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Reinforcing material for battery diaphragm

A technology for battery separators and reinforcing materials, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor heat resistance, limited application range, high quantitative and thickness, etc., and achieve improved temperature resistance and chemical stability , Improve safety performance, improve the effect of mechanical isolation function

Active Publication Date: 2017-12-08
LONGPONT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two kinds of film-making materials are polyolefin plastics such as polyethylene and polypropylene, which have poor heat resistance, which seriously affects the application of battery separators in a wider range of fields. With the development of large-capacity batteries such as lithium-ion power batteries , the limitations of temperature resistance and gas permeability of commercial polyolefin separators pose a major threat to the safety performance of batteries
Patent 201010204780.3 "Battery separator based on aramid fiber" introduced a battery separator composed of aramid ultra-short fiber (<1.5mm) and precipitated fiber and its production method, but due to the high quantitative and thickness, the limit its application
Patent 201210425855.X "A high-temperature-resistant polyarylsulfone amide-based lithium-ion battery separator" introduced a battery separator based on polyarylsulfoneamide, but its industrial production was limited due to the use of electrospinning production method limit
Patent 201410372541.7 "High-performance battery separator made of aramid fibers" introduced a battery separator made of poly-p-phenylene terephthalamide as the main material, but added pyridine, esters, potassium dichromate and other substances , which limits its application to
[0004] In summary, the existing aramid battery separator technology obviously has inconvenience and defects in actual use, so it is necessary to improve it

Method used

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  • Reinforcing material for battery diaphragm
  • Reinforcing material for battery diaphragm
  • Reinforcing material for battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0029] [Example 1] Preparation of battery diaphragm reinforcement material

[0030] The composition ratio of the battery diaphragm reinforcing material of the present embodiment is as follows:

[0031] Aramid 1414 fiber (4mm): 55% by mass;

[0032] Aramid 1414 precipitated fiber: 45% by mass;

[0033] The specific preparation method is:

[0034] The aramid 1414 fiber is evacuated by a water conservancy pulper at a mass fraction concentration of 0.25% for later use, and then the aramid 1414 precipitated fiber is evacuated by a water conservancy pulper at a concentration of 2% mass fraction, and is further refined by a disc refiner. Grind to the slurry whose knockability is 70°SR. Then the prepared slurry is mixed evenly with water in the slurry mixing tank according to the above-mentioned ratio. During the papermaking process, polyethylene oxide with a mass fraction of 0.6% is added, and then the cylinder is formed. After wet pressing, drying cylinder Dried, coiled and stor...

Embodiment 2

[0037] [Example 2] Preparation of battery diaphragm reinforcement material

[0038] The composition ratio of the battery diaphragm reinforcing material of the present embodiment is as follows:

[0039] Aramid 1313 fiber (8mm): 65% parts by mass;

[0040] Aramid 1414 precipitated fiber: 35% by mass;

[0041] The specific preparation method is:

[0042] The aramid fiber 1313 fiber is evacuated by a water conservancy pulper at a mass fraction concentration of 0.4% for later use, and then the aramid fiber 1414 precipitated fiber is evacuated by a water conservancy pulper at a concentration of 2% mass fraction, and further refined by a disc refiner. Disc grinding to a slurry with a knockout of 75° SR. Then add water to the prepared slurry according to the above ratio and mix it evenly in the mixing tank. During the papermaking process, add polyethylene oxide with a mass fraction of 0.6%, and then form it into a rotary screen, go through wet pressing, and dry in a drying cylinder...

Embodiment 3

[0046]The composition ratio of the battery diaphragm reinforcing material of the present embodiment is as follows:

[0047] Aramid 1313 fiber (6mm): 75% parts by mass;

[0048] Aramid 1313 precipitated fiber: 25% by mass;

[0049] The specific preparation method is:

[0050] Evacuate the aramid 1313 fiber with a water conservancy pulper at a mass fraction concentration of 0.4% for later use, then evacuate the aramid 1313 precipitated fiber with a water conservancy pulper at a mass fraction concentration of 1.3%, and pass through a disc refiner for further disc refining. Grind to a slurry with a knockout degree of 55°SR. Then add water to the prepared slurry according to the above ratio and mix it evenly in the mixing tank. During the papermaking process, add polyethylene oxide with a mass fraction of 0.6%, and then form it into a rotary screen, go through wet pressing, and dry in a drying cylinder. Coiled and stored in rolls, and then hot-rolled at a high temperature in a h...

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Abstract

The invention provides a battery diaphragm reinforcement material, which is composed of the following components: aramid chopped fiber: 30% to 95% by weight; aramid fibril: 5% to 70% by weight; the aramid The chopped fiber is aramid 1313 fiber or aramid 1414 fiber, the length is 6±3mm, and the fiber fineness is 1.2~3.2dtex; the aramid fibrid fiber is aramid 1313 fibrid fiber or aramid 1414 fibrid fiber , beating degree is 20~85°SR. The material of the invention can be used between various battery separators. Compared with the traditional plastic battery separators used alone, the temperature resistance and chemical stability of the battery separator added with the reinforcing material are improved.

Description

technical field [0001] The invention relates to the field of ion batteries, in particular to a diaphragm reinforcement material for ion batteries. Background technique [0002] Since Sony (SONY) successfully developed lithium batteries in the early 1990s, lithium-ion batteries have developed rapidly due to their excellent electrical properties such as high energy density, long cycle life and high voltage. At present, it has been widely used in the fields of electronic products such as mobile phones, portable computers, cameras, and video cameras, and the field of application is still expanding. Lithium-ion batteries consist of positive and negative electrodes, electrolytes and separators. Among them, the battery separator refers to a layer of diaphragm material between the positive and negative electrodes of the battery. It is a very critical part of the battery and has a direct impact on battery safety and cost. Its main function is to isolate the positive and negative ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/44H01M50/457H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 林德苗毛炜坤肖东华陶琳
Owner LONGPONT