A kind of preparation method of lithium battery diaphragm

A lithium battery diaphragm and thick film technology, which is applied in the field of lithium battery diaphragm containing lithium-based montmorillonite and its preparation, can solve the problems of loss of electrical performance, failure to meet electrical performance and safety, and blockage at the same time, and achieve porosity Wide control range, excellent rate charge and discharge performance and safety, uniform pore size effect

Active Publication Date: 2019-04-23
杨晓丽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The requirements for lithium battery separators are also constantly increasing, and traditional polyolefin porous membranes cannot meet the requirements of electrical performance and safety at the same time
At present, many manufacturers and research institutes of lithium battery separators propose to improve the safety of lithium batteries by coating coatings. The mainstream method is to coat a heat-resistant layer on the surface of polyolefin separators, which can be heat-resistant Inorganic substances such as aluminum oxide can also be heat-resistant organic substances, such as aramid fiber, etc., but coating the heat-resistant layer will block the pores of some polyolefin separators, resulting in the loss of electrical properties

Method used

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  • A kind of preparation method of lithium battery diaphragm
  • A kind of preparation method of lithium battery diaphragm
  • A kind of preparation method of lithium battery diaphragm

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preparation example Construction

[0038] 1. Preparation of lithium battery separator

[0039] Such as Figure 1-Figure 3 Shown are the structural diagrams of the vacuum rake dryer for drying lithium-based montmorillonite, the high mixer for premixing materials and the twin-screw extruder for extruding materials provided by the present invention.

[0040] There is a steam jacket 11 on the outer periphery of the cylinder 1 of the vacuum rake dryer. The feed port 2, the vacuum port 21, the temperature detection element and the pressure detection element all pass through the steam jacket 11, and the feed port 2 is located in the cylinder 1. In the middle position of the top, the vacuum port 21 is located at the outer circumference of the feed port 2, the commercially available lithium-based montmorillonite passes through the feed port 2 inside the cylinder 1, and is evenly distributed in the cylinder 1 through the horizontal stirring shaft, and the hot steam flows from the cylinder The steam inlet 3 at the top ...

Embodiment 1

[0046] Composition of lithium montmorillonite with a particle size of 2um and a water content of 8% and antioxidant tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid]pentaerythritol in a weight ratio of 10:0.5 dry powder in figure 2 In the high-mixer shown, under the protection of nitrogen, the rotation speed is 200rpm, mix evenly, the total weight of dry powder is 1kg, divide 25kg white oil with a viscosity of 50Cst at 40℃ into 4 batches and add it to the In the high mixer, mix with the dry powder mixed uniformly in the high mixer. The mixing method is: each time a batch of dry powder is added, it is mixed at 300rpm for 5 minutes, cooled for 10 minutes, and then another batch of pore-forming agent is added until All white oils are evenly mixed with dry powder, and finally a premix with an average particle size of less than 3mm is obtained.

[0047] Transport the premixed material to such as image 3 The first feeding port of the twin-screw extruder shown is loc...

Embodiment 2

[0049] The particle size is 2um water content is 11% lithium base montmorillonite, antioxidant tetrakis-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol according to the ratio of 20:0.5 composition dry powder in figure 2 In the shown high mixer, under the protective effect of nitrogen, mix evenly at a speed of 200rpm, the total weight of dry powder is 2kg, divide 25kg white oil with a viscosity of 50Cst at 40°C into 4 batches and add it to the high In the mixer, mix with the dry powder mixed uniformly in the high mixer. The mixing method is: each time a batch of dry powder is added, it is mixed at 200rpm for 20 minutes, cooled for 10 minutes, and then another batch of pore-forming agent is added until all The white oil is evenly mixed with the dry powder, and finally a premixed material with an average particle size of less than 3mm is obtained.

[0050] Transport the premixed material to such as image 3 The shown twin-screw extruder is located in the ...

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Abstract

The invention provides a lithium battery diaphragm, which comprises: lithium-based montmorillonite and polyolefin resin. The present invention also provides a preparation method of lithium battery diaphragm, dehydrating and pre-mixing lithium-based montmorillonite with liquid materials step by step, extruding with polyolefin resin, and going through the steps of casting, stretching, extraction, drying, etc. Finally, a lithium battery separator is obtained. First, add the premixed material formed by lithium-based montmorillonite and pore-forming agent into the extruder, and add polyolefin resin at 1 / 4-1 / 3 of the extruder to improve the mixing effect of raw materials, and finally A lithium battery separator with a wide porosity control range and uniform pore diameter is obtained. The lithium battery separator prepared by the present invention, the lithium battery prepared from the lithium battery separator with high porosity and low porosity, all have excellent rate charge and discharge performance and safety.

Description

technical field [0001] The invention belongs to the field of lithium battery diaphragms, and relates to a lithium battery diaphragm containing lithium-based montmorillonite and a preparation method thereof. Background technique [0002] In the lithium battery structure, the separator is one of its key internal components. The main function of the separator is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and cause short circuit, and also play the role of electrolyte ion channel. Therefore, the performance of the separator determines the interface structure and internal resistance of the lithium battery, and directly affects the capacity, cycle times, and safety performance of the battery. [0003] Since the electrolyte in the lithium battery structure is an organic system, a separator material resistant to organic solvents is required. At present, high-strength thin-film polyolefin porous membranes are generally u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01M50/403H01M50/446
CPCH01M10/052H01M50/403H01M50/409Y02E60/10
Inventor 杨晓丽
Owner 杨晓丽
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