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Method for preparing lithium battery current collector by plasma spraying polymer composite positive temperature coefficient (PTC) powder

A plasma and polymer technology, which is applied in the field of plasma spraying polymer composite PTC powder to prepare lithium battery current collectors, can solve the problems of difficult control of processing uniformity and restrictions on the application of PTC materials, and solve the problem of excessive current collectors The rapid temperature rise and chain reaction cause combustion and explosion, improve production efficiency and high-quality product rate, and have the effect of accuracy and convenience.

Inactive Publication Date: 2014-05-14
ZHONGYUAN ENGINEERING COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Due to the characteristics of barium titanate ceramic materials, the processing of PTC materials is difficult to control the uniformity of traditional processing, which limits the application of PTC materials.
[0007] Due to the limitations of the traditional preparation of PTC components, PTC components and electrodes are processed separately, and then welded or glued to the plate to form a device, mainly small components, and there is no processing of huge ultra-thin functional lithium battery current collectors. to report

Method used

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  • Method for preparing lithium battery current collector by plasma spraying polymer composite positive temperature coefficient (PTC) powder
  • Method for preparing lithium battery current collector by plasma spraying polymer composite positive temperature coefficient (PTC) powder

Examples

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Embodiment 1

[0024] Such as figure 1 with figure 2 As shown, the method for preparing lithium battery current collectors by plasma spraying polymer composite PTC powder in this example includes the following steps: (1) Take 100 g of polyethylene and 100 g of carbon black, put them into a ball mill under the protection of nitrogen, and mix them by ball milling After 5 hours, the polymer composite PTC powder was prepared; (2) The copper foil with a thickness of 5 μm was released through the unwinding device 1, and the released copper foil was heated to 100 ° C by the heating device 2, and the width was 1.3 meters. On the plasma coating machine 3 with a length of 5 meters, continuously coat 600 meters at a speed of 50 m / min, and control the polymer composite PTC powder coating thickness to 2.5 through the flow control valve 4 provided on the plasma coating machine. μm, cooled and crystallized by the cooling device 5, and then enters the winding device 6 to complete the double-sided plasma s...

Embodiment 2

[0026] In this example, the method of plasma spraying polymer composite PTC powder to prepare a lithium battery current collector includes the following steps: (1) Take 10 g of polypropylene and 100 g of barium titanate micropowder, and put them into a three-screw blending reactor under nitrogen protection (2) Unwind the aluminum foil with a thickness of 3 μm through the unwinding device, and heat the released aluminum foil to 150°C through the heating device. On a 5-meter plasma coating machine, continuously coat 600 meters at a speed of 50 m / min. The coating thickness of the polymer composite PTC powder is controlled by the flow control valve on the plasma coating machine to be 1 μm. Cool and crystallize, and then enter the winding device to complete the electrostatic spraying of the polymer composite PTC powder on the aluminum foil; (3) Take out the aluminum foil roll in the winding device and install it in a 10-meter-long dragon kiln, and then experience 80 ° C, Heating at...

Embodiment 3

[0028]In this embodiment, the method for preparing a lithium battery current collector by plasma spraying polymer composite PTC powder includes the following steps: (1) Take 50 g of polyimide and 100 g of barium titanate micropowder with a lead content of 0.3% by mass, Put it into a three-screw blending reactor under protection, and mix for 5 hours to obtain a polymer composite PTC powder; (2) Release the copper foil with a thickness of 15 μm through the unwinding device, and heat the discharged copper foil through the heating device To 180°C, on a plasma coating machine with a width of 1.3 meters and a length of 5 meters, continuously coat 600 meters at a speed of 50 meters per minute, and control polymer compounding through the flow control valve on the plasma coating machine The PTC powder is coated with a thickness of 2.5 μm, cooled and crystallized by the cooling device, and then enters the winding device to complete the double-sided plasma spraying of the polymer composit...

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Abstract

The invention discloses a method for preparing a lithium battery current collector by plasma spraying polymer composite PTC powder. The method comprises the steps of (1) preparing the polymer composite PTC powder; (2) heating the lithium battery current collector up to 100-300 DEG C by a heating device, and coating the lithium battery current collector with the polymer composite PTC powder obtained in the step (1) through a plasma spraying device to form a polymer composite PTC powder coating on the lithium battery current collector; (3) baking the lithium battery current collector coated with the polymer composite PTC powder coated in the step (2), and carrying out a recrystallization technology to obtain the lithium battery current collector provided with the polymer composite PTC powder coating. Compared with the prior art, the method has the advantages that the processing process is simple and convenient, the production efficiency is improved, the yield is increased, the product thickness consistency is high, the product quality reliability is high, the thermosensitive reaction speed is high, and capacity adjustment is accurate and convenient.

Description

technical field [0001] The invention relates to the field of preparation of lithium battery current collectors, in particular to a method for preparing lithium battery current collectors by plasma spraying polymer composite PTC powder. Background technique [0002] During the application of lithium batteries, when a short circuit occurs inside the battery, such as acupuncture, violent collision, etc., the instantaneous current increases sharply, causing the battery to heat up, which causes a series of chain reactions, and finally causes the lithium battery to catch fire and explode. To deal with this For one phenomenon, some people use PTC sensors to stick on the connection circuit of the battery or the battery shell to prevent it. Since these devices and components are outside the lithium battery, they cannot obtain the internal temperature rise information of the lithium battery in time and respond in time, resulting in preventive measures. Lag, can not meet the purpose of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66
CPCH01M4/0419H01M4/667H01M4/668H01M2200/106Y02E60/10
Inventor 张迎晨张夏楠吴红艳
Owner ZHONGYUAN ENGINEERING COLLEGE
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