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Polyethylene base film, lithium battery diaphragm slurry and lithium battery diaphragm prepared from polyvinyl base film and lithium battery diaphragm slurry

A technology of polyethylene-based film and lithium battery diaphragm, which is applied in the direction of lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problem of low mechanical strength, and achieve the goal of improving heat resistance, toughness and good mechanical strength Effect

Pending Publication Date: 2021-04-23
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a polyethylene-based film for the technical defect of low mechanical strength of the existing lithium battery separator in the prior art, and to add glass fiber and silane coupling agent in the formula to increase the strength of the polyethylene-based film. mechanical strength

Method used

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  • Polyethylene base film, lithium battery diaphragm slurry and lithium battery diaphragm prepared from polyvinyl base film and lithium battery diaphragm slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A preparation method of polyvinyl film, comprising the following steps:

[0043] Step 1: 25 parts by mass of ultra-high molecular weight polyethylene with a weight average molecular weight of 1 million, 5 parts by mass of glass fiber, 1 part by mass of silane coupling agent, 68 parts by mass of paraffin oil and 2,6-di-tert-butyl-4 - 1 mass part of methyl phenol is heated and stirred to obtain a mixture, the mixing temperature of the mixing tank is 80° C., and then heated and blended by a twin-screw extruder to form a homogeneous blend. The screw speed of the twin-screw extruder is 40 rpm , the extrusion temperature is 180°C. ;

[0044] Step 2: cooling and shaping the homogeneous blend described in step 1 through a casting process to obtain a cast sheet;

[0045] Among them, the obtained high-temperature homogeneous blend is accurately metered by the melt pump and then sent into the die head, and the high-temperature molten body sent into the die head flows out from th...

Embodiment 2

[0055]A lithium battery separator slurry, its raw material formula includes 35 parts by mass of aluminum oxide, polystyrene-butadiene emulsion (Nuo Na Chemical Technology Co., Ltd., model: 9003-55-8 (CAS No.)) 5 parts by mass, 0.08 parts by mass of sodium lauryl sulfate, 0.6 parts by mass of sodium polyacrylate, 8 parts by mass of sodium carboxymethylcellulose, 2 parts by mass of auxiliary agent and 60 parts by mass of deionized water; A blend formed by mixing polyamide and hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS-g-MA), in which polyamide and hydrogenated styrene-butadiene- The mass ratio of the styrene triblock copolymer is 96:4.

[0056] The preparation method of the above-mentioned lithium battery diaphragm slurry comprises the following steps:

[0057] Step 1: Add sodium polyacrylate to deionized water, and disperse for 20 minutes at a speed of 1000r / min to obtain a mixed solution;

[0058] Step 2: adding aluminum oxide and additives to the obtain...

Embodiment 3

[0064] No. 1 lithium battery separator, including the polyethylene base film prepared in Example 1 and the coating formed by the lithium battery separator slurry prepared in Example 2 coated on one side of the polyethylene base film. The thickness of the polyethylene base film is 12 μm, and the coating thickness is 4 μm.

[0065] No. 2 lithium battery separator, including the polyethylene-based film prepared in Comparative Example 1 and the coating formed by the lithium battery separator slurry prepared in Example 2 coated on one side of the polyethylene-based film. The thickness of the polyethylene base film is 12 μm, and the coating thickness is 4 μm.

[0066] No. 3 lithium battery separator, including the polyethylene-based film prepared in Example 1 and the coating formed by the lithium battery separator slurry prepared in Comparative Example 2 coated on one side of the polyethylene-based film. The thickness of the polyethylene base film is 12 μm, and the coating thicknes...

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Abstract

The invention discloses a polyvinyl base film, a lithium battery diaphragm slurry and a lithium battery diaphragm prepared from the polyvinyl base film and the lithium battery diaphragm slurry. A raw material formula of the polyvinyl base film comprises ultra-high molecular weight polyethylene, glass fibers, a silane coupling agent, a pore-forming agent and an antioxidant. The glass fibers and the silane coupling agent are added to the formula to increase the mechanical strength of the polyvinyl base film. The raw material formula of the lithium battery diaphragm slurry comprises a powder material, a binder, a wetting agent, a dispersing agent, a thickening agent, an auxiliary agent and deionized water; and the auxiliary agent is a blend compound of polyamide and a hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS-g-MA). The formula contains the blended compound of polyamide and the hydrogenated styrene-butadiene-styrene triblock copolymer (SEBS-g-MA), so that the heat resistance and low toughness of the diaphragm can be improved. The lithium battery diaphragm prepared by coating the polyethylene base film and the lithium battery diaphragm slurry has better mechanical strength, heat resistance and higher toughness.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a polyethylene-based film, a lithium battery separator slurry and a prepared lithium battery separator. Background technique [0002] Lithium-ion batteries are widely used in the fields of electronic communication, energy storage, and power supply. They are mainly composed of positive electrodes, negative electrodes, electrolytes, and battery separators. Among them, the battery separator is non-conductive and is located between the positive and negative electrodes to prevent positive and negative electrodes. Or short circuit due to contact. There are generally two methods for the preparation of polyolefin separators, wet method and dry method. Since the products obtained by the wet method have excellent properties, most of them are prepared by the wet method. [0003] Mechanical strength is an important parameter of the separator, especially the mechanical str...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/417H01M50/437H01M50/44H01M50/446H01M10/052
CPCH01M10/052Y02E60/10
Inventor 袁海朝徐锋候丹丹马文献
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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