGY, the polyolefin fiber obtains lasting hydrophilicity. After the above-mentioned modified fiber is washed, according to the ratio of 60% of grafted modified polyolefin fiber with a length of Slnln, 30% of polypropylene core and polyethylene skin composite fiber with a length of 8mm, and 10% of polymethylmethacrylate , using wet special paper making equipment to copy the separator paper, and undergo appropriate calendering and finishing treatment.

Embodiment 2

[0024] According to methacrylic acid: methacrylamide=1: 1 is mixed with the aqueous solution that total concentration is 50%, adds ferrous sulfate simultaneously as polymerization inhibitor, and polymerization inhibitor concentration is 0.5%, and polypropylene fiber is pressed fiber: Solution = 1:9 ratio was added to the above reaction liquid, and finally the sulfonating agent chlorosulfonic acid was added dropwise, the reaction was complete, and high-purity nitrogen gas was flowed for 30 minutes. After irradiating with a total amount of 7KGY, the polyolefin fiber obtains lasting hydrophilicity. After the above-mentioned modified fibers are washed, the graft modified polyolefin fiber with a length of 2mm is 60%, the polypropylene core with a length of Slnfn, the polyethylene skin composite fiber is 20%, and the proportioning ratio of 20% of acetyl methacrylate , Use the papermaking equipment of Shizhou Temple to copy out the diaphragm paper, and undergo appropriate calendering...

Embodiment 3

[0026] The acrylic acid is formulated into the aqueous solution that concentration is 20%, adds ferrous sulfate, ferric sulfate simultaneously as polymerization inhibitor, and polymerization inhibitor concentration is 0.2%, the composite fiber of polypropylene fiber, polyethylene fiber is pressed this composite fiber: solution= The ratio of 1:10 was added to the above reaction liquid, and finally the sulfonating agent sulfuric acid was added dropwise to complete the reaction. After mixing the fiber and liquid, put it into the grafting reactor, and pass high-purity nitrogen gas for 30 minutes. After the total amount of SKGY is irradiated, the polyolefin fiber can obtain lasting hydrophilicity. After above-mentioned modified fiber is washed, be 60% of the graft modified polyolefin fiber of 6Inln by length, the polypropylene core that length is 6mm, polyethylene sheath composite fiber 35%, the proportioning of carboxymethyl cellulose 5%, The separator paper is produced by wet-lai...

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PUM

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Abstract

The invention discloses a polyolefin battery isolation membrane after lfonation modifying, wherein the weight ratios of raw material of the invention are: 60 to 90 percent of polyethylene or polypropylene fiber, graft monument acrylic acid, meth-acrylic acid, 2 to 10 percent of propylene peptide amine or meth-acrylic peptide amine, 5 to 15 percent of enhanced fiber, 1 to 10 percent of sulfonation agent. The polyolefin after lfonation modifying has good hydrophilicity, strong preserving liquid ability, high alkali uptake rate, good chemical stability and strong anti-oxidation property after washing, and can improve electrical property of nickel battery significantly.

Description

technical field [0001] The invention relates to the technical field of a polyolefin separator for batteries and a preparation method thereof. Background technique [0002] Polymer lithium-ion battery not only has the characteristics of high voltage, high specific energy, long cycle life and clean and pollution-free of liquid lithium-ion battery, but also has flexible shape design and thinner thickness because of its solid structure and flexible packaging. , better security and so on. Polymer lithium-ion batteries have been used in various new mobile phone products, and have become another hot spot in the research of chemical power sources in recent years. The key technology of polymer lithium ion battery is to prepare polymer electrolyte diaphragm. In 1993, Bellcore Corporation of the United States developed a porous polymer electrolyte with high ionic conductivity and good mechanical strength based on vinylidene fluoride and hexafluoropropylene copolymer. However, this pr...

Claims

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Application Information

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IPC IPC(8): H01M2/16D06M14/28D06M11/55D06M13/265D06M101/20H01M50/44H01M50/446
CPCY02E60/10
Inventor 聂君兰
Owner SHENZHEN SENIOR TECH MATERIAL
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