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Preparation process of a new type of high temperature resistant lithium battery separator

A lithium battery separator and preparation process technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor liquid absorption and liquid retention, poor battery acid resistance, high self-discharge rate, and achieve liquid absorption and liquid retention. The effect of increased capacity, extended service life, and reduced self-discharge rate

Active Publication Date: 2016-05-04
JIANGSU ANREDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in order to overcome the problems raised in the above-mentioned background technology, the present invention provides a new high-temperature-resistant lithium battery diaphragm preparation process to solve the problem of lithium battery diaphragm fusing in the current dry process and wet process. Low temperature, poor acid resistance of the battery, low safety, poor liquid absorption and retention capacity, and high self-discharge rate

Method used

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  • Preparation process of a new type of high temperature resistant lithium battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation process of this new type of high-temperature-resistant lithium battery separator adds a nano-oxide coating process and a plasma treatment process on the basis of the traditional dry stretching process. The specific process steps are as follows:

[0018] a. Spraying treatment: The three layers of polypropylene base film are released from their respective unwinding ends 1 and then sent to the corresponding nano-oxide sprayers 2 through the guide rollers, and the three nano-oxide sprayers 2 are respectively applied to the three layers. The polypropylene base film layer is sprayed with nano-oxide, wherein the sprayed nano-oxide solution is a volatile solution;

[0019] b. Plasma treatment: The three-layer polypropylene base film layer after nano-oxide spraying continues to be sent to the corresponding plasma treatment equipment 3 under the action of the guide roller, wherein the treatment time of the plasma treatment is 10s, and the plasma treatment time is 1...

Embodiment 2

[0024] The difference from Example 1 is that the treatment time of the plasma treatment is 35s, the cold drawing temperature of the cold drawing roll 4 is 30°C, the hot drawing temperature of the hot drawing roll 5 is 145°C, and the heat setting temperature of the heat setting roll 6 is It is 180°C, and the draw ratio is 1.5.

[0025] The lithium battery separator prepared in this example has a fusing temperature of 227° C., which is 60° C. higher than that of the pure polypropylene separator.

Embodiment 3

[0027] The difference from Example 1 is that the processing time of the plasma treatment is 60s, the cold drawing temperature of the cold drawing roll 4 is 35°C, the hot drawing temperature of the hot drawing roll 5 is 150°C, and the heat setting temperature of the heat setting roll 6 is It is 190°C, and the draw ratio is 2.0.

[0028] The lithium battery separator prepared in this example has a fusing temperature of 212° C., which is 45° C. higher than that of the pure polypropylene separator.

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Abstract

The invention relates to the technical field of lithium battery diaphragms, and in particular relates to a novel high-temperature-resistant lithium battery diaphragm and a preparation process thereof. The diaphragm comprises an inner layer, an intermediate layer and an outer layer which are respectively subjected to spraying treatment and plasma treatment, wherein both the inner layer and the outer layer are formed by polypropylene based film layers and nanometer inorganic oxides sprayed on the polypropylene based film layers; the intermediate layer is formed by a polypropylene-based film layer and a nanometer aluminium oxide sprayed on the polypropylene-based film layer; and the fusing temperature of the diaphragm is 30-60 DEG C higher than that of a pure polypropylene diaphragm. The preparation process comprises the following concrete processing steps: a. the spraying treatment; b. the plasma treatment; and c. drawing and pore-forming treatment. The processes of the nanometer oxide coating and plasma processing are added on the basis of a traditional dry drawing process; and through the coated nanometer oxides, the high temperature resistance, the acid resistance and the liquid absorbing and retaining capability of the lithium battery diaphragm can be improved by a large margin, the self-discharge rate is reduced and the mechanical property of the diaphragm is improved.

Description

technical field [0001] The invention relates to the technical field of preparation technology of lithium battery diaphragm, in particular to a preparation technology of novel high temperature resistant lithium battery diaphragm. Background technique [0002] Lithium-ion batteries are now more and more widely used in portable electronic devices, power batteries and energy storage batteries and other fields. Separators are an important part of lithium-ion batteries. At present, the diaphragm of lithium-ion batteries is mainly composed of polyethylene and polypropylene alone or in combination. When using traditional olefin diaphragms, due to the phenomenon of overcharging and high-power discharge, the temperature of the local diaphragm will be too high, so that the thermal shrinkage inside the battery will cause short circuit. [0003] With the continuous development of the separator industry, automotive batteries and large-capacity batteries have higher and higher requiremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/16B32B37/00B32B38/18H01M2/16
CPCY02E60/10
Inventor 史新昆杨阳金苗张东晖
Owner JIANGSU ANREDA NEW MATERIAL