Preparation method of composite membrane for lithium ion battery

A technology of lithium-ion batteries and composite diaphragms, applied in battery pack parts, chemical instruments and methods, circuits, etc., can solve problems such as internal short circuit of batteries, diaphragm melting, battery fire, etc., and achieve strong mechanical properties, high porosity, The effect of simple production process

Active Publication Date: 2012-04-11
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the battery heats up further, the separator will also melt, causing a large area of ​​internal short circuit in the battery, causing serious safety problems such as fire and explosion of the battery.

Method used

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  • Preparation method of composite membrane for lithium ion battery
  • Preparation method of composite membrane for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A rectangular polypropylene separator 1 with a size of 20 mm × 30 mm and an Al with a diameter of 40 mm 2 o 3 Put the targets into the corresponding positions of the existing magnetron sputtering equipment room, adjust the air pressure of the magnetron sputtering equipment to 0.3Pa, adjust the sputtering power to 35W, and start sputtering. When the sputtering time is 6min, stop the equipment to obtain a single surface with Al 2 o 3 Coat 2 of the diaphragm. After the position of the diaphragm is reversed, the above operation is repeated to obtain a film with Al on both sides. 2 o 3 Coated composite Li-ion battery separator.

Embodiment 2

[0019] A rectangular polyethylene separator 1 with a size of 20 mm × 30 mm and a SiO2 membrane with a diameter of 40 mm 2 Put the targets into the corresponding positions of the existing magnetron sputtering equipment room, then adjust the air pressure of the magnetron sputtering equipment to 0.4Pa, adjust the sputtering power to 40W, and start sputtering. When the sputtering time is 8min, stop the equipment to obtain a single-sided SiO 2 Coat 2 of the diaphragm. Repeat the above operation after inverting the position of the diaphragm to obtain SiO on both sides 2 Coated composite Li-ion battery separator.

Embodiment 3

[0021] A rectangular nonwoven fabric 1 with a size of 22 mm × 25 mm and ZrO with a diameter of 40 mm 2 Put the targets into the corresponding positions of the existing magnetron sputtering equipment room, adjust the air pressure of the magnetron sputtering equipment to 0.25Pa, adjust the sputtering power to 44W, and start sputtering. When the sputtering time is 10min, stop the equipment to obtain a single surface with ZrO 2 Coat 2 of the diaphragm. Repeat the above operation after flipping the position of the diaphragm to get ZrO on both sides 2 Coated composite Li-ion battery separator.

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Abstract

The invention relates to a preparation method of a composite membrane for a lithium ion battery, wherein the composite membrane consists of an inorganic oxide coating and an organic membrane base body. The preparation method is characterized in that the preparation method is a magnetron sputtering method. The preparation method comprises the following steps of: cutting an organic membrane base body material to be rectangular, and putting the rectangular material into a magnetron sputtering cavity; putting an inorganic oxide target material into the magnetron sputtering cavity; adjusting the pneumatic parameter of magnetron sputtering equipment to be 0.1-1.0 Pa, the sputtering power parameter of the magnetron sputtering equipment to be 30-50W, and the sputtering time parameter of the magnetron sputtering equipment to be 1-30 minutes; running the equipment; and sputtering organic oxide at two sides of an organic membrane, so that the composite membrane for the lithium ion battery is prepared. The preparation method is simple in technology, and the membrane is higher in mechanical behavior and porosity; and the membrane for the lithium ion battery prepared by the method not only has a function of interrupting protection but also is very high in safety performance since a melting status can be avoided when the temperature is further risen.

Description

technical field [0001] The invention relates to a preparation method of a composite diaphragm for a lithium ion battery, in particular to a preparation method of a composite diaphragm composed of an inorganic oxide coating and an organic diaphragm matrix. Background technique [0002] Quality and price are the main factors that determine the scope of application of a technology. At present, the price of lithium-ion batteries is still high due to the constraints of raw material costs, and the safety performance needs to be improved urgently. The separator is a very important part of the lithium-ion battery, which has a huge impact on the cost and safety performance of the lithium-ion battery. Therefore, continuous research on new separator materials is of great significance to improve the overall performance of the lithium-ion battery. [0003] The separator should be a good electronic insulator and ion conductor, allowing lithium ions to pass through easily while ensuring t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/04B32B27/00H01M2/16
CPCY02E60/12Y02E60/10
Inventor 姜涛张克金王丹安宇鹏王金兴荣常如魏晓川许德超
Owner CHINA FIRST AUTOMOBILE
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