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Novel high-temperature-resisting diaphragm of lithium battery and preparation process of diaphragm

A lithium battery diaphragm and high temperature resistance technology, applied in lithium batteries, battery pack components, non-aqueous electrolyte batteries, etc., can solve the problems of low closed cell temperature and fusing temperature, and can not meet high temperature resistance.

Active Publication Date: 2014-03-05
QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the continuous development of lithium-ion batteries, especially in power vehicles and large-capacity energy storage batteries, in order to achieve high-rate and rapid discharge, higher requirements are put forward for lithium battery separators. It is hoped that the separators have higher porosity And through holes, and put forward higher requirements for high temperature resistance. In order to ensure safety, lithium battery separators usually require lower closed cell temperature and higher fusing temperature. However, lithium battery separators prepared by wet process are usually The lower closed cell temperature and fusing temperature are both low, which cannot meet the performance of high temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention relates to a method for preparing a novel high-temperature-resistant lithium battery separator, the method comprising the following steps:

[0028] Step 1: batching step: first configure mixture A, which is used as the raw material required for preparing the inner and outer layers of the lithium battery separator of the present invention:

[0029] Weigh 20Kg of UHMWPE powder, weigh 113.3Kg of white oil, pour the white oil and UHMWPE powder into the stirring tank for full stirring, the stirrer is in the form of double ribbons, and obtain the mixture A for later use;

[0030] Configuration mixture B, mixture B is used as the raw material required for preparing the intermediate layer of the lithium battery diaphragm of the present invention:

[0031] Weigh 40Kg of UHMWPE powder, 2Kg of Al2O3 powder, and 226.6Kg of white oil, pour the weighed UHMWPE powder, Al2O3 powder and white oil into the stirring tank for full stirring, and the stirrer is in the f...

example 1

[0032] Step 2: Extrusion and compound molding step: Mixture A passes through a twin-screw extruder with a diameter of 35mm, an aspect ratio of 52, and a temperature of 200°C to obtain a uniform high-temperature melt of mixture A; mixture B passes through a twin-screw extruder with a diameter of 96mm and a length A twin-screw extruder with a diameter ratio of 52 and a temperature of 200° C. obtains a uniform high-temperature melt of mixture B. The two high-temperature melts are respectively passed through a melt pump according to the weight percentage between the three layers in the final diaphragm product. Example 10%: 80%: 10% is accurately measured and enters the three-layer extrusion die for composite molding;

[0033] Step 3: Casting, cooling and shaping Step: The high-temperature melt flowing out of the slit of the die head passes through four chilling rollers with temperatures of 50°C, 40°C, 30°C, and 30°C in turn to obtain the composition A / B / A extruded cast sheet;

...

Embodiment 2

[0040] The difference from Example 1 is:

[0041] Cooling and shaping step in step 3: the high-temperature melt flowing out from the slit of the die passes through a cold water bath to obtain an extruded cast sheet with a composition of A / B / A.

[0042] The lithium battery separator prepared in this example has a fusing temperature of 195° C., which is 60° C. higher than that of a separator made of PE alone.

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PUM

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Abstract

The invention discloses a novel high-temperature-resisting diaphragm of a lithium battery and a preparation process of the diaphragm, which belong to the field of a battery diaphragm, and solve the problem in the prior art that the lithium battery diaphragm which is prepared by adopting a wet-method process is low in fuse temperature. The high-temperature-resisting diaphragm of the lithium battery is prepared by adopting a wet-method process. The diaphragm comprises an inner layer, an intermediate layer and an outer layer, wherein both the inner layer and the outer layer are prepared by adopting polyethylene and white oil as raw materials; the intermediate layer is prepared by adopting polyethylene, white oil and nanometer inorganic oxide as raw materials. The preparation process comprises the following steps of mixing, extrusion, compounding through a die head, casting, cooling and molding, bidirectional synchronous stretching, extraction, drying, transversely stretching and expanding and thermal setting. The fuse temperature of the diaphragm prepared through the process is detected to be 50 to 70 DEG C higher than that of the diaphragm with a single PE (polyethylene) component.

Description

technical field [0001] The invention belongs to the field of battery diaphragms, and in particular relates to a high-temperature-resistant lithium battery diaphragm and a preparation process thereof. Background technique [0002] The separator is one of the important raw materials of the battery. Its function is to separate the positive electrode from the negative electrode material, allow ions to pass through, and prevent electrons from passing through. The performance of the lithium battery separator determines the interface structure and internal resistance of the battery, which directly affects the capacity of the battery. Cycle and safety performance and other characteristics, the separator with excellent performance plays an important role in improving the overall performance of the battery. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B27/32H01M50/403H01M50/443H01M50/446H01M50/457H01M50/489
CPCB32B27/20B32B27/32B32B2457/10H01M10/052H01M50/446Y02E60/10
Inventor 任富忠丁交通王志凯赵建敏姚丽萍郅立鹏陈继朝
Owner QINGDAO LANKETU MEMBRANE MATERIALS CO LTD
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